Description
2.7 Basic unit
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
32 Manual, 10/2018, L1V30499596002-01
Design of the circuit breaker
The circuit breaker contains the contacts (3 or 4 poles), the switching mechanism, and the
internal accessories, comprising an operator and contact system and the internal
accessories. Each of the poles is contained in a separate plastic enclosure and consists of
the interrupting contact system and a current transformer.
Main components of the 3VA27 & 3WL10 circuit breakers
Area with front / rear connections
Auxiliary conductor terminal system
Electronic trip unit (ETU)
Switch position indicator contacts OPEN / CLOSED
"Mechanical ON" pushbutton
"Mechanical OFF" pushbutton
Status indicator of spring energy store CHARGED / DISCHARGED
Manual lever for charging the spring energy store
Toggle operating mechanism
PUSH TO TRIP: initiates a mechanical trip
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