Siemens SENTRON 3WA1 - Page 32

Description
2.2 Circuit breakers and non-automatic circuit breakers
3WA1 air circuit breaker
30 Equipment Manual, 02/2023, 92310000002-06
Rated-current coding
Guide frames and withdrawable circuit breakers are equipped with a rated-current
coding as standard.
Rated-current coding ensures that only those circuit breakers whose guide frames are
designed for the circuit breakers can be inserted into the guide frame.
(1)
Guide frame, left inner side (right inner side accordingly)
(2)
Coding pin on the racking rail in the guide frame
(3)
Racking rail
(4)
Withdrawable circuit breaker, right side (left side correspondingly)
(5)
Coding pin on withdrawable circuit breaker
Shutter
(1)
Top sliding cover
(2)
Shutter lever (in center position)
(3)
Bottom sliding cover
(4)
Shutter actuator
The shutter is used for touch protection. It consists of molded-plastic plates and covers
the live main circuit in the guide frame.
The sliding covers of the shutter close over the contacts of the guide frame in the
movement positions "TEST" and "DISCONNECT". Thus the isolation condition is already
fulfilled in the movement position "TEST".