Panel fit and ratings
The 3VA1120-3EF32-0JC0 is a 3-pole SENTRON molded case circuit breaker sized for line protection duty. Rated 20 A continuously at 40 °C ambient, it derates to 19 A above 60 °C — a curve worth checking if the panel runs hot. Breaking capacity hits 75.6 kA at 240 V, 52.5 kA at 415 V, and 32 kA at 440 V; at 500 V and 690 V it holds 11.9 kA. That covers most industrial service-entrance and feeder applications within a 480Y/277 V or 400 V distribution system. The 70 mm depth and 76.2 mm width fit standard Siemens 3VA mounting bases — no panel rework if swapping from an earlier 3VA frame.
Integrated accessories
This variant ships with a shunt trip release (STL) and two auxiliary switches HQ factory-installed — no field retrofit needed. The shunt trip allows remote tripping from a PLC or emergency-stop circuit, while the aux switches provide status feedback for the panel controller. No undervoltage release or ground-fault monitoring on this build; those are separate order-code variants. The supplied basic switch is 3VA11203EF320AA0, so replacement of the switching mechanism alone is possible without replacing the entire breaker.