The Siemens SENTRON 3VA1112-3EF36-0KC0 is a 3-pole molded case circuit breaker (MCCB) rated for 125 A continuous current at 40 °C, with a TM240 thermal-magnetic overcurrent release — meaning the thermal pickup is fixed at 125 A and the magnetic short-circuit trip is calibrated for the TM240 curve. It is the line-protection version, so it is intended for feeder and main breaker duty in distribution panels, not for direct motor starting. Breaking capacity runs 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 10.5 kA at 690 V (–).
Auxiliaries and releases — what is on board
If you need remote trip via undervoltage or a ground-fault alarm, those are separate accessory slots on the 3VA platform — this base unit leaves them open. The trip indicator is not fitted — no mechanical flag on the front to show a trip event. For troubleshooting, you would rely on the shunt trip or the auxiliary contact state.
At 55 °C it drops to 120 A, at 60 °C to 117.5 A, at 65 °C to 115 A, and at 70 °C to 112.5 A (–).
The 3VA1112-3EF36-0KC0 measures 130 mm high, 76.2 mm wide, and 70 mm deep (–). If you are swapping out an older 3VA1112-5EF32-0CA0, the width and depth are identical; the difference is in the release and breaking capacity, not the mounting.