The EVS40H3NW5A is a 4000 A rated, 3-pole drawout circuit breaker from Schneider Electric's EasyPact EVS range, designed for distribution applications per IEC 60947-2. At 690 V AC the breaking capacity is 50 kA Icu, still substantial for industrial mains. The electronic trip unit (EVS Trip System5A) provides overload protection with long-time delay, short-time short-circuit protection, and instantaneous short-circuit protection. The 20-minute thermal memory before and after tripping means the breaker remembers prior heating events — important for motor or transformer feeders where repeated overloads can accumulate thermal stress. Drawout mounting (with rail and base plate support) allows the breaker to be racked out for maintenance without disturbing the bus connections — standard for large switchgear where downtime for breaker swap must be minutes, not hours. Rear connection, vertical or horizontal orientation, and a 115 mm connection pitch without spreader define the busbar layout.
The part carries IEC 60947-2 certification for circuit-breaker performance, isolation suitability (yes, per standard), and Category B utilization — meaning it is designed for high-fault-level distribution without specific backup protection. Pollution degree 4 per IEC 60664-1 confirms it is rated for harsh industrial environments with conductive pollution.
The digital display provides fault indication for internal fault, overload, and short-circuit events — useful for field service techs to read the last trip cause without external software. The contact position indicator confirms open/closed state mechanically. Electrical durability is rated at 5000 cycles at 440/690 V AC without maintenance per IEC 60947-2. Mechanical durability is 20000 cycles with maintenance, 10000 without. Maximum breaking time is 25 ms — fast enough to limit let-through energy for downstream components.