Rishabh Instruments Pvt. Ltd. Protection Relays & Systems AR-3-2-1

The AR-3-2-1 is a three-phase current protection relay with two normally energized relay outputs, designed to monitor overload, locked rotor, ground fault, and current unbalance conditions. It accepts a settable nominal input current of 1 A to 5 A, with adjustable overcurrent and undercurrent trip points from 30-140% and 10-95% respectively. A fixed 20% unbalance trip point is enabled for three-phase operation. True RMS measurement covers harmonics up to the 15th. Trip delays are adjustable between 0 and 10 seconds, with a fixed 1-second reset delay. It operates on 60-300 V AC/DC auxiliary supply, with less than 3 VA burden. Relay contacts are rated at 5 A/250 V AC or 30 V DC, with mechanical endurance of 10^7 operations. The unit meets IEC 61010-1-2010, has an IP20 enclosure, and operates from -10°C to +55°C. Weight is approximately 175 g.