The 3VA1112-4EF36-0AB0 is a 3-pole IEC frame 160 molded-case circuit breaker with a 125 A continuous current rating and a 36 kA interrupting capacity at 415 V AC — breaking capacity class S. The thermal-magnetic TM240 trip unit gives adjustable overload protection from 88 A to 125 A via the Ir dial, and the short-circuit magnetic pickup Ii is adjustable from 5 to 10 times In (625 A to 1250 A). This lets you coordinate the breaker with downstream loads and upstream protective devices without swapping trip units. The ATAM designation confirms this is a fixed-thermal, adjustable-magnetic trip — standard for motor branch circuit and feeder protection where you need to set the instantaneous pickup above the motor inrush but still protect the cable. The two built-in auxiliary switches (HP) report open/closed status back to the PLC or DCS, which is useful for SIS loop monitoring in a safety-instrumented function where the breaker position must be confirmed on demand.
Where this breaker fits in the panel
The clamp connection accepts copper or aluminium conductors up to the frame's rated cross-section — no lug kit required for most feeder sizes. The two HP auxiliary switches plug into the breaker's accessory slot and share the same compact footprint, so the overall width stays at 3-pole spacing (about 105 mm). For a retrofit into an existing Siemens 3VA lineup, the mounting and busbar connection pattern is consistent across the frame.