C.A.P. MLC-4T and MLC-4aT light controls 

The C.A.P. MLC-4T and MLC-4aT master lighting controllers allow you to control up to FOUR 1000 watt HID lights from one time-clock or controller. Run 30 amp, 240 volt power into the MLC-4, and all of the outlets are controlled by the integrated time clock. The MLC-4T and MLC-4aT come with a 120 volt “Trigger” cable, and a built in 24-hour Timer. The Trigger Cable can be connected to an HLC-1, 2 or 3 in order to protect your growing area from overheating and your lights from “Hot Starts,” increasing the life of your lighting system and bulb. 

The MLC-4 features four standard 240 volt style (NEMA 6-15) outlets, which your ballasts are plugged into. The MLC-4aT uses 120 volt style (NEMA 5-15) outlets which allows for running your ballasts at 240 volts without having to change out your ballast power cords.

These light controllers need to be hardwired. We recommend a licensed electrician install this unit.

Specifications:

Trigger Voltage: 120 volts
Receptacle Type: MLC-4T: Nema 6-15 /// MLC-4aT: Nema 5-15
Main Power Voltage: 240 volts
Maximum Relay Amperage: 30 amps
Maximum Wattage: 4000 watts/1000 watts per receptacle
Operating Temperature Range: 32-120° F
Operating Humidity Range: 0-99% RH
Relay Operations (minimum): 100,000 Electrical

Warranted against defects in workmanship and parts for THREE Years!

More info from the Manufacturer (PDF format - Lots of detail.)