Shunt Trip (MX) and Undervoltage Release (MN)

MX or MN Voltage Release

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

Shunt trips serve primarily for remote, emergency-off commands. Undervoltage releases disconnect under low-voltage conditions.

Operating Voltages for MN/MX, Visible Through Front Cover

Installation and Connection

Voltage releases snap into a cavity under the front accessory cover of the circuit breaker.
The presence and characteristics of the voltage release is visible from the front face through a window.
Each spring terminal may be connected by one 0.5–1.5 mm² (20–16 AWG) stranded copper wire.

For information on electrical characteristics and wiring recommendations of MN/MX, see Shunt Trip (MX) and Undervoltage Release (MN) Wiring Rules

Operation

The circuit breaker must be reset locally after being tripped by shunt trip (MX) or undervoltage release (MN).
Tripping by the shunt trip or undervoltage release has priority over manual 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.

Standards

MN/MX voltage releases comply with with UL 489, CSA C22.2 No. 5 and IEC 60947-2 Standards.
MN/MX voltage releases are Listed for field installation per UL file E103955 and Certified under CSA file 177007.