Line protection breaker with TM210 release
The Siemens SENTRON 3VA1020-4ED36-0HA0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, with a rated continuous current Iu of 20 A at 40 °C, holding full 20 A up to 50 °C before derating begins — at 55 °C it's 19.2 A, at 70 °C it's 18 A. The overcurrent release is a TM210 thermal-magnetic type, meaning it combines a thermal bimetal for overload protection and a magnetic coil for short-circuit response, no electronic adjustment needed. Breaking capacity is substantial for its size: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V — figures that cover most low-voltage distribution panels and motor control centers. This breaker does not carry an auxiliary contact, undervoltage release, phase-failure detection, or ground-fault monitoring — it's a bare line-protection device with a shunt trip (STL) as the auxiliary release option.
The 3VA1020-4ED36-0HA0 measures 130 mm high, 76.2 mm wide, and 70 mm deep — a compact footprint for a 3-pole MCCB at this breaking capacity.