SENTRON 3VA1120-5EF32-0AF0 — 20 A MCCB with TM240 release
The Siemens SENTRON 3VA1120-5EF32-0AF0 is a 3-pole molded case circuit breaker rated for 20 A continuous current at 40 °C, using a TM240 thermal-magnetic overcurrent release. Short-circuit breaking capacity runs 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 690 V — numbers that put this squarely in high-rupturing-capacity territory for a 20 A frame. If your panel SCCR requirement sits at 65 kA at 480 V, this breaker clears it with headroom to spare.
Above that it derates linearly: 19.2 A at 55 °C, 18.8 A at 60 °C, 18.4 A at 65 °C, and 18 A at 70 °C.
Auxiliary contacts and compliance
If you need those, the 3VA platform supports them as add-on modules, but this order code ships clean. The part carries the SENTRON brand and is designed to meet IEC 60947-2 (the MCCB standard) — compliance documentation (declaration of conformity, CE, UKCA) is available from Siemens on request.