What this MCCB delivers in the panel
The Siemens SENTRON 3VA1120-3EF36-0KH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection in distribution panels. It carries a continuous current of 20 A at 40 °C, derating to 19 A at 60 °C and above — a thermal curve worth checking if the breaker sits near other heat sources in a crowded enclosure. Breaking capacity is the headline number here: 75.6 kA at 240 V AC, 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at both 500 V and 690 V. That 75.6 kA at 240 V gives substantial fault-current headroom for North American 240/120 V split-phase or 240 V delta services; the 52.5 kA at 415 V covers most European 400 V distribution without needing a current-limiting upstream device. Rated insulation voltage is 800 V, so the breaker is electrically rated for 690 V systems with margin. Power loss at rated load is 12 W maximum — a moderate figure that factors into enclosure thermal calculations when grouping several breakers.
Integrated accessories and wiring
This variant ships with a shunt trip (STL) release and a complement of two auxiliary switches plus one trip alarm switch (HQ). The shunt trip allows remote tripping from a PLC or emergency-stop circuit; the auxiliary switches provide status feedback for the breaker position (open/closed), and the trip alarm signals a fault trip distinct from manual opening. No undervoltage release is fitted — if UVR protection is needed, this is not the variant. The breaker includes a voltage trip indicator and a mechanical trip indicator, giving clear local status. No communication function or ground-fault monitoring is built in; this is a straightforward line-protection device without integrated metering or Modbus. Dimensions are 130 mm height, 76.2 mm width, 70 mm depth — a standard 3-pole MCCB footprint that fits Siemens 3VA panelboards and most DIN-rail adapter kits. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.