Siemens SENTRON 3WA Air Manual page 31

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)
(2)
(3)
(4)
(5)
Shutter
(1)
(2)
(3)
(4)
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".
3WA Air Circuit Breakers
Equipment Manual, 05/2021, 92310000002-03
Guide frame, left inner side (right inner side accordingly)
Coding pin on the racking rail in the guide frame
Racking rail
Withdrawable circuit breaker, right side (left side correspondingly)
Coding pin on withdrawable circuit breaker
Top sliding cover
Shutter lever (in center position)
Bottom sliding cover
Shutter actuator
2.2 Circuit breakers and non-automatic circuit breakers
Description
29