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.
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.
Release and protection design
The TM210 overcurrent release is a thermal-magnetic type — thermal element for overload protection, magnetic element for short-circuit. 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.