Siemens 3VA1112-4EE32-0AA0 — 125 A SENTRON MCCB for Line Protection
The Siemens 3VA1112-4EE32-0AA0 is a 3-pole molded case circuit breaker from the SENTRON series, designed for line protection with a TM220 thermal-magnetic overcurrent release. It carries a continuous current rating of 125 A at 40 °C, derating to 114 A at 70 °C, making it suitable for main feeder or large sub-distribution protection in industrial panels. Breaking capacity is 75.6 kA at 415 V and 121 kA at 240 V, which provides solid fault-clearing headroom for high-fault installations. The TM220 release combines a thermal element for overload protection with a magnetic element for short-circuit response, tuned for cable and busbar protection rather than motor starting.
Panel Integration — Footprint and Environment
Dimensions are 130 mm height, 76.2 mm width, and 70 mm depth — a standard 3-pole MCCB footprint that fits most DIN-rail or panel-mount enclosures. Front-face protection is IP40, adequate for dry indoor panels; the unit is not rated for washdown or outdoor exposure. Maximum power dissipation is 28.1 W, which should be factored into enclosure thermal calculations, especially when multiple breakers are ganged. Operating temperature range is -25 °C to 70 °C.
Coordination Note — TM220 Release and Selectivity
The TM220 release is a fixed thermal-magnetic design with no electronic adjustment or communication function. For selectivity studies, the magnetic trip threshold is factory-set; consult the device manual for coordination curves with upstream or downstream SENTRON breakers. No undervoltage release or shunt trip is integrated on this variant.