The Siemens 3VA1112-3EF36-0AH0 is a 3-pole SENTRON molded case circuit breaker rated 125 A continuous at 40 °C through 50 °C, with a TM240 thermal-magnetic release and a 52.5 kA interrupting capacity at 415 V AC. The 125 A rating holds flat across 40 °C to 50 °C ambient; above that it derates to 114 A at 70 °C, which matters if the breaker sits in a warm enclosure near other heat sources.
The 3VA1112-3EF36-0AH0 measures 70 mm deep, 76.2 mm wide, and 130 mm tall — a 3-inch wide, 5.12-inch high form factor that fits the standard SENTRON 3VA1 panel cutout. It mounts via screw-on lugs to a backplate or DIN-rail adapter plate; the 3-pole width is the same as other 3VA1 125 A frames, so swapping in a panel originally wired for a 3VA1110-5ED36-0AC0 requires no busbar or lug relocation — same mounting centers, same line/load connection pattern.
Release and auxiliary configuration
A mechanical trip indicator is built in for local visual fault indication.