What the interrupting ratings mean for your panel
The 3VA1112-4ED42-0AA0 is a Siemens SENTRON 4-pole molded case circuit breaker (MCCB) rated for 125 A continuous current (Iu) with a TM210 thermal-magnetic release. Its interrupting capacity hits 121 kA at 240 V AC, 75.6 kA at 415 V AC, 52.5 kA at 440 V AC, and 11.9 kA at both 500 V and 690 V AC — so the same breaker covers high-fault service-entrance positions at 240 V and downstream distribution at 415 V without a frame-size jump. The 125 A rating holds flat from 40 °C through 50 °C, then derates to 114 A at 70 °C; that means no oversizing needed for a warm panel up to 50 °C.
Panel fit and mounting
The breaker measures 70 mm deep, 101.6 mm wide, and 130 mm high — a 4-pole MCCB footprint that fits standard Siemens SENTRON panel-mounting patterns. Front face carries IP40 protection, so it is suited for enclosed distribution boards where incidental tool or finger contact is the concern, not washdown. Rated insulation voltage (Ui) is 800 V, and the maximum DC operational voltage is 600 V, which covers most industrial DC bus applications.
Release and protection design
The TM210 overcurrent release is a thermal-magnetic type — thermal element for overload protection, magnetic element for short-circuit. No ground-fault monitoring, no N-conductor protection, and no communication function on this variant. The product version is line protection, meaning it is intended for feeder and main breaker duty rather than motor branch-circuit protection. Maximum power loss is 28.1 W, which factors into enclosure thermal calculations.