Product identity and key ratings
The Siemens SENTRON 3VM1112-4ED42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for line protection. It carries a continuous current of 125 A at 40 °C, derating through 70 °C to 114 A. The TM210 thermal-magnetic overcurrent release is fixed, not adjustable. Breaking capacity is the headline spec here: 121 kA at 240 V AC, 76 kA at 415 V, 53 kA at 440 V, and 12 kA at 500 V. That covers most industrial distribution panels fed from a transformer secondary. For DC applications, the manual provides specific values up to 500 V.
Dimensions and panel fit
Footprint: 101.6 mm wide, 130 mm tall, 70 mm deep. That is a standard 4-pole MCCB width for a 125 A frame. Mounts on a DIN rail or direct panel; the IP40 front face is suitable for enclosed distribution boards where washdown is not required.
Environmental and compliance
Operating temperature range from -25 °C to 70 °C; storage from -40 °C to 80 °C. Maximum power loss is 23 W. The part carries no communication function, no ground-fault monitoring, and no neutral conductor protection as standard.