What this breaker brings to the panel
The Siemens 3VA1112-3EF36-0JM0 is a 3-pole IEC molded-case circuit breaker in the 3VA1 series, built on a 160 A frame. It's rated for a 125 A continuous load (In) with a thermal-magnetic TM240 trip unit providing overload protection adjustable from 88 A to 125 A (Ir) and short-circuit protection (Ii) set 5 to 10 times In. The breaking capacity lands at Icu = 25 kA at 415 V, class N — that's the standard interrupting rating for general industrial distribution panels where fault levels stay under that threshold. A shunt trip on the left side (110–127 V AC/DC) allows remote opening, and the package includes two auxiliary switches plus one short-circuit alarm switch for status feedback to a PLC or annunciator.
What the ratings mean for fit
The 125 A continuous rating (In) with an 88–125 A thermal adjust band (Ir) means this breaker covers motor or feeder circuits where the full-load current falls in that window — you dial Ir to match the load without swapping the breaker body. The 25 kA Icu at 415 V is the maximum fault current the breaker can safely interrupt once; for most IEC panelboards fed from a 500 kVA or smaller transformer, that's adequate headroom. The TM240 thermal-magnetic trip offers fixed magnetic pickup at 5–10× In, so it's suited for general-purpose distribution and moderate motor starting where inrush doesn't exceed about 1250 A. Clamp terminals simplify wiring on a DIN-rail or mounting-plate assembly — no lug kit needed for standard cable sizes.