The Siemens 3VA1112-4ED42-0AA0-ZD00 is a 4-pole IEC frame 160 circuit breaker from the 3VA1 series, rated for line protection with a TM210 thermal-magnetic trip unit. The overload protection Ir is fixed at 125A, and the short-circuit protection Ii is set at 10 x In. Its breaking capacity class S delivers an Icu of 36kA at 415V, which means it can safely interrupt fault currents up to that level on a 415V three-phase system without upstream cascading — a key figure for panel coordination.
This breaker is designed for DIN-rail mounting in a standard control panel enclosure. The 4-pole configuration suits three-phase plus neutral applications, though the N conductor is unprotected on this variant. The nut keeper kit included is an OEM-specific addition for DC Power applications in China — confirm fit with your panel layout before specifying.