The Siemens SIRIUS 3UG4614-2BR20 is a network monitoring relay with digital setting, designed to monitor AC phase parameters in three-phase systems. It covers a rated voltage range of 160 to 690 V AC at both 50 and 60 Hz, making it suitable for standard industrial mains across most regions. The relay detects phase asymmetry and includes an auto-reset function, with a configurable start-up delay from 0.1 to 20 s to ride through momentary dips. Switching capacity is rated at 3 A at 250 V and 400 V AC (50/60 Hz), with lower ratings for DC loads: 1 A at 24 V, 0.2 A at 125 V, and 0.1 A at 250 V. The output relay provides a changeover contact, and isolation between outputs is confirmed. Clearance around the device is 0 mm in all directions, meaning it can be packed tightly against other components without derating. The front panel includes an LCD display for parameter readout, but no LED bar graph.
Wiring & Termination
The screw-type clamps are sized for standard control wiring; strip length and torque follow Siemens recommendations. The relay's output is a single changeover contact rated for general-purpose AC loads; for DC switching, derate per the listed values.