31
ACC E SS O R I E S
ADVAC® smart coils
Closing coil
Shunt closing release (-MC) allows the closing
command of the apparatus to be transmitted by
remote control. This release is suitable for both
instantaneous and permanent duty. An auxiliary
contact that de-energizes it after the circuit
breaker has closed is not needed. The permanently
supplied release provides the electrical anti-
pumping function with both electrical opening
and re-closing commands maintained. To
guarantee the closing action, the current impulse
must last at least 100 ms. If shunt closing release
-MBC and undervoltage release -MBU have the
same supply voltage and the circuit breaker must
close automatically when auxiliary voltage returns,
there must be a delay of at least 50 ms between
the undervoltage release energizing and the shunt
closing release energizing to allow the closing
operation to take place. Continuity functionality
can be checked with a continuity control device
(CCC), opening circuit supervision (TCS) or the STU
functionality control device (supplied on request).