What it is and what it does
The SENTRON 3VA1112-6EF36-0KH0 is a 3-pole molded case circuit breaker (MCCB) rated for 125 A continuous current, with a breaking capacity of 220 kA at 240 VAC — enough to handle high-fault utility feeds without cascading upstream. It's the line protection variant, meaning the trip curve and accessories are set for feeder or main breaker duty, not motor circuit protection.
Key ratings and what they mean for fit
Breaking capacity steps down as voltage rises: 220 kA at 240 V, 154 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 690 V. At 690 V the 17 kA figure still clears most industrial secondary faults, but if your service has higher available fault current at that voltage, you'd step up to a higher-rated 3VA frame. Rated continuous current Iu holds at 125 A from 40 °C up through 50 °C, then derates to 120 A at 55 °C, 117.5 A at 60 °C, 115 A at 65 °C, and 112.5 A at 70 °C. For a panel running at 55 °C ambient, you lose 5 A of headroom — plan your load margin accordingly. Width is 76.2 mm (a standard 3-pole MCCB footprint), depth 70 mm, height 130 mm. It drops into the same DIN-rail or panel-mount cutout as other 3VA1 frames; no re-drilling if you're swapping from a 3VA1112-5EF32-0CA0, though check the shunt trip wiring since that variant may differ.
Panel integration and accessories
The breaker ships with a factory-fitted shunt trip release (STL) and an auxiliary contact block carrying 2 auxiliary switches plus 1 trip alarm switch (HQ configuration). That covers remote trip and status feedback without adding a separate module. IP40 on the front means it's protected against solid objects over 1 mm — fine for enclosed panels; keep it out of washdown zones unless the enclosure provides the seal. The overcurrent release is a TM240 thermal-magnetic unit. No undervoltage release, no ground-fault monitoring, no communication module — it's a straightforward line-protection breaker for standard distribution.