12V Transformer Magnetic Encased In Metal UL,C-UL & CSA Listed Magnetic transformers are encased in a metal, black powder coated enclosure and potted to minimize noise and vibration. All are UL, C-UL and CSA listed, thermally protected, dimmable and have resettable circuit breakers that protect against short circuits. Easy hang bracket. Wiring access door and knockouts for conduit. One standard tap and one boost tap to compensate for voltage drop in remote applications.