Siemens AG Protection Relays & Systems 3UG4615-1CR20

The 3UG4615-1CR20 is a digital 3-phase voltage monitoring relay for AC supply voltages from 160 to 690 V at 50 to 60 Hz, detecting undervoltage, overvoltage, phase failure, phase sequence, and asymmetry. It has two changeover contacts rated for 5 A thermal current and 3 A at 250 V AC-15. The relay uses snap-on mounting with dimensions of 92 mm height, 22.5 mm width, and 91 mm depth, and screw terminals for conductors from 0.5 to 4 mm² solid or 0.5 to 2.5 mm² stranded. Operating temperature ranges from -25 to +60 °C, with an IP20 protection rating. Galvanic isolation is provided between input, output, and supply circuits. It features an LCD display, 1% relative repeat accuracy, and a 6 kV surge voltage resistance.