Circuit Breaker 3VA1125-4EE32-0AA0-ZD00 — IEC Frame 160, 25 A, 36 kA @ 415 V
The Siemens 3VA1125-4EE32-0AA0-ZD00 is a 3-pole IEC frame 160 circuit breaker with breaking capacity class S, rated Icu = 36 kA at 415 V. It is configured for line protection with a TM220 thermal-magnetic trip unit, ATFM (adjustable thermal, fixed magnetic) settings: overload protection Ir adjustable 18 A to 25 A, and short-circuit protection Ii fixed at 12.8 × In (320 A at the 25 A setting). The unit includes a nut keeper kit and is designated for DC Power OEM applications in China.
The 25 A continuous rating with adjustable overload (18–25 A) gives the specifying engineer flexibility to match the exact load current without changing the breaker frame. The fixed magnetic trip at 12.8 × In (320 A) provides instantaneous short-circuit protection; this multiplier is typical for motor-circuit or general-purpose line protection where high inrush must be tolerated without nuisance tripping.
Integration Notes
The nut keeper kit (included per the order code suffix) secures the breaker against vibration in OEM builds — relevant for DC Power OEM installations in China where the part is destined. The 3-pole configuration covers three-phase line protection; verify the neutral conductor protection requirement separately if a 4-pole unit is needed.