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 220 kA interrupting rating at 240 V means it can safely clear a bolted fault on a high-capacity transformer secondary without the arc flashing over to adjacent buswork — a key spec for main or feeder breaker positions in a distribution panelboard. 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 800 V rated insulation voltage confirms the 690 V breaking rating is legitimate for that voltage class. The breaker includes an undervoltage release (UVR) and two auxiliary switches HQ (form C). The UVR trips the breaker when control voltage drops below a threshold — standard for emergency-stop chains or undervoltage protection on motor feeders. The auxiliary switches report position back to a PLC or status lamp without extra wiring.
Integration
Dimensions: 130 mm height, 76.2 mm width, 70 mm depth. The 70 mm depth fits standard 600 mm deep enclosures with room for rear bus connections. 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. Operating temperature range -25 °C to 70 °C, storage -40 °C to 80 °C.