Using the EvoPacT Circuit Breaker

The Schneider Electric brand vacuum interrupters (VI’s), which are mounted vertically on the back side of the circuit breaker frame, perform the circuit breaker interruption (see Typical EvoPacT Circuit Breaker Features). There is one VI for each phase, assembled in an insulation housing and connected to the circuit breaker contact pads. The VI’s consist of a pair of contacts, one movable and one fixed. The VI’s require only a short contact gap for circuit interruption.

The primary connection of the circuit breaker to the associated switchgear is through the six primary high voltage contacts consisting of the runbacks and clusters mounted horizontally at the rear of the circuit breaker (see Typical EvoPacT Circuit Breaker Features).

The EvoPacT circuit breaker uses a stored energy type operating mechanism that is independent of operator input, providing correct opening and closing speeds. It uses charged springs to perform circuit breaker opening and closing functions. It is mounted at the front of the circuit breaker for easy access during inspection and maintenance (see the figure Circuit Breaker Mechanism Area).

Principle of Operation

The closing springs are charged, either manually or using the M1 electrical motor. The energy stored in the closing springs is released using the XF coil or closing push button. As the mechanism closes the circuit breaker, the opening spring is charged using the energy of the closing springs and the circuit breaker is latched closed (I CLOSED). To open the circuit breaker, the opening spring energy must be released; this is accomplished using the opening push button, or MX or MN opening releases.

The mechanical operation counter shows the number of opening/closing cycles performed by the circuit breaker. It is located in the middle of the circuit breaker ARF200 operating mechanism and can be seen through a window in the front cover (see Typical EvoPacT Circuit Breaker Features and Circuit Breaker Mechanism Area). When the customer receives the circuit breaker, the number of cycles will not be zero due to functional tests and controls performed in the factory. Typically, the counter will show approximately 100 cycles.

The closing springs close the circuit breaker when the close (I CLOSE) push button is pressed or when the XF closing release coil is energized (refer to Closing the Circuit Breaker). The closing spring assembly is located to the right of the ARF200 operating mechanism (see Circuit Breaker Mechanism Area). These springs are charged (compressed) either manually with the manual racking/charging handle or electrically by the spring charging motor (refer to Charging the Operating Mechanism).

When control power is applied to the circuit breaker, the spring charging M1 electrical motor is energized. The charging motor turns the gear box gears, which drive the ratchet assembly up and down. The ratchet assembly rotates the drive shaft compressing the closing springs. As the spring loads pass top dead center, the drive shaft rotates a few degrees until the closing latch roller engages the closing latch. The drive shaft can rotate no further; the closing springs are held in this charged position until a closing operation is initiated by the close (I CLOSE) push button or closing release coil.

The opening spring opens the circuit breaker when the open (O OPEN) push button is pressed or the opening coil is energized. The opening spring with an operation damper is located on the left side of the ARF200 operating mechanism behind the auxiliary switch. This spring is compressed whenever the circuit breaker is in the closed position.

DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E, NOM-029-STPS, or CSA Z462 or local equivalent. Installation, repair, and maintenance work on the circuit breaker must only be carried out by qualified personnel. Failure to follow these instructions will result in death or serious injury.

The ARF200 operating mechanism has indicators visible through two windows on the front cover of the circuit breaker (see Typical EvoPacT Circuit Breaker Features and Circuit Breaker Mechanism Area). The open (O OPEN)-closed (I CLOSED) indicators show whether the vacuum bottle interrupter main contacts are open or closed. The charged-discharged indicator shows whether the circuit breaker closing spring is charged or discharged. Refer to the table below for more details.

Circuit Breaker Indicators		Electrical State	State Description	Command Available
Main Contacts Position Indicator	Spring Charged Status And “Ready to Close” Indicator
			Circuit breaker is open (O OPEN) and operating mechanism is discharged.	Charging the operating mechanism (refer to Charging the Operating Mechanism)
			Circuit breaker is open (O OPEN) with operating mechanism charged.	Closing of the circuit breaker (refer to Closing the Circuit Breaker)
			Circuit breaker is closed (I CLOSED) and operating mechanism is discharged.	Charging the operating mechanism (refer to Charging the Operating Mechanism) Opening the circuit breaker (refer to Opening the Circuit Breaker)
			Circuit breaker is closed (I CLOSED) and operating mechanism is charged.	Opening the circuit breaker (refer to Opening the Circuit Breaker) Operation sequence OPEN - CLOSE - OPEN (refer to OPEN – CLOSE – OPEN without the M1 Electrical Motor or with the M1 Electrical Motor Not Energized)

Circuit breaker operations can be mechanically controlled on the circuit breaker or electrically controlled by using the control devices on the switchgear front panels.

