What it is and what it does
The Siemens SENTRON 3VA1020-2ED36-0KA0 is a 3-pole molded case circuit breaker (MCCB) rated 20 A at 40 °C, designed for line protection in industrial distribution panels. Its 52.5 kA interrupting capacity at 240 V means it can safely clear high-fault currents without upstream coordination issues — critical when the panel feeds motor starters or downstream sub-distribution.
Key ratings and what they mean for fit
Rated current holds at 20 A from 40 °C up to 55 °C, then derates to 19 A at 60–70 °C — so in a warm enclosure (say, 55 °C ambient) you still get full 20 A continuous without nuisance tripping. Breaking capacity steps down with voltage: 52.5 kA at 240 V, 32 kA at 415 V, 13.6 kA at 440 V, and 7.5 kA at 500/690 V. That 7.5 kA at 690 V is the figure to check if your panel feeds a 690 V drive bus. The overcurrent release is a TM210 thermal-magnetic type — fixed thermal and magnetic settings, no electronic adjustment. The auxiliary release is a shunt trip (STL), so you can remotely trip the breaker via a control signal. No undervoltage release, no ground-fault monitoring, no communication function on this variant.
Panel integration and dimensions
Mounts on a DIN rail or panel-mount base. Dimensions: 130 mm height, 76.2 mm width (3 in), 70 mm depth (2.76 in). The 3-pole footprint is standard for 20 A MCCBs — verify the busbar spacing and enclosure cutout against your existing layout. Operating temperature range -25 °C to 70 °C; storage -40 °C to 80 °C.