The Schneider Electric MGP0404X is a PowerPacT 4 molded case circuit breaker (MCCB) with 4 poles (4P), rated 40 A at 40 °C, and designed for distribution in panelboards up to 250 A or 400/630 A. It uses a thermal-magnetic TM-D trip unit providing LI protection — thermal for overload (adjustable 28...40 A) and magnetic for short-circuit.
The MGP0404X is listed as obsolete by Schneider Electric.
The MGP0404X is certified to BS EN 60947-2, the standard for low-voltage switchgear and controlgear — specifically for circuit breakers. It is suitable for isolation per that standard, meaning it provides a visible break and meets the isolation gap requirements. Rated impulse withstand voltage is 8 kV, and insulation voltage is 800 V.
Panel-mounted via backplate, accepting horizontal or vertical orientation. Occupies 4 modules of 35 mm width. The toggle control and 4-pole configuration are straightforward for a panel builder — wire the line and load sides, set the thermal adjustment dial between 28 and 40 A to match the protected conductor, and torque to the nameplate values.