Schneider Electric MJA36600JK Circuit Breaker

Schneider Electric’s PowerPact MJA36600JK is a 600 A, three‑pole molded‑case circuit breaker from the PowerPact M frame, designed for industrial power distribution. It is rated for up to 600 V AC with a 25 kA short‑circuit interrupting rating and employs an electronic trip unit for precise, repeatable protection. The device is configured for I‑Line connection (line‑side mounting) and carries ET 1.0 with a continuous‑load rating at 80%. The MJA36600JK sits in the 600 A fixed‑trip end of the M‑frame family; Schneider’s catalog shows 400 A and 600 A fixed‑trip options and a 300–800 A adjustable unit, making the 600 A model the fixed‑trip option in that range. Used to protect feeders and distribution circuits in panelboards, motor control centers, and switchgear, it provides reliable overcurrent protection for circuits up to 600 V. Its electronic trip mechanism enables rapid response to overloads and short circuits, helping to isolate faults while sustaining service to unaffected loads.