Mechanical control

A mechanical operation on the circuit breaker allows the user to: store the energy required to open or close the circuit breaker; the racking/charging handle enables the manual charging of this mechanism. control the state of the circuit breaker (open (O OPEN) or closed (I CLOSED)) with the push buttons located on the front face of the circuit breaker. A mechanical operation on the racking mechansim allows the user to: perform circuit breaker racking in/racking out operate the red racking/emergency trip push button of the racking mechansim.

Electrical Control

In order to use the electrical control functions, either local or remote, the electrical auxiliary controls must be installed.

The table below shows the possible configurations for electrical control of the circuit breaker.

Refer to the switchgear documentation to find out where the circuit breaker control buttons are located.

Remote electrical control allows the user to perform circuit breaker operations at a distance. To use the electrical control functions, the electrical auxiliary controls must be installed (see the Electrical Control table in the Local Control section).

Refer to the switchgear documentation to find out the available communication functions.

Manual Charging

WARNING
excessive torque applied to equipment Do not charge the ARF200 operating mechanism using a power drill. Failure to follow these instructions can result in death, serious injury, or equipment damage.

Perform the following steps to manually charge the operation mechanism:

1. Move the circuit breaker into a “ready to close” position by checking that the circuit breaker is in the test/disconnected position.

   NOTE: The circuit breaker can be charged if it is in either the open (O OPEN) or closed (I CLOSED) state.

2. Insert the racking/charging handle into the opening for tensioning the operation mechanism.

3. Rotate the racking/charging handle clockwise to charge the operation mechanism as illustrated. (The effective rotation angle is 180°.) Charging should take approximately 12 full rotations of the handle. As soon as the mechanism is fully charged, the operation mechanism is uncoupled and the status indicator signals “Charged/OK”. Rotating the handle further will not damage the mechanism.

4. Remove the racking/charging handle.

5. The circuit breaker is ready for closing.

Mechanism status indicator signaling it is “charged” and that the circuit breaker can be closed (I CLOSED).

Automatic Charging by the M1 Electrical Motor

The ARF200 operating mechanism of motorized circuit breakers is charged automatically as soon as the auxiliary voltage is applied by the closing of the S2 spring charge indication limit switch (refer to The Circuit Breaker Indicators, and S2 “Spring Charge Indication” Contact for more information). The spring charging assembly is located on the left side of the ARF200 operating mechanism (see the figure Circuit Breaker Mechanism Area). If the spring charge motor is supplied with an adequate power supply, the mechanism is automatically charged each time the circuit breaker completes a close operation (refer to Typical Circuit Breaker Electrical Schematic for further details).

When energized by the closing of the S2 limit switch, the M1 spring charging motor drives a series of connected gears which, in turn, operate the ratchet assembly to rotate the drive shaft. As the drive shaft rotates, the closing springs compress to the charged position. When the closing springs are fully charged, the S2 limit switch contacts reopen, de-energizing the M1 spring charging motor.

The circuit breaker closing spring charged status indication is provided both mechanically by a mechanical indicator through a window on the front cover of the circuit breaker (see The Circuit Breaker Indicators) and electrically by a changeover limit switch (S2). The S2 limit switch assembly is located on the lower right side of the ARF200 operating mechanism (see the figure Circuit Breaker Mechanism Area). The limit switch contact is internally wired to the spring charging M1 electrical motor and energizes the motor as soon as the spring is discharged in order to provide quick recharging for reclosing operations (refer to Typical Circuit Breaker Electrical Schematic for further details). The motor limit switch de-energizes the spring charging motor when the closing springs reach the fully charged position. One additional contact is also wired to the “ready to close” indication of the breaker (refer to “Ready to Close” Indication for further information).

The presence of an active trip signal on the circuit breaker is provided by a changeover limit switch (S4) (refer to Typical Circuit Breaker Electrical Schematic for further details). It is located on the upper left side of the ARF200 operating mechanism behind the auxiliary switch. It is wired to the “ready to close” indication of the breaker (refer to “Ready to Close” Indication for further information).

DANGER
anti-pump loss Do not wire the ready to close indication in series to the closing release XF. Failure to follow these instructions will result in death or serious injury.

