The Siemens SENTRON 3VA1120-3EF36-0DC0 is a 3-pole molded case circuit breaker (MCCB) rated 20 A at 40 °C, with a breaking capacity of 75.6 kA at 240 V AC.
With 75.6 kA at 240 V and 52.5 kA at 415 V, this MCCB handles high fault currents typical of main feeders. The interrupting rating drops to 32 kA at 440 V and 11.9 kA at 500 V or 690 V, so verify the available fault current at your system voltage before specifying.
Current derating across temperature
The breaker holds 20 A continuously from 40 °C through 55 °C, then derates to 19 A at 60 °C through 70 °C.
Auxiliary and undervoltage release
Two HQ auxiliary switches are built in, plus an undervoltage release (UVR).
Width 76.2 mm (3 in), depth 70 mm (2.76 in), height 130 mm (5.12 in). The 3-pole footprint matches the SENTRON 3VA family, so a panel cutout for a 3VA1110 or 3VA1020 will accept this unit without rewiring the bus bars.