The Siemens 3VA1225-5EE32-0AA0-ZD00 is a 3-pole IEC frame 250 molded case circuit breaker rated at 250 A continuous current with a breaking capacity of 55 kA at 415 V (class M). It carries a TM220 thermal-magnetic trip unit — overload protection adjustable from 175 A to 250 A, and fixed short-circuit protection at 10 x In (2500 A). The suffix ZD00 indicates a nut keeper kit included, configured for a DC Power OEM in China.
What the Ratings Mean for Fit
The 55 kA Icu at 415 V puts this in the 'M' (medium) breaking capacity class — enough for most industrial distribution panels where the prospective fault current stays under that threshold. The TM220 thermal-magnetic trip gives adjustable overload protection (Ir = 175–250 A) and a fixed magnetic pickup at 10 x In, so it's suited for feeder or large motor circuits where inrush won't nuisance-trip the instantaneous element. The nut keeper kit (ZD00) is a mechanical accessory for secure mounting in OEM builds — not a functional electrical difference.