This 3VA1 Frame 160 Breaker
The Siemens 3VA1112-5GF42-0AA0-ZD00 is a 3VA1 IEC frame 160 molded-case circuit breaker, breaking capacity class M rated Icu=55kA @ 415V, 4-pole. It carries a TM240 thermal-magnetic trip unit with ATAM (adjustable thermal, adjustable magnetic) — overload protection Ir adjustable from 88A to 125A, short-circuit protection Ii adjustable 5...10 x In. N-conductor protection is set at 100%. Includes a nut keeper kit for DC Power OEM applications, specified for builds in China.
What the Ratings Mean for Fit
55 kA Icu at 415 V is the ultimate short-circuit breaking capacity — the breaker can safely interrupt a fault at that level once and still carry rated current afterward (no need to replace after a single fault). The class M designation sits between standard (S) and very high (H) in the 3VA line, giving you selectivity headroom for downstream distribution panels without overspending on the H frame. The 4-pole configuration with 100% N protection means the neutral conductor is switched and protected at the same rating as the phases — required for TN-C-S or TT systems where the neutral is a current-carrying conductor, not just a reference.
Panel Integration & Wiring
DIN-rail or screw-mount compatible within the 3VA1 frame footprint. The nut keeper kit (included) secures the DC Power OEM variant to the mounting plate — verify the gland plate clearance for the 4-pole width before laying out the enclosure. Spring-cage or box-lug terminals accept copper conductors sized for 125A continuous; torque per the terminal marking on the breaker face.