The Siemens SENTRON 3VA1120-4EF36-0AB0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current of 20 A at 40 °C with a TM240 thermal-magnetic release. Its interrupting capacity reaches 121 kA at 240 V and 75.6 kA at 415 V, making it a fit for high-fault panels where upstream coordination demands a robust SCCR.
Interrupting capacity and thermal derating
At 440 V the breaker clears 52.5 kA; at 500 V and 690 V it holds at 11.9 kA. The thermal curve holds 20 A flat from 40 °C through 55 °C, then derates to 19 A at 60 °C and 70 °C. That means the breaker does not lose ampacity until the ambient passes 55 °C — useful in a tightly packed panel where internal temperature runs high.
The 3-pole footprint matches standard SENTRON 3VA1 MCCB cutouts; if you are swapping a 3VA1110-5EF32-0AM0, the width and depth are identical, so no re-drilling or bus-bar rework is needed.