The Siemens 3VA1112-5ED32-0BH0 is a SENTRON 3-pole molded case circuit breaker (MCCB) for line protection, rated 125 A at 40 °C and carrying a 187 kA interrupting capacity at 240 VAC — enough to handle high-fault utility feeds or transformer secondaries without cascading upstream breakers. At 415 V it still breaks 121 kA, and at 690 V it holds 17 kA, so the same frame covers both 400 V and 690 V distribution without a derate on the interrupting rating. The thermal derating curve is published: 125 A continuous up to 50 °C, then 122 A at 55 °C, 120 A at 60 °C, 117 A at 65 °C, and 114 A at 70 °C — useful when the breaker sits in a crowded, warm panel.
The UVR drops the breaker on loss of control voltage — standard for safety circuits where a downstream contactor or safety relay must not re-energise until the supply is stable.
The 3VA1112-5ED32-0BH0 measures 130 mm high, 76.2 mm wide, and 70 mm deep — a standard 3-pole MCCB footprint that mounts on DIN rail or panel-mount adapter.