The CRC4214 0-10V Dimming Control Unit (4) provides 4 independent channels for dimming control of flourescent ballasts and LED converters that accept the 0-10VDC dimming standard. There are high and low trim functions for each output that can restrict the maximum and minimum light levels. When the device loses databus (power) an internal relay automatically opens the positive and negative 0-10V lines to put the lights at full bright.