In order to execute a closing operation using the closing (I CLOSE) push button or the XF closing release coil, the following conditions must be satisfied:

1. The circuit breaker contacts are in the open (O OPEN) position (electrical indication provided by the circuit breaker auxiliary switch, S11)

2. The closing spring of the circuit breaker mechanism is charged (electrical indication provided by the spring charge limit switch, S2)

3. No trip signal is applied to the circuit breaker ARF200 operating mechanism via the opening (O OPEN) push button, the red racking/emergency trip push button, or any of the opening releases (MX1, MX2, and MN) (electrical indication provided by trip half-moon limit switch, S4)

4. The close signal that caused the previous circuit breaker closing operation has been reset.

5. The circuit breaker is not in the transport position.

When these five conditions occur simultaneously, the circuit breaker is in a "ready to close" state.

The EvoPacT circuit breaker is provided with electrical indication of the “Ready To Close” conditions. Three internally wired switchcover contacts, each indicating one of the aforementioned conditions, are connected in series and wired to two pins of the secondary disconnect plug for circuit breaker power and control (refer to Typical Circuit Breaker Electrical Schematic) for further details.

Electrical continuity is only provided between the two secondary disconnect plug pins if all conditions required to execute a closing operation are met. This feature may be used to indicate to external devices that the breaker is ready to be successfully closed.

Do not wire the ready to close indication in series to the closing release XF. Doing so would defeat the mechanical anti-pumping function of the breaker mechanism (refer to Anti-Pump Function) for further information.

Closing Conditions

To close the circuit breaker, the circuit breaker must be in the "ready to close" state, established by simultaneously fulfilling the following conditions:

• circuit breaker is open (O OPEN)

  

• circuit breaker mechanism closing spring is charged as shown by the spring charged status/"ready to close" indicator

  

• no opening order is activated by:

  • an opening release (MX1, MX2, or by optional MN)

  • an ongoing mechanical open operation (i.e. either the open (O OPEN) pushbutton or the red racking/emergency trip push button pushed in)

Manual Closing (local)

After the circuit breaker is in the “ready to close” state, to perform a manual closing of the circuit breaker primary contacts, push the closing (I CLOSE) push button.

The circuit breaker indicators move to the closed (I CLOSED) state and the spring charged status/“ready to close” indicator goes to the discharged state shown below.

If the M1 electrical motor for electrical charging is energized, the closing mechanism is automatically charged (< 7 seconds at rated control voltage) and the circuit breaker indicators will move to the state shown below.

Local

XF Closing Release Coil

Refer to the switchgear documentation or customer order drawings to find out where the circuit breaker closing push button or breaker control switch is located.

Remote

Connect the remote control device to the XF closing release.

Refer to the switchgear factory drawings for the remote closing connection provisions.

Opening Conditions

The opening order has priority over any other command.

Manual Opening (local)

To perform a manual opening (O OPEN) of the circuit breaker primary contacts, push the opening push button located directly on the circuit breaker operating interface.

In emergency situations, the red racking/emergency trip push button on the racking mechanism can also be used to trip open the circuit breaker (see the figures in the Red Racking/Emergency Trip Push Button section).

With the circuit breaker closing springs not charged prior to the open (O OPEN) operation, the circuit breaker contact position indicator moves to the open (O OPEN) state and the spring charged status/"ready to close" indicator remains in the discharged state as they are shown below.

With the circuit breaker closing springs charged prior to the open (O OPEN) operation, whether by a manual charging operation or an energized M1 electrical motor, the circuit breaker contact position indicator moves to the open (O OPEN) state and the spring charged status/"ready to close" indicator remains in the charged state as they are shown below.

Opening by Electrical Control

The circuit breaker can be electrically opened using the following auxiliaries (refer to Circuit Breaker Open and Close Coils and Typical Circuit Breaker Electrical Schematic for further details):

• MX1: opening release

• MX2: secondary opening release

• MN: under-voltage opening release

MX1 Opening Release Coil

MX2, MN Opening Release Coils

Local

Refer to the switchgear documentation or customer order drawings to find where the circuit breaker opening push button or breaker control switch is located.

Remote

Connect the remote control devices to the opening releases of the circuit breaker. Refer to the switchgear factory drawings for the remote opening connection provisions.

The MN under-voltage opening release coil provides a means for opening the circuit breaker upon auxiliary control power loss (refer to Circuit Breaker Open and Close Coils, for further information on the MN and other release coils). It is located in the typical coil mounting location on the top center of the ARF200 operating mechanism (see Circuit Breaker Mechanism Area).

