What this MCCB delivers
The Siemens 3VA1020-3ED36-0AA0 is a SENTRON molded case circuit breaker rated 20 A continuous at 40 °C, with a TM210 thermal-magnetic release that provides adjustable short-circuit pickup up to 320 A. Its 75.6 kA interrupting capacity at 240 V AC means it can safely clear high-fault currents on a 240 V distribution bus without upstream coordination issues — a key spec for panel builders needing high SCCR in a compact footprint. Rated insulation voltage is 800 V, so it handles 480 V and 600 V class systems comfortably. The 3-pole design suits three-phase line protection in switchboards, motor control centers, and feeder panels.
Integration notes
Mounts on a standard DIN rail or panel-mount base. Dimensions: 70 mm deep, 76.2 mm wide, 130 mm tall — fits the 3VA family cutout. Front IP40 protection keeps out tools and finger probes; the enclosure is not rated for washdown, so keep it inside a panel. The TM210 release is field-adjustable for short-circuit pickup (li max 320 A), but the thermal element is fixed at 20 A. No communication module or ground-fault monitoring on this variant — it is a straight thermal-magnetic line protection breaker.
Breaking capacity across voltages
Interrupting ratings drop 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 500 V and 690 V. At 500 V DC the maximum rated operational voltage is 500 V DC — check the 3VA DC manual for DC switching limits.