Overview
The REL21707 is a Schneider MiCOM P127 voltage/current protection relay rated 1 A, operating on a 250 V DC supply, with 4 current inputs (CT...X/5 A and X/1 A), 3 voltage inputs, and 12 discrete inputs, plus 9 discrete outputs. It supports DNP3, Modbus RTU, and IEC 60870-5-103 protocols, and is flush-mounted with a total depth of 270 mm and an embedded depth of 240 mm.
Comparison with REL21201
Compared to the REL21201, the REL21707 adds 3 voltage inputs and 12 discrete inputs versus 3 discrete inputs, and 9 discrete outputs versus 7, making it the choice when voltage measurement and additional I/O are required for feeder protection.
Lifecycle and sourcing
Schneider has discontinued the REL21707; remaining units are sourced through surplus and broker channels. An RFQ confirms available quantity and lead time for line-down or last-time-buy needs.