KTSB-E-2048-46-UV-S 120-277 Volt Electronic Sign BallastKeystone's line of sign ballasts makes sign maintenance simple. With only a handful of electronic ballasts that cover virtually all common plastic sign configurations, you're sure to have the right ballast for the job. With Keystone's quality and dependability, you can count on your installation to last, maintenance free for years to come. The Keystone KTSB E 2048 46 UV S is UL, CUL 935 Listed and will operate 4 6 lamps with a total lamp footage of 20