Interrupting capacity and thermal-magnetic release
The Siemens SENTRON 3VA1050-4ED32-0CC0 is a 3-pole molded case circuit breaker (MCCB) rated for 50 A continuous current at 40 °C, with a TM210 thermal-magnetic overcurrent release. Its interrupting capacity is 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V — the 121 kA figure at 240 V is the headline number that determines fault-clearing capability at the service entrance or main distribution panel. The breaker carries 50 A through 50 °C, then derates to 48 A at 55 °C, 47 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C — relevant for panel builders who need to account for internal enclosure temperature rise.
Undervoltage release and auxiliary contacts
The integrated auxiliary trip is order code 3VA9608-0BB24. Two auxiliary switches (HQ version) are built in, providing status feedback for the breaker's open/closed and tripped states.