When the MN under-voltage opening release is not energized, it provides a latched opening signal to the circuit breaker. The circuit breaker will immediately open and stay in the open position until:

1. the MN under-voltage release is energized and

2. a close command is applied to the breaker

For commissioning and testing of a circuit breaker equipped with a MN under-voltage opening release, ensure control power is applied across the release terminals in order to allow for circuit breaker closing operations.

Refer to Typical Circuit Breaker Electrical Schematic and the switchgear factory drawings to identify the MN under-voltage opening release connection points to its power supply.

WARNING
STORED MECHANICAL ENERGY Prior to withdrawing a circuit breaker without an electrical charging motor from the compartment, use the circuit breaker push buttons to perform a manual OPEN - CLOSE - OPEN operation to discharge the stored energy in the mechanism. Failure to follow these instructions can result in death, serious injury, or equipment damage.

Manually charging the closing springs after the circuit breaker is closed (I CLOSED) will create the initial state of the circuit breaker shown below. From this initial state, the circuit breaker mechanism can perform an OPEN-CLOSE-OPEN operation sequence. The sequence speed is defined according to the application of the customer and is controlled manually or by the protection, control, and monitoring system.

Initial state of the circuit breaker:

Perform an OPEN - CLOSE - OPEN operation sequence using either the opening (O OPEN) and closing (I CLOSE) push buttons on the circuit breaker or the electrical controls.

The circuit breaker state indicators will move in the following sequence:

After the first open (O OPEN) operation of the circuit breaker

After the close (I CLOSE) operation of the circuit breaker

After the second open (O OPEN) operation of the circuit breaker

The locking tabs allow the locking of the circuit breaker inside the circuit breaker compartment.

In the normal operation position (without any manual action on the locking handles), the locking tabs are out.

To unlock the circuit breaker, manually push the locking handles to retract the locking tabs.

When the circuit breaker is in the transport or connected positions, the locking tabs are blocked and cannot be operated.

The racking-in and racking-out operations can be done manually using the genuine Square D™ brand circuit breaker racking/charging handle supplied by Schneider Electric or remotely if the racking mechanism is equipped with a motor option.

The motor is mounted at the rear of the circuit breaker racking mechanism and it is electrically connected to switchgear low voltage instrumentation and controls via the low voltage plug for additional features on the circuit breaker.

The racking motor is a DC permanent magnet machine and it racks the circuit breaker in toward the connected position if the positive side of its power supply is connected to its red lead and racks the circuit breaker out towards the test/disconnected position if the positive side of its power supply is connected to its black lead.

Electrical limit switches are provided within the circuit breaker assembly to provide indication of the breaker position and of the locking status of the emergency trip pushbutton. Refer to Motorized Racking Mechanism Option — Electrical Schematic, in this user guide, for further information.

DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E, NOM-029-STPS or CSA Z462 or local equivalent. Failure to follow these instructions will result in death or serious injury.

The secondary disconnect plug for circuit breaker power and control, located on the center, top of the circuit breaker:

• automatically connects with the secondary disconnect receptacle in the circuit breaker compartment when the circuit breaker is racked in and reaches the connected position.

• automatically disconnects from the secondary disconnect receptacle in the circuit breaker compartment when the circuit breaker is racked out of the connected position towards the test/disconnected position.

• may not be disconnected from the circuit breaker compartment secondary disconnect receptacle when the circuit breaker is in the connected position.

• may be connected to the circuit breaker compartment secondary receptacle when the circuit breaker is in the test/disconnected position, providing a convenient method to test the circuit breaker electrical control.

To test the circuit breaker in the test/disconnected position:

1. With the circuit breaker compartment door open, locate the handle attached to the secondary disconnect power and control receptacle (see Typical Circuit Breaker Compartment Secondary Disconnect Receptacle Assembly). It is above the circuit breaker in the circuit breaker compartment.

2. Rotate the handle downward, in a clockwise direction to an angle of approximately 60–90 degrees.

3. Pull the handle of the top secondary disconnect receptacle forward until it mates with the secondary disconnect plug on the circuit breaker. The circuit breaker can now be electrically operated in the same way it can when in the connected position.

   NOTE: If the control circuit is energized and the closing spring is discharged, this connection immediately activates the spring charging motor inside the circuit breaker.

