Breaking capacity across the voltage range
The 3VA1020-4ED36-0DC0 is a 3-pole SENTRON molded case circuit breaker rated for line protection at 20 A continuous, fitted with a TM210 thermal-magnetic release. Its interrupting capacity climbs to 121 kA at 240 V, drops to 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V — so on a 400 V distribution board you get the full 75.6 kA headroom, but if the same breaker lands in a 690 V motor centre, that 11.9 kA figure is the one that governs SCCR compliance. The thermal derating curve holds a flat 20 A from 40 °C through 50 °C, then steps down: 19.2 A at 55 °C, 18.8 A at 60 °C, 18.4 A at 65 °C, and 18 A at 70 °C. If the panel ambient runs at 55 °C, plan for the 19.2 A ceiling — no need to oversize the breaker, just don't load it to the nameplate.
DIN-rail footprint and auxiliary complement
The breaker measures 76.2 mm wide, 130 mm tall, and 70 mm deep — a standard 3-pole MCCB footprint that drops into a SENTRON distribution panel or any DIN-rail enclosure with the matching busbar adapter. It ships with two auxiliary switches (HQ type) fitted, and an undervoltage release (UVR) is built in; the integrated auxiliary trip order code is 3VA9608-0BB25. The front face carries an IP40 protection class, so it's fine for a clean indoor panel but not for washdown areas.