Siemens 3VA1020-2ED36-0JA0 — 20 A SENTRON MCCB with shunt trip
The Siemens 3VA1020-2ED36-0JA0 is a 3-pole SENTRON molded case circuit breaker (MCCB) rated 20 A at 40 °C, fitted with a TM210 thermal-magnetic overcurrent release and a factory-integrated shunt trip (STL) for remote opening. Breaking capacity reaches 52.5 kA at 240 V AC, 32 kA at 415 V, and 13.6 kA at 440 V — enough headroom for most secondary distribution boards fed by a transformer of moderate impedance. At 690 V it still interrupts 7.5 kA. That means the 20 A frame is the breaker's identity; if the load grows past 20 A, the whole MCCB gets swapped, not just a trip unit.
Selectivity and coordination
With a 52.5 kA interrupting rating at 240 V and a 20 A continuous frame, this MCCB coordinates well downstream of a larger SENTRON 3VA molded-case or an 3WL air breaker. The TM210's fixed thermal curve means no field-adjustable long-time pickup — selectivity with upstream feeders relies on the manufacturer's published let-through curves, not a dial. The shunt trip (STL) allows a remote trip signal from a safety relay, PLC, or E-stop button — useful for emergency-off circuits or undervoltage protection schemes where a separate undervoltage release is not fitted.
Mounts via rear screw terminals or optional DIN-rail adapter.