The Siemens 3VA1163-3EF36-0AF0 is a 3-pole IEC molded-case circuit breaker from the 3VA1 series, built on a 160 A frame with a 63 A rated current (In). It carries a 25 kA ultimate breaking capacity (Icu) at 415 V AC, which is the class N rating — sufficient for most secondary distribution panels and downstream feeder protection in commercial and light industrial installations. The breaker is fitted with a TM240 thermal-magnetic trip unit: the thermal overload protection (Ir) is adjustable from 44 A to 63 A, and the magnetic short-circuit pickup (Ii) is adjustable from 5 to 10 times In (315 A to 630 A). This adjustability lets the panel builder coordinate selectivity with upstream devices without changing the breaker itself.
What the ratings mean for fit
The 25 kA Icu @ 415 V tells you the breaker can safely interrupt a fault up to that level without failing — critical for verifying SCCR on the panel nameplate. The 160 A frame means the breaker body and bus connections are physically sized for conductors up to that ampacity, even though the trip unit is set to 63 A; this gives headroom if you later need to uprate the trip coil. The TM240 trip is a fixed thermal-magnetic design — no electronic adjustment, no communication module — so it is a straight replacement for older Sentron or 3VL breakers in the same footprint. The clamp (box lug) terminals accept aluminum or copper conductors without compression lugs.