Siemens AG Protection Relays & Systems 3UG4617-1CR20

The 3UG4617-1CR20 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, sequence errors, and asymmetry. It has two changeover (CO) relay contacts for phase correction and fault signaling, with adjustable OFF delays from 0.1 to 20 s. The relay operates from a 160-690 V AC control supply and provides galvanic isolation between input, output, and power circuits. Screw-type terminals accept solid conductors from 0.5 to 4 mm² or finely stranded conductors up to 2.5 mm², with a torque of 0.8-1.2 N·m. The device is mounted via snap-on rail, measuring 92 mm high, 22.5 mm wide, and 91 mm deep. It operates from -25 to +60 °C, is rated for 2000 m altitude, and meets IP20 protection. Electrical endurance is 100,000 cycles at AC-15, 230 V, and relative repeat accuracy is 1%.