The Siemens SENTRON 3VA1140-4EF32-0KH0 is a 3-pole molded case circuit breaker (MCCB) rated 40 A continuous at 40 °C, designed for line protection in industrial distribution panels. Its interrupting capacity reaches 121 kA at 240 V AC, 75.6 kA at 415 V, and 52.5 kA at 440 V — figures that govern its fault-clearing ability on high-capacity transformers or busway feeds.
Breaking capacity and thermal derating
At 415 V the breaker clears 75.6 kA; at 500 V and 690 V it still manages 11.9 kA. That spread covers most 400 V-class industrial mains without requiring a current-limiting fuse upstream. The thermal rating holds at 40 A from 40 °C to 50 °C, then tapers to 37 A at 70 °C — the derating curve matters if the breaker sits inside a hot enclosure near other heat sources.
Dimensions and panel fit
Body measures 130 mm high, 76.2 mm wide, 70 mm deep — a standard 3-pole MCCB footprint for DIN-rail or screw-mount panel integration. The 70 mm depth leaves clearance for rear busbar connections in a typical 200 mm deep enclosure.
Auxiliary and release options
This variant ships with a shunt trip (STL) for remote tripping and a 2+1 auxiliary switch configuration (2 auxiliary switches + 1 trip alarm switch HQ). A voltage-trip indicator is present; undervoltage release is not fitted. No ground-fault monitoring or communication module is included — it is a plain line-protection breaker with remote-trip capability.