Technical data

11/98

Accessories

06313049

0631305106313052

Remote

Open

Remote

Open

Instantaneous Undervoltage Trip Device (MN)

This release instantaneously opens the circuit breaker when supply voltage drops below a value

between 35% and 70% of rated voltage. If the release is not energized, the circuit breaker cannot

be closed (either manually or electrically). Any attempt to close it will have no effect on the main

contacts. Closing is possible when the release voltage reaches 85% of its rated value. The

instantaneous undervoltage trip device is field-installable.

Control Voltage (V)

60 Hz 120–240–480

DC 24–48–125–250

Consumption (Inrush and Sealed)

AC 20 VA

DC 15 W

Operating Time 40 ms

Opening Coils

Three types of voltage releases can be used for remote opening of the circuit breakers:

n Shunt trip (MX)

n Instantaneous undervoltage trip device (MN)

n Time-delayed undervoltage trip device (MNR)

Possible Combinations

Each MASTERPACT circuit breaker can be equipped with:

n One shunt trip (MX) + one undervoltage trip device (MN or MNR)

n Or two shunt trips (MX)

Shunt Trip (MX)

This release is rated for continuous duty and operates with control voltages between 85% and 110%

of its rating. However, when series connected with an "a" auxiliary switch, the shunt trip can be

operated with 55% or more of its rated voltage and can be used for ground-fault protection when

combined with a Class 1 ground-fault sensing element. The shunt trip is field-installable.