4. Push the close (I CLOSE) push button. If the spring charging motor was correctly activated by the control circuit, the close (I CLOSE) push button should release the closing latch, allowing the closing spring assembly to discharge. The closing spring assembly operates the mechanism which is connected to the vacuum interrupters, and closes the vacuum interrupter contacts. The spring charge motor M1 should start and recharge the closing spring assembly immediately after the closing operation.

5. Push the open (O OPEN) push button. If the opening spring assembly was correctly charged (compressed) by the closing operation, the mechanism will release the opening latch and allow the opening spring assembly to discharge. The opening spring assembly operates the mechanism which is connected to the vacuum interrupters, which opens the vacuum interrupter contacts.

6. In this position, it is possible to verify the circuit breaker electrical controls and indications such as the opening and closing releases, spring charge, breaker auxiliary contact status, and ready to close indication. After all the required checks are completed, manually push the receptacle back to its service position using the secondary disconnect receptacle handle. As the secondary disconnect receptacle is moved backwards, allow the handle to rotate clockwise while continuing to push the handle until feeling it snap into the latched position. The secondary disconnect receptacle should be put into this position before racking circuit breakers into the connected position to allow closing of the circuit breaker compartment door prior to the racking operation.

Typical Circuit Breaker Compartment Secondary Disconnect Receptacle Assembly

	Circuit breaker compartment secondary disconnect label		Instruction label		Guide pin
	Secondary disconnect receptacle handle		Secondary disconnect receptacle for circuit breaker power and control

NOTE: When not used for testing the circuit breaker in the test position, the receptacle should remain latched, at the back of its travel in the location where it connects with the circuit breaker plug in the racked-in, connected position. If the receptacle is not in the latched position, then the handle should be used to manually push the receptacle back to the latched, circuit breaker racked-in position before the circuit breaker is racked-in.

DANGER

hazard of electric shock, explosion, or arc flash Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E, NOM-029-STPS, or CSA Z462 or local equivalent. Perform all insertions and removals of the circuit breaker with the entire switchgear line-up de-energized. Ensure the left and right lifting eyes on the sides of the circuit breaker have been removed (if the circuit breaker did not come installed in the switchgear). Verify the nameplate data is compatible with that of the electrical installation. Verify the circuit breaker is installed into the proper circuit breaker compartment by checking the customer order drawings and the nameplates, comparing the secondary disconnect labels on the circuit breaker and the circuit breaker compartment, and checking the mimic diagram (if equipped) on the front of the section. Check the correct operation of the MX, XF, and MN auxiliary releases. Failure to follow these instructions will result in death or serious injury.

WARNING
LIFT TRUCK TIPPING Use only a SureSeT lift truck to insert and remove the EvoPacT MV circuit breaker into / from SureSeT switchgear. Failure to follow these instructions can result in death, serious injury, or equipment damage.

To enable circuit breaker removal from or insertion into the switchgear circuit breaker compartment during the installation or maintenance phases, Schneider Electric recommends the use of a lift truck designed to carry the circuit breaker, lock in position at the different insertion points, and adapt to the specific equipment configuration. Circuit breakers used in Schneider Electric SureSeT Switchgear must use its dedicated lift truck manufactured by Schneider Electric. Refer to Schneider Electric user guide NNZ9886800, SureSeT™ MV Metal-Clad, Indoor Switchgear, for further information on obtaining or using the SureSeT lift truck to remove the circuit breaker from or insert it into the circuit breaker compartment.

DANGER

hazard of electric shock, explosion, or arc flash Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E, NOM-029-STPS, or CSA Z462 or local equivalent. Always keep the circuit breaker compartment door closed when racking the circuit breaker from one position to another. Failure to follow these instructions will result in death or serious injury.

WARNING
EXCESSIVE FORCE APPLIED TO EQUIPMENT Never force the circuit breaker out of the circuit breaker compartment. If a racking mechanism is not operating easily, inspect the equipment and remove any foreign objects or debris from inside the circuit breaker compartment. Failure to follow these instructions can result in death, serious injury, or equipment damage.

CAUTION
INAPPROPRIATE RACKING/CHARGING HANDLE Useage Only operate the racking mechanism with a genuine Schneider Electric racking/charging handle. Do not attempt to insert the circuit breaker racking/charging handle into the racking mechanism racking hole while the motor of the racking mechanism is operating. Failure to follow these instructions can result in injury or equipment damage.

NOTICE
EXCESSIVE ROTATION SPEED For a motorized racking mechanism, don’t exceed 120 rev/min when racking in or racking out the circuit breaker in manual mode. Failure to follow these instructions can result in equipment damage.

