This Micrologic 4.2 is a 3 poles 3d electronic trip unit used on Compact NSX 100/160/250 circuit breakers.This 40A rating electronic trip unit is an optimum choice for all standard and specific applications.It embeds adjustable long time protection against overloads.It provides also an adjustable short-time protection and a fixed instantaneous protection against short-circuits.Micrologic 4.2 Vigi trip unit offers an integrated adjustable earth-leakage protection.Micrologic 4.2 indicates overloads with Alarm LEDs.The green Ready LED flashes if the circuit breaker is ready to trip.An earth leakage pre-alarm can be remotely available by installing the optional SDx module (LV429532).This product is part of our EcoStruxure Power architecture if associated with PowerTag NSX and Compact NSX basic frame.