125 A MCCB with 65 kA interrupting capacity
The Siemens SENTRON 3VA4112-4ED34-1AA0 is a 3-pole molded-case circuit breaker rated 125 A at 40 °C, with a TM210 thermal-magnetic overcurrent release that provides LI (long-time and instantaneous) protection.
The breaker holds full 125 A rating up to 50 °C ambient; above that it derates linearly to 122 A at 55 °C, 120 A at 60 °C, 117 A at 65 °C, and 115 A at 70 °C. This matters when the breaker is packed into a warm enclosure or mounted near other heat sources — the 70 °C figure is the operating maximum, not the derating floor. Maximum power loss is 29.1 W, so ventilation or spacing in the panel matters for dense layouts.
Dimensions are 76.2 mm wide, 129.4 mm high, and 75.1 mm deep — a standard 3-pole MCCB footprint that fits most DIN-rail or panel-mount enclosures without re-drilling. No undervoltage release, no motor drive, and no communication function are built in; this is a plain thermal-magnetic breaker for straightforward overcurrent and short-circuit protection.