What this breaker is and what the ratings mean for fit
The Siemens 3VA1112-3ED32-0AA0-ZD00 is a 3-pole IEC frame 160 molded case circuit breaker from the 3VA1 series, rated In=125A with a TM210 thermal-magnetic trip unit — fixed overload protection at Ir=125A and fixed short-circuit protection at Ii=10 x In (1250A). The breaking capacity class N delivers Icu=25kA at 415V, which means it can safely interrupt a fault current up to 25,000A at that voltage without damage to itself or upstream gear; this is the rating that governs selectivity coordination in a distribution panel. The FTFM trip has fixed Ir=125A and Ii=10 x In (1250A). The nut keeper kit suits DC Power OEM applications in China.
Deployment context
This breaker mounts in a standard distribution panel on a DIN rail or bolted to a mounting plate — the 3VA1 frame is designed for panelboard integration with optional busbar connections. The 3-pole configuration suits three-phase loads: motor branch circuits, feeder distribution, or inverter input protection where the 125A fixed overload matches the continuous current.