The Siemens SENTRON 3VM1112-4ED12-0AA0 is a 1-pole molded case circuit breaker (MCCB) rated 125 A continuous at 40 °C, with a TM210 thermal-magnetic overcurrent release providing LI protection (long-time and instantaneous). Breaking capacity reaches 76 kA at 240 V AC and 9 kA at 415 V AC — the 415 V figure governs most industrial panel applications and must be checked against the available fault current at the installation point.
Thermal derating and continuous current
The breaker holds 125 A up to 50 °C ambient, then derates linearly to 114 A at 70 °C. For a panel with internal temperature rise, the 70 °C figure (114 A) is the realistic continuous rating — size upstream conductors and busbars accordingly.
Dimensions and panel fit
At 25.4 mm wide (1 inch), 130 mm tall, and 70 mm deep, this single-pole breaker occupies one standard MCCB mounting slot. The 70 mm depth is the body dimension; allow clearance for wiring and arc chute exhaust per Siemens mounting guidelines.
Electrical ratings and approvals context
Rated insulation voltage 500 V, maximum operating voltage 415 V AC / 125 V DC. Front protection IP40 — suitable for enclosed panel mounting, not for washdown environments. Maximum power loss 8 W at rated current, relevant for panel thermal calculations.