Specifications

25
COMPACT
®
NS circuit breaker
A voltage release can be used to trip the circuit breaker via a control signal.
Undervoltage trip (MN)
■ Trips the circuit breaker when the control voltage drops below a tripping threshold;
■ Drops out between 35% and 70% of the rated voltage;
■ Circuit breaker closing is possible only if the voltage exceeds 85% of the rated
voltage;
■ Permanent type;
■ If an overvoltage condition exists, operation of the closing mechanism of the circuit
breaker will not permit the main contacts to touch, even momentarily.
Shunt trip (MX)
Trips the circuit breaker when the control voltage rises above 70% of its rated
voltage.
Impulse type ≥ 20ms or maintained control signals.
AC shunt trips can be operated at 55% of their rated voltage, making them suitable
for ground-fault protection when combined with a Class I ground-fault sensing
element.
Operation
■ The circuit breaker must be reset locally after being tripped by a shunt trip or
undervoltage trip (MN or MX);
■ MN or MX tripping has priority over manual (or motor operator) closing. In the
presence of a standing trip order, such an action does not result in any closing, even
temporarily, of the main contacts;
■ Endurance:
❑ 50% of the rated mechanical endurance of the circuit breaker for COMPACT
®
NSF150 to NSJ600 circuit breakers.
Installation and connection
■ Accessories are common to NSF and NSJ circuit breakers. They are located
within the circuit breaker behind the front accessory cover;
■ Each terminal may be connected by one #18–#14 AWG (1.0–2.5 mm
2
) stranded
copper wire.
Shunt trip and undervoltage trip
For COMPACT
®
NSF150 to
NSJ600 circuit breakers
044313
Accessories
Electrical characteristics
AC DC
Rated voltage (V) 24, 48, 110–130, 208–277, 12, 24, 30, 48,
380–480, 525, 600 60, 125, 250
Consumption pickup (MX) < 10 VA < 5 W
seal-in (MN) < 5 VA < 5 W
Clearing time (ms) < 50 < 50
COMPACT
®
NS circuit breaker: functions and characteristics