What this MCCB delivers — and what the ratings mean for your panel
The Siemens 3VA1040-4ED32-0HC0 is a 3-pole molded case circuit breaker (MCCB) from the SENTRON family, designed for line protection in distribution panels. Rated 40 A continuous at 40 °C ambient, it holds that rating up to 50 °C before derating to 38.4 A at 55 °C and 36 A at 70 °C — useful if the breaker sits in a warm enclosure or near other heat sources. Breaking capacity hits 121 kA at 240 V AC and 75.6 kA at 415 V AC, dropping to 52.5 kA at 440 V and 11.9 kA at 500/690 V. That 121 kA figure at 240 V means it can safely interrupt a high-fault-current scenario on a 240 V distribution bus without upstream coordination failure. Rated insulation voltage is 800 V, so it's rated for 690 V line-to-line systems. The breaker ships with a shunt trip release (STL) and two auxiliary switches (HQ) factory-installed. The shunt trip allows remote tripping from a PLC or emergency-stop circuit — common in machine-tool or conveyor line panels where a safety contactor alone isn't enough. The auxiliary switches provide status feedback (open/closed) for the control system. The basic switch variant is order code 3VA10404ED320AA0, but this unit includes the release and auxiliaries already mounted. Dimensions are 70 mm deep, 76.2 mm wide, and 130 mm high — a standard 3-pole MCCB footprint that fits most DIN-rail or panel-mount enclosures without rework. Maximum power loss is 10.8 W, manageable for thermal budgeting inside a sealed cabinet. Operating temperature range is -25 °C to 70 °C; storage from -40 °C to 80 °C.
Compliance documentation
The SENTRON series carries UL, CSA, CE, and IEC certifications per standard Siemens documentation. RoHS and REACH declarations are available from the manufacturer. The 800 V rated insulation voltage aligns with IEC 60947-2 requirements for molded case circuit breakers.