The Siemens SENTRON 3VA1020-3ED36-0CC0 is a 3-pole molded case circuit breaker (MCCB) rated for 20 A at 40 °C, with a breaking capacity of 75.6 kA at 240 V AC.
Breaking capacity and thermal derating
Breaking capacity drops as voltage climbs: 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at both 500 V and 690 V. Thermal rating holds steady at 20 A from 40 °C through 55 °C, then drops to 19 A at 60 °C and 65 °C, and stays at 19 A through 70 °C. No derate below 55 °C simplifies panel sizing in most industrial environments — you don't lose headroom until the ambient pushes past that mark.
Undervoltage release and auxiliary switches
It also carries two auxiliary switches (HQ design) for status feedback back to the PLC or annunciator.