The Siemens 3VA1112-6EF36-0BC0 is a SENTRON 3-pole molded case circuit breaker rated for line protection, carrying 125 A continuously at 40 °C and breaking up to 220 kA at 240 V. The 125 A frame is thermally rated through 70 °C (derated to 114 A at 70 °C), so it holds full rating in a warm enclosure as long as ambient stays under 50 °C.
Ratings and selectivity
Breaking capacity drops across voltage: 220 kA at 240 V, 154 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 500 V and 690 V. That 17 kA floor at 690 V still covers most industrial motor branch circuits; the 154 kA at 415 V gives headroom for a main breaker in a 400 V panel with a large upstream transformer. The auxiliary switches report position back to a PLC or status lamp without extra wiring.
Integration
The 76.2 mm width (3 inches) matches the 3-pole SENTRON 3VA footprint — it occupies one 3-pole position in a panelboard or can be DIN-rail mounted with the appropriate adapter.