Breaker profile and what the ratings mean for fit
The Siemens 3VA4125-5ED34-3AA0 is a 3-pole molded case circuit breaker in the 3VA4 family, built on a UL Frame 125 chassis. Its headline numbers: a 35 kA interrupting capacity at 480 V AC (breaking capacity class M), and a TM210 thermal-magnetic trip unit set for line protection. The thermal element is fixed at Ir = 25 A overload protection — no field adjustment, so the breaker is sized for a continuous load that stays under that mark. The magnetic instantaneous pickup is fixed at Ii = 12 x In, meaning it holds through motor inrush and trips on a hard short. That 35 kA SCCR at 480 V tells you it can clear a fault up to that level without the upstream device having to intervene — useful for panel coordination where the available fault current is known to be in that range.
Panel integration and deployment context
The 3VA4 frame mounts into standard panel-mount cutouts or can be fitted with rotary-handle or motor-operated mechanisms for remote switching. At 35 kA @ 480 V, this breaker is sized for distribution panels in commercial or light industrial settings — think feeder protection, branch circuits feeding motor control centers, or main breakers in a sub-panel where fault current is moderate. The fixed Ir means the load profile must be known at design time; no dialing it up later if the load grows. The packaging dimensions (472 x 396 x 213 mm) give a sense of the shipping box, not the breaker itself — the frame is smaller, but the made-to-order packaging is sized for single-unit shipment.