What the ratings mean for fit
The Siemens 3VA1163-4EF36-0KC0 is a 3-pole IEC frame 160 circuit breaker with a 63 A rated current (In) and a breaking capacity of 36 kA at 415 V AC (class S). The 36 kA Icu means it can safely interrupt a fault current up to that level without damage to itself or upstream gear — critical for panel SCCR compliance when the available fault current at the panelboard exceeds 25 kA. The TM240 thermal-magnetic trip unit gives an overload protection range (Ir) adjustable from 44 A to 63 A, so you set it to match the full-load amps of the protected conductor or load, not the breaker's fixed In. Short-circuit pickup (Ii) is adjustable 5 to 10 times In (315 A to 630 A), letting you coordinate downstream with smaller branch breakers or motor starters.
Deployment context
This breaker mounts in a standard IEC panelboard or distribution board on a DIN rail or bolted to a mounting plate via the frame 160 footprint. The clamp connection terminals accept copper or aluminum conductors up to the rated cross-section for the frame size — no lug kit needed for most panel builds. The integrated shunt trip (STL) coil, rated 220-250 V DC or 208-277 V AC, allows remote tripping from an E-stop circuit or fire-alarm relay, which is common in machine-tool and HVAC distribution panels.