Schneider Electric MJA36400 Molded Case Circuit Breaker

Schneider Electric's Square D PowerPact MJA36400 molded‑case circuit breaker is a 400 A, 3‑pole unit rated for 600 V AC with a 25 kA interrupting rating, intended for primary or secondary protection in industrial panelboards. It belongs to the PowerPact M frame and uses I‑Line mounting with a line‑lug/load‑terminal arrangement for easy integration into feeders and panel boards. The thermal‑magnetic trip mechanism (ET 1.0) provides reliable short‑circuit and overload protection, and the device operates at standard 50/60 Hz power systems. The MJA36400 is available in variants such as MJA36400YP with a padlock‑ready handle and MJA36400SA with electronic trip, giving options for lockout or more advanced trip electronics in control schemes. Typical applications include main feeder protection in distribution panels, motor control centers, and industrial electrical installations requiring robust overcurrent protection for three‑phase circuits.