The RD121 is a 14,400W, 12 channel, rack mount lighting dimmer. It is suitable for church, stage, theater, school, night club, live performances, and other events and artistic applications. Each of the channels has a capacity of 1200W. It is controlled via low voltage signals which may be LMX-128 (3 wire multiplex), or USITT DMX- 512. The unit is fan-cooled. Channels may be independently assigned from the unit. The unit is over-temperature and over-voltage protected and has a magnetic circuit breaker for each channel.
There are several options for channel output connection panels. The RD121 also has several stand-alone functions which enable it to operate without a control console. These functions include a storable scene which may be activated by an external switch closure, a programmable chaser, and 7 factory set chase patterns.