125 A MCCB with 52.5 kA interrupting capacity at 415 V
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. That SCCR figure governs fault clearing in 400 V class distribution — 52.5 kA at 415 V means this breaker can interrupt a fault up to that level without upstream fuses needing to clear, simplifying coordination in a main or feeder panel. 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.
Footprint and panel fit
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
The TM240 thermal-magnetic release provides fixed thermal and magnetic trip settings for line protection — no adjustable magnetic pickup. The breaker ships with 2 auxiliary switches plus 1 trip alarm switch (HQ type), giving three dry contacts for status feedback to a PLC or annunciator panel. A mechanical trip indicator is built in for local visual fault indication. Rated insulation voltage is 800 V, and maximum power loss at rated current is 28.1 W.