What it is and what it does
The Siemens 3VM1125-3ED26-0AA2 is a 2-pole IEC frame 160 circuit breaker from the 3VM1 series, rated for line protection with a thermal-magnetic TM210 trip unit. Its breaking capacity class N delivers an Icu of 25 kA at 415 V AC — enough for most industrial distribution panels where fault currents stay under that threshold. The overload protection is fixed at Ir = 25 A (not adjustable), and the short-circuit pickup is set at Ii = 12.8 × In, which means it will hold through motor inrush and moderate transformer energization without nuisance tripping.
Deployment context
Mounts on a standard DIN rail inside an IP-rated enclosure. The terminal connection style matches the 3VM1 family footprint, so panel layouts using earlier 3VM1 breakers can swap this in without re-drilling the gland plate or re-routing busbars.