The Siemens SIRIUS 3UG3511-1AQ50 is a 22.5 mm monitoring relay that checks phase sequence and phase failure on three-phase supplies from 3x200 V to 3x460 V AC at 50/60 Hz. It switches a single changeover contact when the sequence is wrong or a phase drops out — the kind of fault that kills a motor winding before the operator notices. IP20 finger-safe terminals; screw connection, snap-on DIN rail mount.
If you are sourcing against an RFQ, the supply posture is standard production; quoted to order with no last-time-buy pressure.
The 3x200...3x460 V AC range covers the common 230/400 V and 240/415 V three-phase networks. At 50/60 Hz it works on both industrial mains frequencies without a configuration change. The single changeover contact is rated for the control circuit, not the motor power — you feed the contactor coil through it, not the load. The 22.5 mm width fits alongside a standard miniature circuit breaker or contactor without crowding the rail.