The Siemens SENTRON 3VA1112-3EF36-0JC0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying 125 A continuous current at 40 °C ambient. The TM240 thermal-magnetic release handles overload and short-circuit protection without an external trip unit. Breaking capacity runs 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 10.5 kA at 690 V — so the 415 V figure is the one that governs most European 400 V panel designs. Panel footprint is 76.2 mm wide by 130 mm tall by 70 mm deep, which matches the standard SENTRON 3VA mounting pattern.
Thermal derating and ambient limits
Rated current holds at 125 A up through 50 °C ambient. Above that it steps down: 120 A at 55 °C, 117.5 A at 60 °C, 115 A at 65 °C, and 112.5 A at 70 °C. If the panel runs hot — say a packed enclosure near a drive — the 55 °C figure is the one to size against. Operating ambient range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The storage max is a handling limit, not a running spec.
Integrated accessories and wiring
This version ships with a shunt trip (STL) auxiliary release — order code 3VA9688-0BL32 for the trip coil itself. It also carries 2 auxiliary switches HQ for remote status indication. No undervoltage release, no ground-fault monitoring, no communication module. The front face is IP40 rated — fine for a closed panel, not for washdown. The shunt trip is voltage-triggered, so verify the control voltage matches your trip circuit before wiring.