Resetting the Circuit Breaker After a Trip Due to an Electrical Fault

@experts: Topic shared between DOCA0284 and DOCA0266; indicate if comments do not apply to both guides

Reset Sequence

DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH Do not re-close the device on an electrical fault. First inspect and, if necessary, repair the downstream equipment. Failure to follow these instructions will result in death or serious injury.

The table shows the sequence of actions to follow after a trip due to an electrical fault. Further explanation of each action is given in the following paragraphs.

Step	Action
1	Identify the trip cause on the pop-up trip message and trip cause LEDs.
2	Press OK to: Acknowledge and close the pop-up trip message. Open the trip context screen. NOTE: If the pop-up trip message is not acknowledged within the event timeout, the pop-up is displayed again.
3	Consult the trip context screen for: Name and settings of the tripping protection, date and time of the trip. Current values recorded before the trip.
4	Press OK to close the trip context screen.
5	Clear the electrical fault on the network.
6	Inspect the circuit breaker and switchboard after a short circuit.
7	Reset the circuit breaker.
8	Press the button for 3 seconds to: Reset the latched events. Switch off the trip cause LEDs and revert the Status bar to green. Return to the tree navigation menu.
9	When the circuit breaker is ready-to-close, re-close it.

NOTE: You can bypass steps 3, 4 and 8, by pressing the

button instead of OK in step 2.

Identifying the Trip Cause

Description	Display screen	Status and Trip cause LED description
MicroLogic Active 2.0, 5.0, 6.0: trip due to the long-time protection.	Trip message is displayed on a red screen.	Ready LED: green flashing Status bar: red blinking ERMS LED: off L trip cause LED: red blinking.
MicroLogic Active 5.0, 6.0: trip due to the short-time protection.	Trip message is displayed on a red screen.	Ready LED: green flashing Status bar: red blinking ERMS LED: off S trip cause LED: red blinking.
MicroLogic Active 2.0, 5.0, 6.0: trip due to the instantaneous protection.	Trip message is displayed on a red screen.	Ready LED: green flashing Status bar: red blinking ERMS LED: off I trip cause LED: red blinking.
MicroLogic Active 2.0, 5.0: not used. MicroLogic Active 6.0: trip due to the ground-fault protection.	Trip message is displayed on a red screen.	Ready LED: green flashing Status bar: red blinking ERMS LED: off G trip cause LED: red blinking.
MicroLogic Active 2.0, 5.0, 6.0: trip due to other events. NOTE: This feature will be available in future releases.	Trip message is displayed on a red screen.	Ready LED: green flashing Status bar: red blinking ERMS LED: off O trip cause LED: red blinking.

Clearing the Electrical Fault

DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E or CSA Z462 or local equivalent. This equipment must be installed and serviced by qualified electrical personnel. Turn off all power supplying this equipment before performing maintenance inspections.Assume that all circuits are live until they are de-energized, tested, grounded, and tagged. Consider all sources of power, including the possibility of backfeeding and control power. Always use a properly rated voltage sensing device to confirm that power is off. Replace all devices, doors, and covers before turning on power to this equipment. Beware of potential hazards and carefully inspect the work area for tools and objects that may have been left inside the equipment. Failure to follow these instructions will result in death or serious injury.

DANGER

HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH

Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E or CSA Z462 or local equivalent.
This equipment must be installed and serviced by qualified electrical personnel.
Turn off all power supplying this equipment before performing maintenance inspections.Assume that all circuits are live until they are de-energized, tested, grounded, and tagged. Consider all sources of power, including the possibility of backfeeding and control power.
Always use a properly rated voltage sensing device to confirm that power is off.
Replace all devices, doors, and covers before turning on power to this equipment.
Beware of potential hazards and carefully inspect the work area for tools and objects that may have been left inside the equipment.

Failure to follow these instructions will result in death or serious injury.

DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH Do not re-close the device on an electrical fault. First inspect and, if necessary, repair the downstream equipment. Failure to follow these instructions will result in death or serious injury.

The feed must be isolated before inspecting the electrical equipment downstream of the protection.

The fact that a circuit breaker has tripped does not remedy the cause of the electrical fault detected on the downstream electrical equipment.

Inspecting the Circuit Breaker and Switchboard After a Trip on Short Circuit

After a trip on short circuit due to short-time or instantaneous protection, the circuit breaker and switchboard must be inspected for smoke deposits or cracks in the circuit breaker casing.

Refer to DOCA0305•• MasterPacT MTZ IEC Circuit Breakers with MicroLogic Active Control Unit - Maintenance Guide, and contact your Schneider Electric Services representative.