Perform the following steps to manually rack out the circuit breaker:

1. Verify the racking position indicator label displays the symbol for the “connected” position.

2. Ensure the circuit breaker compartment door is closed and properly latched per the switchgear instructions.

3. If there is a padlock on the red racking/emergency trip push button of the racking mechanism, remove it.

   

4. If the circuit breaker is in the closed (I CLOSED) position, electrically open it.

   

5. If there is an electromagnet interlock with the racking mechanism, ensure it is energized to allow the racking operation.

   

6. Push and hold the red racking/emergency trip push button on the racking mechanism to free the hole for racking handle insertion, then insert the racking/charging handle.

   NOTE: In case the circuit breaker is in the closed (I CLOSED) position, pushing the red racking/emergency trip push button will result in a circuit breaker opening operation. This action will also prevent the racking motor from starting on circuit breakers equipped with motorized racking systems.
   

7. Rotate the racking/charging handle counter-clockwise until the racking mechanism state indicator moves to the Test/Disconnected position, as shown below.

   NOTE: When the racking position indicator symbol displays the image for “test/disconnected,” the circuit breaker is fully racked out in the circuit breaker compartment and the primary high voltage contacts of the circuit breaker are disconnected.
   NOTE: Interlocks, integrated into the circuit breaker, ensure the circuit breaker primary contacts are in the open (O OPEN) position prior to moving the circuit breaker from the connected or test/disconnected position and ensure the circuit breaker primary contacts remain open (O OPEN) while the circuit breaker is moving in the transport position.
   

   Circuit Breaker Stroke	Number of Racking/Charging Handle Turns
   9.875 in. / 250.8 mm	41

8. Remove the racking/charging handle. The circuit breaker is now in the "test/disconnected" position and can either be operated for test operations, withdrawn from the circuit breaker compartment, or racked back into the connected position (refer to Understanding the Racking Mechanism Controls and Indicators for further information).

   NOTE: The racking/charging handle can be extracted from the racking port at any time prior to the end of the racking out operation, but this action stops the operation. Operation can be resumed by reinserting the racking/charging handle after pushing and holding the red racking/emergency trip push button on the racking mechanism.
   

DANGER

hazard of electric shock, explosion, or arc flash Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E, NOM-029-STPS, or CSA Z462 or local equivalent. Always keep the circuit breaker compartment door closed when racking the circuit breaker from one position to another. Verify the nameplate data is compatible with that of the electrical installation. Verify the circuit breaker is installed into the proper circuit breaker compartment by checking the customer order drawings and the nameplates, comparing the secondary disconnect labels on the circuit breaker and the circuit breaker compartment, and checking the mimic diagram (if equipped) on the front of the section. It is responsibility of the switchgear manufacturer to ensure that proper interlocking is applied to the circuit breaker racking mechanism motor control circuit. Failure to follow these instructions will result in death or serious injury.

CAUTION
UNEXPECTED EQUIPMENT OPERATION Remove the racking/charging handle to allow racking in / racking out operations with racking mechanism motor control. Do not attempt to insert the circuit breaker racking/charging handle into the racking mechanism racking hole while the motor of the racking mechanism is operating. Failure to follow these instructions can result in injury or equipment damage.

Rack-in operations may be performed electrically in circuit breakers equipped with an optional racking mechanism motor.

The control circuit of the circuit breaker racking mechanism motor is located in the switchgear control cabinet and may differ according to the switchgear type and its manufacturer. Indication contacts are provided within the circuit breaker assembly and connected to the LV plug for additional features to be used in the racking motor control circuit that shall provide start, stop, motor protection, and interlocking functions.

It is responsibility of the switchgear manufacturer to ensure that proper interlocking is applied to the racking mechanism motor.

The following interlocking condition must be provided as a minimum:

• The racking mechanism motor operation is prevented unless the circuit breaker is in the open (O OPEN) position.

• The racking mechanism motor operation is prevented in case a manual operation is ongoing or the racking/charging handle is inserted in its port.

• The racking mechanism motor operation is prevented in case a locking condition (such as key lock or padlock activation) is applied.

• In case the racking mechanism locking electromagnet is supplied, the racking mechanism motor operation is prevented in case the magnet is not powered on. The electromagnet indication contact shall be used for this interlocking function.

• Power to the racking mechanism motor is shut down if a peak current or time of transport is exceeded in cases where an object is impeding the racking.

