What this breaker carries — and what it means on the line
The Siemens 3VA1125-3EF32-0DC0 is a 3-pole IEC frame 160 molded-case circuit breaker rated 25 A continuous, with a breaking capacity Icu of 25 kA at 415 V AC — class N, which means it handles standard industrial fault levels without needing a larger upstream breaker for most distribution panels. Overload protection uses a TM240 thermal-magnetic trip unit, adjustable from 18 A to 25 A (Ir), so you set it to the exact load current. Short-circuit pickup Ii adjusts from 6.4 to 12.8 times In — 160 to 320 A at the 25 A setting — which lets you coordinate with downstream branch breakers and avoid nuisance trips on motor inrush. An undervoltage release (UVR) coils at 208-230 V AC, 50/60 Hz, and drops the breaker open when supply voltage falls below about 70% of rated — standard for safety interlocks or emergency-stop chains that need a positive disconnect on loss of control power. Two auxiliary switches (HQ type) report breaker position back to a PLC or status lamp — no separate limit-switch wiring needed.
Mounting and integration
The 3VA1 frame accepts DIN-rail or rear-panel mounting; the nut keeper kit (included) secures the breaker in a panel without loose hardware rattling around during transport or vibration.