Breaker-status indications, during normal operation or after a fault
A single type of contact provides all the different indication functions:
1.OF (ON/OFF) indicates the position of the circuit breaker contacts
2.SD (trip indication) indicates that the circuit breaker has tripped due to:
The SD contact returns to de-energised state when the circuit breaker is reset.
1.SDE (fault-trip indication) indicates that the circuit breaker has tripped due to:
The SD contact returns to de-energised state when the circuit breaker is reset
All the above auxiliary contacts are also available in "low-level" versions capable of switching very low loads (e.g. for the control of PLCs or electronic circuits).
OF, SD, SDE and SDV functions: a single type of contact provides all these different indication functions, depending on where it is inserted in the device. The contacts clip into slots behind the front cover of the circuit breaker (or the Vigi add-on for the SDV function).
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