Drawout MasterPacT MTZ2/MTZ3 Circuit Breaker Status

@experts: Topic shared between DOCA0284 and DOCA0285, with profiling; indicate if comments do not apply to both guides

Drawout Circuit Breaker Handling Conditions

Connection or disconnection of the drawout circuit breaker requires insertion of the racking handle. When interlocks, padlocks, or an open door lock are in place, the racking handle cannot be inserted.

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 only be installed and serviced by qualified electrical personnel. Failure to follow these instructions will result in death or serious injury.

Drawout Circuit Breaker Positions

The indicator located on the front of the chassis locally signals the position of the circuit breaker in the chassis.

Circuit breaker position	Connector position	Circuit breaker status
Connected	Disconnecting contact clusters: engaged Control: engaged	Can be operated. Ready for service.
Test	Disconnecting contact clusters: disengaged - the minimum distance between the circuit breaker racking terminals and the chassis clusters is reached. Control: engaged	Can be operated. Can have operation and control systems tested.
Disconnected	Disconnecting contact clusters: disengaged Control: disengaged	Can be operated. Can be removed from chassis.
Withdrawn	Disconnecting contact clusters: disengaged Control: disengaged	Removed from chassis.

Drawout Circuit Breaker Position Contacts

The position of the circuit breaker in the chassis is indicated remotely by the following position contacts:

CE: connected position
CT: test position
CD: disconnected position

The state of the position contacts changes according to the circuit breaker position during racking-in and racking-out operations, as shown in the diagram below.

A Circuit breaker in connected position

B Separation of the main circuits

C Circuit breaker in test position

D Separation of auxiliary circuits

E Circuit breaker in disconnected position

Position contact is open.

Position contact is closed.

Optional Position Contacts

Optional position contacts can be added as follows:

2 CD disconnected position contacts
3 CE connected position contacts
1 CT test position contact