Schneider Electric Class 615 Shunt Trip and Undervoltage Trip, Undervoltage trip, Shunt trip MX

Compact® NSF and NSJ 150 to 600 A Circuit Breakers

Section 9—Accessories

SHUNT TRIP AND UNDERVOLTAGE TRIP

A voltage release can be used to trip the circuit breaker via a control signal.

06153102

Undervoltage trip	•	Trips circuit breaker when the control voltage drops below a tripping threshold
(MN)	•	Drops out between 35% and 70% of rated voltage
	• Circuit breaker closing is possible only if the voltage exceeds 85% of rated voltage
	•	Permanent type
	• If an overvoltage condition exists, operation of circuit breaker closing mechanism will not permit the
		main contacts to touch, even momentarily
Shunt trip (MX)	•	Trips the circuit breaker when control voltage rises above 70% of its rated voltage
	• Impulse type ≥ 20 ms 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 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–
		NSJ600 circuit breakers
Installation and	•	Accessories are common to NSF and NSJ circuit breakers and are located within the circuit breaker
Connection		behind front accessory cover
	• Each terminal may be connected by one #18–#14 AWG (1.0–2.5 mm2) stranded copper wire
	Electrical Characteristics
				AC	DC
	Rated Voltage (V)			24, 48, 110–130, 208–277, 380–480, 525, 600	12, 24, 30, 48, 60, 125, 250
	Consumption		Pickup (MX)	< 10 VA	< 5 W
			Seal-in (MN)	< 5 VA	< 5 W
	Clearing Time (ms)			< 50	< 50

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