The Schneider Electric EVS12H3MW20 is a 3-pole drawout circuit breaker from the EasyPact EVS range, rated 1250 A at 40 °C with a breaking capacity of 65 kA Icu at 220–440 V AC 50/60 Hz per IEC 60947-2. It uses an electronic EVS Trip System2.0 trip unit with LI protection (long-time overload and instantaneous short-circuit). The drawout mounting means the breaker chassis stays wired to the bus while the moving portion pulls out for maintenance or swap — common in switchgear lineups where downtime needs to be measured in minutes, not hours.
Above that, you derate per the thermal curve. At 690 V AC the Icu drops to 50 kA, still robust for most industrial supplies. The 25 ms maximum breaking time tells you the arc is extinguished within two and a half cycles at 60 Hz — fast enough to limit let-through energy for downstream equipment. That means if a motor starts hot and trips on overload, the breaker remembers the heat and won't reclose immediately — it forces a cooldown period. Useful for motor feeders where repeated hot starts could damage windings.
Drawout mounting on a rail base plate with rear vertical or horizontal connections. The 115 mm connection pitch without spreader matches standard bus-bar spacing in common switchgear cubicles.