High Intensity Discharge (HID) lamps require a ballast to apply starting voltage to the lamp and establish current flow an arc between the lamp electrodes. Without a ballast, the arc will extinguish or draw increasing current until some circuit element burns up. Ballasts provide system stability by limiting the current that can be drawn.

Core and Coil metal halide HID ballasts are used in over 90% of all HID lighting. Replacement ballast kits contain the appropriate core and coil, a properly rated capacitor and all components required for ballast replacement. The Keystone Ballast, core and coil, HID ballast kit is ideal for a wide variety of lighting applications, including factories, warehouses, gymnasiums and retail stores.

Keystone Ballast MH-250A-Q-KIT, 250 watt ballast transformer, Quad Tap (or Multi Tap), replacement metal halide ballasts for 250W Metal Halide, Core And Coil, Circuit Type CWA, Metal Halide Lamp Type, 250 Lamp Watts, M58/H37 ANSI Ballast Type, 285 Input Watts, 120/208/240/277 Input Voltage, 60 Hz. The dimensions on this MH ballast are 4.30" Long x 1.65" Wide x 4.80" High. This Keystone Ballast carries a 2 year warranty.

Note: These MH-250A-Q-KIT lighting ballast are also valid replacement HID kits for 250 watt mercury vapor light fixtures. Also rated as an ANSI code H37 ballast, this UL listed ballast serves multiple applications. 

Specification Sheet