Auxiliary Releases - Siemens 3VA1 100 A Manual

Accessories
4.2 Internal accessories
4.2.5

Auxiliary releases

Auxiliary releases allow remote electrical tripping of the circuit breaker. They can be used to
monitor control or main circuits in order to implement a protective system against accidental
restart following a power failure, for example.
Auxiliary releases therefore perform a main circuit monitoring function in addition to the main
circuit monitoring performed by the trip unit.
Auxiliary releases are extremely easy to install. No tools are required because these 21 mm
wide components are simply snapped into place in the accessories compartments to the left
and right of the handle. The accessories are connected by screw terminals for auxiliary
conductors with a cross-section of up to 1.5 mm
the unit for easy access.
The shunt trips are suitable for use in electrical interlocks. An attempt to switch on a circuit
breaker while the interlock voltage is applied to the shunt trip leads to a so-called "no-load
switching operation", i.e. the basic breaker always returns to the TRIP position and the main
contacts never close.
Note
All auxiliary releases are reverse-polarity-protected.
158
. The terminals are mounted on the front of
2
3VA molded case circuit breakers
Manual, 04/2015, A5E03603177010-02