Circuit-breakers Contact sequence of the auxiliary contacts
Early-make auxiliary contact HIV
Used to provide command or signal outputs from processes which are initiated before the closure or opening of the
main contact system. Because they close early, they can be used for interlocks with other switches. Furthermore, they allow a
switch position indication. The HIV has the same position in the tripped position of the circuit-breaker and the off position of the
circuit-breaker. Because of their early-make feature, they can be used for energizing the undervoltage release (→ section
Undervoltage releases) 0 → Switched on 0 I Switch off
+ I Trip ■ contacts closed □ contacts opened
I Switch off
+