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©1995 Square D—All Rights Reserved
11/98
Advantages
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Drawout Circuit Breaker Design
n The drawout assembly mechanism allows the circuit breaker to be racked in four positions
(connected, test, disconnected and withdrawn).
n The closing and opening push buttons, the racking handle and racking mechanism are accessible
through the front door cutout. Therefore the circuit breaker can be disconnected without opening
the door and accessing live parts. Safety shutters can be provided as an option for protection from
live parts when the circuit breaker is removed.
Connected Position Test Position Disconnected Position
True Two-step Stored Energy Mechanism
The closing time is less than five cycles. The circuit breaker is operated via a stored-energy
mechanism which can be manually or motor charged. Closing and opening operations can be initiated
either from the local push buttons on the circuit breaker front face or by remote control.
O–C–O cycle is possible without recharging.
Designed for No Maintenance...
The circuit breaker has fewer parts (by a factor of at least five) than conventional circuit breakers
while performing the same functions. This leads to greatly enhanced reliability and reduction in
maintenance. Under normal operating conditions, according to standards and controlled by tests, the
circuit breaker does not require maintenance.
…But Exceeds Standards with an Easy and Reduced Maintenance
It is easy to remove the arc chutes and visually inspect the contacts and wear indicator. The operation
counter (spring-charging motor option) can also indicate when inspections and possible maintenance
should be done. After operating conditions exceeding those given by standards, it is possible to
extend the circuit breaker life by:
n Replacement of arc chutes and spring charging motor by the user.
n Replacement of main contacts by an after sale service team.
Note: See pages 62–63 for additional information.
Contact Good
(Circuit Breaker Closed)
Contact Worn
(Circuit Breaker Closed)