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.
Key Ratings and Fit
The 36 kA breaking capacity at 415 V (Icu) places this breaker in the class S range, suitable for installation at points where the prospective short-circuit current reaches that level — typically downstream of a transformer or in a main distribution board. 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 3VA1 frame 160 breaker mounts on a standard DIN rail or can be screw-fixed to a mounting plate in the enclosure. 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.