What this MCCB carries and where it fits
The Siemens SENTRON 3VA1140-5EF36-0DC0 is a 3-pole molded case circuit breaker (MCCB) rated 40 A continuous at 40 °C, designed for line protection in distribution panels and motor control centers. Its headline breaking capacity hits 187 kA at 240 V AC — that is the fault current it can safely interrupt without welding contacts or venting arc gas into the enclosure. At 415 V it still holds 121 kA, dropping to 75.6 kA at 440 V and 17 kA at 500 V and 690 V, so the SCCR you need drives which voltage tap you spec against. Thermal derating is mild: the breaker holds 40 A up to 50 °C ambient, then steps down to 39 A at 55 °C, 38 A at 65 °C, and 37 A at 70 °C. That means in a warm panel — say a packed MCC bucket near other heat sources — you lose only 3 A at the top of the operating range. The insulation voltage is rated 800 V, giving headroom for 480 V and 600 V class systems without de-rating the dielectric. Power loss at full load is 13.3 W, which matters for panel thermal budgeting when several breakers sit side by side. Dimensions are 70 mm deep, 76.2 mm wide, 130 mm high — a standard 3-pole MCCB footprint that fits most Siemens and third-party distribution blocks without re-drilling.
Auxiliary hardware and integration
This variant ships with an undervoltage release (UVR) and two auxiliary switches HQ. The UVR trips the breaker when control voltage drops below a set threshold — standard for emergency-stop circuits that need a guaranteed open on loss of control power. The two HQ auxiliary switches provide status feedback (open/closed) to a PLC or panel indicator, one normally open and one normally closed contact set per switch. No communication function is built in; this is a hard-wired protection device, not a smart breaker. The base switch is order code 3VA11405EF360AA0, so if you are replacing the internal mechanism on an existing install, that is the sub-assembly number. No trip indicator, no voltage trigger, and no ground-fault monitoring on this version — it is a straight thermal-magnetic line-protection MCCB with undervoltage release.