  NOTE: If this situation occurs, inspect the equipment for correct functionality and/or remove any foreign objects or debris from inside the circuit breaker compartment.

Perform the following steps to remotely rack in the circuit breaker:

1. Check the customer order drawings and the nameplates on the circuit breaker compartment to verify the circuit breaker is installed in the proper circuit breaker compartment.

2. Verify the racking position indicator label displays the symbol for the “test/ disconnected” position.

3. If there is a padlock on the red racking/emergency trip push button of the racking mechanism, remove it.

   

4. Open the circuit breaker compartment door. Electrically or mechanically open the circuit breaker and if there is a lock-out / tag-out padlock on the circuit breaker compartment, remove it and unlock the key lock (if equipped) to allow racking. (Refer to Schneider Electric user guide NNZ9886800EN, SureSeT™ MV Metal-Clad, Indoor Switchgear, for further information.)

   

5. Verify the secondary disconnect plug for circuit breaker power and control is in its service position. If it is not, move it back to the service position. (Refer to Secondary Disconnect Plug for Circuit Breaker Power and
   Control — Operation and Testing the Circuit Breaker in the Test/Disconnected Position for further information.)

6. Close and properly latch the circuit breaker compartment door per the switchgear instructions.

7. If there is an electromagnet interlock with the racking mechanism, ensure it is energized to allow the racking operation.

   

8. Launch an electrical rack-in operation from the switchgear front panel or via a remote control system. The motor should operate the racking mechanism until the circuit breaker reaches the connected position. The circuit breaker is now in the "connected" position and can either be operated for normal service or racked back to the test/disconnected position (refer to Understanding the Racking Mechanism Controls and Indicators for further information).

   NOTE: When the racking position indicator symbol displays the image for “connected,” the circuit breaker is fully racked into the circuit breaker compartment and the primary high voltage contacts of the circuit breaker are connected.
   NOTE: Interlocks, integrated into the circuit breaker, ensure the circuit breaker primary contacts are in the open (O OPEN) position prior to moving the circuit breaker from the connected or test/disconnected position and ensure the circuit breaker primary contacts remain open (O OPEN) while the circuit breaker is moving in the transport position.
   

   Circuit Breaker Stroke	Duration
   9.875 in. / 250.8 mm	< 60 s at rated control voltage

DANGER

hazard of electric shock, explosion, or arc flash Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E, NOM-029-STPS-2011, or CSA Z462 or local equivalent. Always keep the circuit breaker compartment door closed when racking the circuit breaker from one position to another. It is responsibility of the switchgear manufacturer to ensure that proper interlocking is applied to the circuit breaker racking mechanism motor control circuit. Failure to follow these instructions will result in death or serious injury.

CAUTION
UNEXPECTED EQUIPMENT OPERATION Remove the racking/charging handle to allow racking in / racking out operations with the racking device motor control. Do not attempt to insert the circuit breaker racking/charging handle into the racking mechanism racking hole while the motor of the racking mechanism is operating. Failure to follow these instructions can result in injury or equipment damage.

Rack-out operations may be performed electrically in circuit breakers equipped with an optional racking mechanism motor.

The control circuit of the circuit breaker racking mechanism motor is located in the switchgear control cabinet and may differ according to the switchgear type and its manufacturer. Indication contacts are provided within the circuit breaker assembly and connected to the LV plug for additional features to be used in the racking motor control circuit that shall provide start, stop, motor protection, and interlocking functions.

It is responsibility of the switchgear manufacturer to ensure that proper interlocking is applied to the racking mechanism motor.

The following interlocking condition must be provided as a minimum:

• The racking mechanism motor operation is prevented unless the circuit breaker is in the open (O OPEN) position.

• The racking mechanism motor operation is prevented in case a manual operation is ongoing or the racking/charging handle is inserted in its port.

• The racking mechanism motor operation is prevented in case a locking condition (such as key lock or padlock activation) is applied.

• In case the electromagnetic interlocking of the racking mechanism is supplied, the racking mechanism motor operation is prevented in case the electromagnet is not powered on. The electromagnet indication contact shall be used for this interlocking function.

• Power to the racking mechanism motor is shut down if a peak current or time of transport is exceeded in cases where an object is impeding the racking.

  NOTE: If this situation occurs, inspect the equipment for correct functionality and/or remove any foreign objects or debris from inside the circuit breaker compartment.

