The General Electric RR9 is a low-voltage pilot light remote control relay used for lighting and control circuits. It is a single-pole, single-throw (SPST) maintained relay with an isolated pilot contact that opens and closes line-voltage circuits using momentary low-voltage control pulses. The relay is typically rated around 20 amps at 277 volts and is designed for easy installation in standard electrical boxes. It can replace older GE pilot light relays such as RR4, RR6, and RR8 and is commonly used in commercial lighting control systems. The RR9 maintains its contact state mechanically, so it does not require continuous power to the coil.