Line protection MCCB with shunt trip and auxiliary switches
The Siemens SENTRON 3VA1020-3ED32-0JC0 is a 3-pole molded case circuit breaker rated for 20 A continuous current across the ambient range from 40 °C to 70 °C, with only a 1 A derating at the top end (19 A at 60–70 °C). Its interrupting capacity scales with system voltage: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at both 500 V and 690 V — giving you headroom for high-fault panels in industrial distribution. This variant is configured for line protection (not feeder or motor protection), and it ships with a built-in shunt trip (STL) and two HQ auxiliary switches — so you get remote tripping capability and status feedback without adding external modules. The rated insulation voltage is 800 V, and the maximum power loss is 12 W.
Panel integration and dimensions
The breaker measures 130 mm high, 76.2 mm wide, and 70 mm deep — a standard SENTRON 3VA footprint that fits existing DIN-rail or panel-mount cutouts for the 3VA family. The 3-pole body leaves room for side-mounted auxiliary switch blocks without crowding adjacent devices.