SENTRON 3VA1020-3ED32-0AC0 — 20 A MCCB for Line Protection
The Siemens 3VA1020-3ED32-0AC0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a 20 A rating at 40 °C and holds that rating through 55 °C before derating to 19 A at 60 °C — useful to know if the breaker sits near other heat sources in a crowded enclosure. Breaking capacity is 75.6 kA at 240 VAC, 52.5 kA at 415 VAC, and 32 kA at 440 VAC. At 500 V and 690 V it holds 7.5 kA. The 3-pole construction with a TM210 thermal-magnetic release suits it for feeder circuits where you need adjustable thermal and fixed magnetic trip coordination. Rated insulation voltage is 800 V, and maximum power loss is 12 W. The breaker includes two HQ auxiliary switches for status feedback — no undervoltage release, no ground-fault monitoring, and no communication function. It ships without a trip indicator or voltage trigger.
Integration and Mounting
The breaker measures 70 mm deep, 76.2 mm wide, and 130 mm high — a standard 3-pole MCCB footprint that fits SENTRON panel-mounting systems and DIN-rail adapters. The 2.76 in × 3 in × 5.12 in dimensions confirm compatibility with existing cutouts in retrofit panels. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The 12 W maximum power loss should be factored into enclosure thermal calculations, especially when grouping multiple breakers.