Withdrawable Circuit Breaker

Introduction

In addition to the advantages provided by a plug-in base, installation of the circuit breaker on a chassis facilitates handling. Withdrawable chassis circuit breakers offer three positions, with transfer from one to the other after mechanical unlocking:

• Connected: the power circuits are connected.

• Disconnected: the power circuits are disconnected, the circuit breaker can be operated to check auxiliary operation.

• Removed: the circuit breaker is free and can be removed from the chassis.

The following types of circuit breaker can be installed in a chassis:

• 3P and 4P circuit breakers

• Circuit breakers with toggle handle, direct rotary handle, or extended rotary handle

• Motor-operated circuit breakers

• Circuit breakers with VigiPacT Add-on

The withdrawable circuit breaker is made up of:

• The fixed circuit breaker

• A plug-in kit

• Two chassis side plates for the plug-in base

• Two chassis side plates for the circuit breaker

For more information about withdrawable circuit breaker installation, consult the instruction sheets on the Schneider Electric website:

• GHD16277AA, Chassis side plates for ComPact NSX100-250

• GHD16317AA, Chassis side plates for ComPact NSX400-630

Plug-in Kit and Chassis Installation Demonstration Video

To access a demonstration video about the installation of a plug-in kit and chassis for withdrawable ComPact NSX100-250 circuit breakers, click the following link: https://youtu.be/XaXO6QgeWvM, copy and paste the link to your Web browser, or scan the QR code.

Disconnecting the Circuit Breaker

DANGER

HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E, CSA Z462, NOM-029-STPS, or local equivalent. This equipment must only be installed and serviced by qualified electrical personnel. The circuit breaker must be in the O (OFF) position. Do not use tools to disconnect or connect the circuit breaker. Failure to follow these instructions will result in death or serious injury.

Follow this procedure to disconnect the circuit breaker:

Step	Action
1		Switch the circuit breaker to the O (OFF) position.
2		Move both locking levers down as far as they can go.
3		Push down both operating handles at the same time until you hear a double-click from the locking levers (as the locking levers return to their original position). The circuit breaker is disconnected.

NOTE:

• The auxiliary circuits can be:

  • Automatically disconnected because of the connectors located on the chassis and at the rear of the circuit breaker.

  • Left connected for a circuit breaker with a manual auxiliary connector.

• Open the circuit breaker before disconnecting it. If the circuit breaker is in the closed I (ON) position when disconnecting, a safety mechanism ensures that the poles open automatically by tripping the circuit breaker before the pins disconnect.

Removing the Circuit Breaker

DANGER

HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E, CSA Z462, NOM-029-STPS, or local equivalent. This equipment must only be installed and serviced by qualified electrical personnel. The circuit breaker must be in the O (OFF) position. Do not use tools to disconnect or connect the circuit breaker. Failure to follow these instructions will result in death or serious injury.

Follow this procedure to remove the circuit breaker:

Step	Action
1		Move both locking levers down.
2		Push down both operating handles as far as the next notch.
3		Remove the circuit breaker, keeping it horizontal.

Connecting the Circuit Breaker

DANGER

HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E, CSA Z462, NOM-029-STPS, or local equivalent. This equipment must only be installed and serviced by qualified electrical personnel. The circuit breaker must be in the O (OFF) position. Do not use tools to disconnect or connect the circuit breaker. Failure to follow these instructions will result in death or serious injury.

Follow this procedure to connect the circuit breaker:

Step	Action
1		Switch the circuit breaker to the open O (OFF) position. Move both operating handles down to the low position on the chassis. Push in the circuit breaker until the locking levers clicks.
2		Move both locking levers forward.
3		Raise both locking levers at the same time.

NOTE: Open the circuit breaker before connecting it. If the circuit breaker is in the closed I (ON) position when connecting, a mechanism opens the poles automatically by tripping the circuit breaker before the pins connect.

Withdrawable Circuit Breaker Protection Against Direct Contact With Power Circuits

The following table shows withdrawable circuit breaker configurations with the corresponding protection indices (IP):

Configuration	Protection index	Description
	IP20	Built-in chassis: Without circuit breaker With circuit breaker without terminal shields
	IP40	Built-in chassis and circuit breaker with terminal shields.
	IP40	Chassis with adapter, terminal shields and blanking plate without circuit breaker: The adapter enables the use of all the connection accessories of the withdrawable circuit breaker. It is required to equip the withdrawable circuit breaker with long and short terminal shields and interphase barriers. Terminal shields are mandatory for withdrawable circuit breakers. Short terminal shields are supplied in the plug-in kit. They can be replaced by long terminal shields available as an option. The blanking plate is not supplied by Schneider Electric.
	IP40	Chassis with adapter and terminal shields, and circuit breaker with terminal shields.

Auxiliary Circuit Test with Circuit Breaker Disconnected (Optional)

The auxiliary circuit test function is possible with circuit breakers which have manual auxiliary connectors.

In the disconnected position, operate the circuit breaker (by the actuator or push-to-trip button) to check whether the auxiliary circuits are working correctly.

Disconnect the manual auxiliary connector (if the circuit breaker has one) before removing the circuit breaker.

Carriage Switches (Optional)

Two changeover contacts can be installed on the chassis:

A Connected-position carriage switch (CE)

B Disconnected-position carriage switch (CD)

For more information about contact operation, refer to control auxiliaries.

Carriage switches, in conjunction with the IO module, provide the chassis management function, which is used to:

• Record and check the position of the moving part of the withdrawable circuit breaker in the chassis

• Provide information about preventive maintenance actions

• Notify the remote controller about the position of the withdrawable circuit breaker.

For more information about the chassis management function, refer to DOCA0055EN, Enerlin'X IO - Input/Output Application Module for One IEC Circuit Breaker - User Guide,

Locking the Chassis