FCRY 3 is a 3 speed fan coil control relay, with 0..10Vdc control input. Adjustable switching voltages and hysteresis. 24 Vac/dc power supply. 3 x 230 Vac 8 A relays. Internal interlocks prevent simultaneous switching. Often used with a room controller.

Relays are interlocked so that only one relay (RL1, RL2 or RL3) can be active at a time. Active relay is indicated by an indicator light (1, 2 or 3).