The Siemens SENTRON 3VA1112-5EF36-0AG0 is a 3-pole molded case circuit breaker (MCCB) rated 125 A at 40 °C with a TM240 thermal-magnetic release, designed for line protection in distribution panels.
This MCCB delivers 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V (–). The TM240 release provides thermal and magnetic trip curves matched to cable and transformer protection.
Current derating and thermal budget
Above 50 °C it derates: 122 A at 55 °C, 120 A at 60 °C, 117 A at 65 °C, 114 A at 70 °C (–). Maximum power loss is 28.1 W — factor that into enclosure ventilation, especially when grouping multiple breakers.
Built-in auxiliary switching and trip indication
Factory-fitted with 1 auxiliary switch and 1 trip alarm switch — no separate order for signal contacts. The trip indicator gives local visual status.
