The Siemens SIRIUS 3UG4614-1BR20 is a network monitoring relay with digital setting, purpose-built for phase monitoring on AC supplies. It checks for phase sequence, phase failure, and asymmetry across a 160-690 VAC range at 50 or 60 Hz. The LCD display shows the measured values and settings, and the relay offers adjustable start-up delay (0.1-20 s) plus auto-reset capability, making it a fit for unattended restart scenarios.
Rated for 160-690 VAC at 50/60 Hz, this relay covers low-voltage networks from 208 V up to 690 V — common in industrial motor control centers and distribution panels. The output contacts are rated 3 A at 250 VAC and 400 VAC (50/60 Hz), and 1 A at 24 VDC, 0.2 A at 125 VDC, 0.1 A at 250 VDC. For a typical PLC or contactor coil load, the 24 VDC 1 A rating is the one to watch; it's enough for a single small contactor but not for paralleling multiple coils without an interposing relay. The adjustable start-up delay (0.1-20 s) lets you ride through momentary dips or back-feed transients during motor starting. With auto-reset enabled, the relay re-energizes the output once the fault clears, which is standard for conveyors or pumps that can restart without manual intervention.
Zero clearance needed on all sides — no ventilation gaps required.