MCCB for high-fault panel feeds
The Siemens SENTRON 3VA1140-5EF32-0KC0 is a 3-pole molded case circuit breaker rated for 40 A continuous current (Iu) at 40 °C, with a TM240 thermal-magnetic overcurrent release. Its interrupting capacity peaks at 187 kA at 240 V and still delivers 121 kA at 415 V — enough to handle high-fault utility feeds or transformer secondaries without cascading upstream. The front face carries IP40 protection, so it fits standard enclosed panelboards where dust ingress is the main concern, not washdown.
Breaking capacity across voltage bands
The 187 kA at 240 V is the headline number, but the real-world selectivity story is at 415 V (121 kA) and 440 V (75.6 kA). At 690 V the rating drops to 17 kA — still usable for 690 V distribution if the available fault current is known to be under that threshold. For a 400 V panel fed from a 1 MVA transformer, the 121 kA figure gives comfortable headroom for selective coordination with downstream breakers.
Panel fit and auxiliary wiring
Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep — a standard 3-pole MCCB footprint that fits most DIN-rail or panel-mount enclosures without re-drilling. The integrated shunt trip (STL) and two HQ auxiliary switches are wired via the front terminals; the auxiliary release designation 3VA9688-0BL33 is the factory-matched accessory. No undervoltage release or phase-failure detection on this variant, so external monitoring is needed if those functions are required.