The Siemens SENTRON 3VA1120-6EF36-0HA0 is a 3-pole molded case circuit breaker (MCCB) rated for 20 A continuous at 40 °C, with the TM240 thermal-magnetic overcurrent release. Its breaking capacity reaches 220 kA at 240 V, 154 kA at 415 V, and 121 kA at 440 V — figures that put it in the high-interrupting category for line protection in industrial switchgear.
The 20 A rating holds steady from 40 °C up to 55 °C, then derates to 19 A at 60 °C through 70 °C. That's a tight thermal curve — no surprise derating in a warm enclosure, but worth noting if your ambient regularly exceeds 55 °C.
The 3-pole footprint is standard for a 20 A frame — no surprises when swapping into an existing SENTRON 3VA lineup. The shunt trip (STL) is built in, so no external trip module to add.