Accessories
4.2 Internal accessories
3VA molded case circuit breakers with IEC certificate
198 Manual, 03/2019, A5E03603177010-03
The diagram below uses the example of an ET200S to illustrate the conventional method of
connecting the electronics-compatible auxiliary switch AUX, the trip alarm switch TAS and
the motor operator MO320 to a distributed I/O unit.
Further information about contact reliability can be found at the end of this chapter.
The purpose of auxiliary switches is to signal the position of the main contacts of the molded
case circuit breaker. The contacts of the auxiliary switch open and close simultaneously with
the main contacts of the molded case circuit breaker.
Leading changeover switches LCS
Leading changeover switches signal the opening of the main contacts with a lead time of
20 ms in advance of circuit breaker trips and can be used for load shedding, for example.
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