What this breaker is and what the ratings mean
The Siemens 3VA1125-5ED32-0AA0-ZD00 is a 3-pole IEC frame 160 molded case circuit breaker configured for line protection with a fixed thermal-magnetic trip unit (TM210, FTFM). The In rating is 25 A, with overload protection Ir fixed at 25 A and short-circuit protection Ii set at 12.8 x In — that is 320 A magnetic pickup. The breaking capacity class M delivers Icu = 55 kA at 415 V AC, which means it can safely interrupt a fault current up to that level without damage to itself or cascading failure upstream in the distribution panel. This is a standard IEC 60947-2 device, so the 55 kA rating is the ultimate short-circuit breaking capacity — the maximum fault the breaker can clear once and remain functional afterward.
Deployment context and panel integration
This breaker mounts in a standard distribution panel or motor control center on a DIN rail or bolted to a mounting plate, depending on the 3VA1 frame accessories selected. The nut keeper kit noted in the description (for DC Power OEM in China) suggests the unit ships with hardware intended for a specific OEM assembly — verify the kit contents if you are integrating into a standard Siemens 3VA1 panelboard rather than a captive OEM build. The 3-pole configuration suits three-phase line protection for feeders, branch circuits, or downstream sub-distribution.