The Schneider Electric EVS40H3MW6A is a 3-pole drawout air circuit breaker from the EasyPact EVS range, rated 4000 A continuous at 40 °C and built to IEC 60947-2 for distribution duty. The 4000 A trip unit rating and 65 kA Icu at 440 V AC mean it handles main-feed or heavy-bus faults without cascading upstream — the H breaking-capacity code tells you it's sized for high-fault installations where a standard breaker would weld shut. The electronic EVS Trip System6A provides overload (long-time), instantaneous short-circuit, short-time short-circuit, and earth-fault protection, with a 20-minute thermal-memory reset after a trip so you don't nuisance-trip on a reclose. Drawout mounting means the breaker slides onto a rail or base plate — you can rack it out for maintenance or replacement without disturbing the bus connections. The rear-connected vertical or horizontal terminals accept bus bars or cable lugs at a 115 mm pitch without a spreader.
Category B utilisation means it's designed for selectivity with downstream breakers — the short-time delay lets a fault clear closer to the load before this breaker opens. Mechanical durability of 20,000 cycles with maintenance and 10,000 without tells you it's built for a fixed installation, not frequent switching.