The Siemens 3VA1225-1AA42-0KB0 is a 4-pole switch disconnector from the 3VA1 series, rated at 250 A continuous current on an IEC frame 250.
The 250 A continuous rating (In) governs the main circuit capacity — sized for a 250 A feeder or downstream distribution, not for motor starting duty where overload protection is required separately. The shunt trip release operates on either 208-277 V AC or 220-250 V DC, so it can be wired into a remote trip circuit from a safety relay or emergency-stop chain without an intermediate relay.
Deployment Context
The 4-pole configuration suits three-phase plus neutral disconnection, common in distribution panels for machine tools or process lines where a visible-break disconnect is required for lockout/tagout.