The Siemens 3VA1112-6ED42-0AA0-ZD00 is a 3VA1 IEC frame 160 molded case circuit breaker with a breaking capacity class H — meaning it can interrupt 70 kA at 415 V without damage to itself or downstream gear. Overload protection fixed at Ir=125 A; short-circuit protection fixed at Ii=10 x In. Neutral conductor is unprotected. This variant includes a nut keeper kit and is specified for DC Power OEM applications in China. The nut keeper kit simplifies panel mounting — no loose hardware to drop into live gear during assembly.
That class H rating means it coordinates with upstream switchgear rated for the same fault level — critical for selectivity studies in industrial switchboards. Fixed Ir=125 A and fixed Ii=10 x In means this is a dedicated line-protection breaker, not an adjustable-frame for motor circuits. The nut keeper kit is a small detail but saves time on the panel build.