The Siemens 3VA1112-3ED42-0AA0-ZD00 is a 4-pole IEC frame 160 circuit breaker from the 3VA1 series, rated at In=125A with a fixed overload protection setting (Ir=125A) and fixed short-circuit protection at Ii=10 x In. Its breaking capacity class N delivers Icu=25kA at 415V, which means it can safely interrupt fault currents up to that level on a 415V three-phase network without upstream cascading — a key parameter for panel builders sizing the main or feeder breaker in a distribution board.
The 3VA1 frame mounts on DIN rail in a standard panel enclosure. The 4-pole configuration with unprotected neutral (N conductor unprotected) suits IT or corner-grounded delta systems where the neutral is not switched — verify the system grounding before wiring. The nut keeper kit for DC Power OEM in China indicates this variant was kitted for a specific OEM assembly; the keeper secures the breaker's terminal nuts during transport and panel vibration.