The REL15021 is a protection relay designed for medium voltage feeder applications. It offers a wide auxiliary supply range of 24–250V DC and 100–240V AC, making it suitable for diverse substation environments. The relay features eight digital inputs and six digital outputs, including a watchdog function, and supports various protection functions such as overcurrent, overload, earth-fault, broken conductor, and breaker failure protections in accordance with ANSI standards. Additionally, it includes automatic recloser capabilities and supports connection via a temperature module using a twisted shielded pair.

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