The Siemens 3UG4615-2CR20 is a SIRIUS network monitoring relay with digital setting, designed to monitor three-phase AC supplies. It detects phase asymmetry, overvoltage, and phase loss, and provides a delayed-switching output. The LCD display shows the measured values and configuration parameters, making setup straightforward without needing a separate programmer.
Rated for 160 to 690 VAC at 50/60 Hz, this relay covers standard low-voltage networks worldwide — 400 V three-phase is squarely in the middle of the range. The output relay is rated 3 A at 250 V and 400 V (50/60 Hz), 1 A at 24 V, 0.2 A at 125 V, and 0.1 A at 250 V DC; these are the switching currents for the alarm or control circuit, not the load being monitored. The 22.5 mm width and snap-on mounting to DIN rail (any mounting position) mean it fits standard control panel cutouts.
Accepts solid or stranded wire 24–16 AWG (2 x 24–16 AWG for solid). The relay has five selectable functions accessible via the LCD menu, including asymmetry detection and overvoltage detection. Auto-reset is configurable.