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

The AR-3-1-1 is a three-phase current protection relay designed for motor, genset, transformer, and ground fault protection, with selectable over-current, under-current, and current unbalance detection. It features a nominal current setting range of 1 A to 5 A, adjustable trip points for over- and under-current (30-140% and 10-95% of nominal, respectively), and variable time delays up to 10 seconds. The relay supports auto or manual reset via a front key, includes True RMS measurement up to the 15th harmonic, and provides LED indicators for power, over-current, under-current, and unbalance faults. It operates on an auxiliary supply of 60-300 V AC/DC, has IP20 front-face protection, and uses a 1CO relay contact configuration rated at 5 A/250 V AC or 30 V DC. The unit meets IEC 61010-1-2010 safety standards and IEC 60529 for environmental protection, with an operating temperature range of -10 to +55°C and a weight of approximately 175 g.