Connection Of The Second Shunt Trip; Electrical Interlocks For Switching Via Communication - Siemens SENTRON 3WA1 Manual

Applications
3.4 Applications with closing coil and shunt trip
3.4.4

Connection of the second shunt trip

In addition to the first shunt trip ST or ST-COM, the circuit breaker can also be equipped
with a second shunt trip ST2 as an option. This one is only conventional and cannot be
operated via communication.
When the S3 button is operated, the circuit breaker opens via the second shunt trip ST2.
(A)
(B)
3.4.5

Electrical interlocks for switching via communication

Closing and opening via communication can be deliberately controlled by interlocks in
the case of a communication-capable circuit breaker.
The following terms are used in the circuit diagrams:
• Local only
Closing and opening are only possible using the two buttons.
• Remote + Local
Switching is possible via communication and using the two buttons.
• Remote only
Closing and opening are only possible via communication.
212
Circuit breaker with "ready4COM"
Circuit breaker without "ready4COM"
3WA1 air circuit breaker
Equipment Manual, 02/2023, 92310000002-06