Feature List Body Construction Durable injection-molded Plastic Polycarbonate wire cover. Galvanized steel mounting plate, includes center knockout that enables feeding from junction box for simple wiring termination. Four additional 7/8" offset knockouts are also provided for direct electrical feed connections and to accommodate grid ceiling runners. Tamper-proof steel mounting screws secure wire cover to plate.Current Limiting Circuit Breakers Single pole current limiters limit the current that can be consumed on the track section being fed. Easily resettable in the event of an over-current situation. Illuminated rocker switch is easily seen from floor level to confirm that power is being supplied to track circuit. Can be used as a standard ON/OFF switch.Electrical Rated for 120V AC / 60Hz operation. All wiring should meet national and local electrical codes. Use 12 gauge, 90°C minimum power supply wire. Two ground terminals for supply ground wire provided on mounting plate.Load Limitation Leave at least 25% of circuit capacity open to accommodate "InRush Current" for LED fixtures. Specific system properties may require more capacity.Compatibility Compatible with A-Line's single circuit track only (ATK series).Mounting Oval mounting holes on 3½" centers provided for direct mounting on to a junction box or mounting surface.Approvals cULus listed.