The Siemens 3VA1120-6EF36-0KA0 is a SENTRON 3-pole molded case circuit breaker (MCCB) rated for line protection, with a continuous current of 20 A across the 40 °C to 55 °C ambient range and derating to 19 A at 60 °C through 70 °C. Its interrupting capacity reaches 220 kA at 240 V, 154 kA at 415 V, and 121 kA at 440 V — figures that cover high-fault utility and transformer-fed installations where SCCR headroom is a coordination requirement.
The breaker measures 70 mm deep, 76.2 mm wide, and 130 mm high — a 3-pole footprint that fits standard SENTRON 3VA mounting bases and DIN-rail adapters without requiring panel rework from earlier 3VA1 frame sizes. Maximum power loss is 12 W, so thermal dissipation inside a sealed enclosure should be checked against the cabinet's heat budget.