Siemens SENTRON 3WA Air - Rated-Current Coding for Insertion; Shutter Mechanism for Touch Protection

Description
2.2 Circuit breakers and non-automatic circuit breakers
3WA Air Circuit Breakers
Equipment Manual, 05/2021, 92310000002-03
29
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 insulating panels and covers the live
main circuits 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”.