What this MCCB carries
The Siemens SENTRON 3VA1020-3ED36-0KC0 is a 3-pole molded case circuit breaker (MCCB) rated 20 A continuously at 40 °C, with a 75.6 kA interrupting capacity at 240 V — enough to handle most distribution panel fault currents without cascading upstream. It is a line-protection device, meaning it is sized for feeder or branch circuits rather than motor-starting duty.
Breaking capacity across voltages
Interrupting capacity drops as voltage rises: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at both 500 V and 690 V. That 7.5 kA at 690 V is the floor — verify the available fault current at your system voltage before specifying.
Thermal derating and operating range
The breaker holds 20 A from 40 °C up to 55 °C, then derates to 19 A at 60 °C through 70 °C. Operating ambient is -25 °C to 70 °C, storage from -40 °C to 80 °C. Maximum power loss is 12 W.
Integrated accessories
This variant includes a shunt trip (STL) for remote tripping and two auxiliary switches (HQ) for status feedback. No undervoltage release, no ground-fault monitoring, no communication module. Insulation voltage rated 800 V.