Perform the following steps to remotely rack out the circuit breaker:

1. Verify the racking position indicator label displays the symbol for the “connected” position.

2. Ensure the circuit breaker compartment door is closed and properly latched per the switchgear instructions.

3. If there is a padlock on the red racking/emergency trip push button of the racking mechanism, remove it.

   

4. If the circuit breaker is in the closed (I CLOSED) position, electrically open it.

   

5. If there is an electromagnet interlock with the racking mechanism, ensure it is energized to allow the racking operation.

   

6. Launch an electrical rack-out operation from the switchgear front panel or via a remote control system. The motor should operate the racking mechanism until the circuit breaker reaches the test/disconnected position. The circuit breaker is now in the "test/disconnected" position and can either be operated for test operations, withdrawn from the circuit breaker compartment, or racked back into the connected position (refer to Understanding the Racking Mechanism Controls and Indicators for further information).

   NOTE: When the racking position indicator symbol displays the image for “test/disconnected,” the circuit breaker is fully racked out in the circuit breaker compartment and the primary high voltage contacts of the circuit breaker are disconnected.
   NOTE: Interlocks, integrated into the circuit breaker, ensure the circuit breaker primary contacts are in the open (O OPEN) position prior to moving the circuit breaker from the connected or test/disconnected position and ensure the circuit breaker primary contacts remain open (O OPEN) while the circuit breaker is moving in the transport position.
   

   Circuit Breaker Stroke	Duration
   9.875 in. / 250.8 mm	< 60 s at rated control voltage

Manual and electrical circuit breaker racking operations may be prevented if the optional electromagnetic interlock of the racking mechanism is provided.

The electromagnet assembly is composed of an electromechanical coil, mechanical linkages, and an indication contact that is closed when the coil is energized and open when the coil is not energized. The assembly for the electromagnetic interlocking of the racking mechanism is located on the bottom left side of the mechanism area (see the figure Circuit Breaker Mechanism Area).

When the electromagnet is energized, the red racking/emergency trip push button may be pushed allowing a manual racking operation. When the electromagnet is not energized the red racking/emergency trip push button cannot be pushed, so a manual racking operation may not be performed.

Electrical racking is prevented by the usage of the electromagnet assembly indication contact which shall be used in the racking mechanism motor control circuit in the LV cabinet to prevent the racking motor from running if the electromagnet is not energized.

Locked When the coil is NOT energized: the red racking/emergency trip push button is blocked, preventing pushing it. the hole for racking handle insertion is blocked, preventing insertion of the racking/charging handle. no manual or electrical racking in or out of the circuit breaker is permitted.

Unlocked When the coil is energized: the red racking/emergency trip push button is not blocked the hole for racking handle insertion can open normal racking of the circuit breaker is permitted

DANGER

hazard of electric shock, explosion, or arc flash Always practice lock-out/tag-out procedures according to OSHA requirements. Use out-of-service tags and padlocks when working on equipment. Leave tags in place until the work is completed and the equipment is ready to be put back into service. Do not use locking the red racking/emergency trip push button as a means to lock-out/tag-out a circuit breaker compartment. The switchgear manufacturer must wire the controls properly to interlock electrical motorized racking with the locking of the racking mechanism red racking/emergency trip push button. Failure to follow these instructions will result in death or serious injury.

The racking mechanism can be locked in the connected or test/disconnected position by pulling out the red racking/emergency trip push button and then placing a padlock or a multiple locking hasp system, with one or several padlocks, in the provided hole. Padlocks or lockout hasps are not supplied.

When the red racking/emergency trip push button is locked:

• manual racking in or racking out is not possible

• electrical racking in or racking out is not possible (provided the racking motor control circuit on the switchgear is properly designed)

• emergency tripping of the circuit breaker is not possible using this push button

  NOTE: the circuit breaker may still be opened using the open (O OPEN) push button on the front of the circuit breaker

• electrical opening of the circuit breaker is still possible

• in the test/disconnected position, removal of the circuit breaker is still possible

Lock Pull-out the red racking/emergency trip push button and padlock it.		Check The red racking/emergency trip push button is blocked.		Unlock Remove the padlock(s) to release the red racking/emergency trip push button.

When a padlock or key lock is used in the circuit breaker compartment for lock-out/tag-out proceedures (not using the red racking/emergency trip push button), the racking mechanism is blocked from operating and the circuit breaker is unable to move into the connected position. However, the circuit breaker can be removed from the compartment if necessary. Refer to Schneider Electric user guide No NNZ9886800EN, SureSeT™ MV Metal-Clad, Indoor Switchgear, for further information.