The Siemens SENTRON 3VA1020-3ED36-0BA0 is a 3-pole molded case circuit breaker (MCCB) rated for 20 A continuous current, with a TM210 thermal-magnetic overcurrent release. Its interrupting capacity reaches 75.6 kA at 240 V and 52.5 kA at 415 V, making it suitable for high-fault-current distribution panels where selectivity and SCCR headroom are specified. The unit includes an undervoltage release (UVR) — the 3VA9608-0BB11 auxiliary trip — so it can drop the load on loss of control voltage without a separate undervoltage relay.
Current rating and thermal derating
The breaker holds its full 20 A rating from 40 °C up to 50 °C ambient. Above that, the TM210 release begins to derate: 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 hot — say, a sealed enclosure near a furnace line — the continuous load must be trimmed to match the derated curve, or the release may nuisance-trip on a sustained 20 A draw.
Interrupting capacity by system voltage
The interrupting ratings span the common industrial voltages: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at 690 V. For a 480 V panel (common in North America), the 415 V figure is the closest published point — the breaker is designed for IEC distribution, not UL 489北美. If the available fault current at the panel exceeds the rating at the actual system voltage, coordination with an upstream current-limiting fuse or larger-frame MCCB is required.
Physical fit and panel integration
The breaker measures 76.2 mm wide, 130 mm tall, and 70 mm deep. It mounts on a DIN rail or directly to a backplate via the SENTRON 3VA mounting accessories. The IP40 front protection means the operator face is protected against tools and small wires — suitable for enclosed distribution boards, not open-panel washdown areas. No auxiliary contacts are fitted on this variant; if remote status indication is needed, the 3VA9608-0BB11 auxiliary trip is the only integrated switch.