The Siemens SENTRON 3VA1225-1AA32-0BB0 is a 3-pole switch disconnector in the 3VA1 IEC frame 250, rated at 250 A continuous current. It is configured as an SD100 — a basic disconnect without integral overload or short-circuit protection elements. The unit ships with an undervoltage release (24 V DC) and two auxiliary changeover switches fitted.
The 250 A continuous rating (In) sets the maximum uninterrupted load this disconnector can carry under normal service conditions. Because the SD100 variant omits overload and short-circuit protection, it functions purely as an isolating device — the upstream feeder breaker or motor circuit protector must provide the overcurrent protection. The 3-pole configuration suits three-phase line or load isolation in distribution panels, motor control centers, or switchgear assemblies.
Integration notes
The undervoltage release coil draws 24 V DC; verify the control transformer and wiring polarity before energizing.