Breaking capacity — the real-world fault-interrupting muscle
The 3VA1112-4EF32-0KC0: This MCCB delivers 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V. Those are the maximum prospective fault currents it can safely clear at each voltage level.
The 125 A rating holds flat from 40 °C through 50 °C ambient, then derates to 120 A at 55 °C, 117.5 A at 60 °C, 115 A at 65 °C, and 112.5 A at 70 °C.
Integrated accessories and release options
The shunt trip lets a remote signal — from an E-stop, a safety relay, or a PLC output — electrically trip the breaker.