Siemens 3VA1020-3ED36-0JA0 — 20 A MCCB with TM210 Release
The Siemens SENTRON 3VA1020-3ED36-0JA0 is a 3-pole molded case circuit breaker (MCCB) rated for 20 A continuous current, using a TM210 thermal-magnetic overcurrent release. It's built for line protection — the core job of clearing overloads and short circuits in a distribution panel without taking out upstream gear. The interrupting ratings climb with system voltage: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and still 7.5 kA at 690 V. That's enough SCCR headroom for most industrial secondary distribution — a 240 V panel with a 65 kA available fault current is comfortably covered, and the 415 V figure handles heavy European-style networks. Thermal derating is minimal up to 50 °C — the breaker holds its full 20 A rating. Past that it drops gradually to 18 A at 70 °C, which is the maximum operating ambient. If the panel runs hot near a furnace or in a sealed enclosure, that derating curve matters for the BOM line.
Panel Fit and Integration
Footprint is 76.2 mm wide by 130 mm tall by 70 mm deep — a standard 3-pole MCCB slice that fits most DIN-rail or backplate layouts without surprises. The IP40 front protection means the breaker face is sealed against tools and fingers; the rest of the body is open for heat shedding inside the enclosure. This version comes with a shunt trip (STL) release fitted — order code 3VA9688-0BL32 for the integrated auxiliary trip. No undervoltage release, no auxiliary contacts, no ground-fault monitoring on this variant. If the panel spec calls for those, you'd step to a different suffix.