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.

Keystone Technologies Core and Coil pulse start metal halide replacement HID ballast kits contain the appropriate core and coil, a properly rated capacitor and all components required for ballast replacement. Keystone Ballast core and coil models are ideal for a wide variety of lighting applications, including factories, warehouses, gymnasiums and retail stores.

This replacement pulse start metal halide ballast covers 4 primary input voltages commonly utilized in the United States. Keystone Ballast MPS-320A-Q-KIT, Quad Tap Metal Halide Ballasts Replacement HID Ballast Kit for 320W Pulse Start Metal Halide, Core And Coil, Circuit Type CWA, Metal Halide Lamp Type, 320 Lamp Watts, M132/H154 ANSI Ballast Type, 355 Input Watts, 120/208/240/277 Input Voltage, 60 Hz. The dimensions on this MH ballast are 4.25" Long x 1.82" Wide x 4.75" High. This Keystone Ballast carries a 2 year warranty.