Live end feed powers the track system from the end of a run. Junction box canopy mounts over a 4" or 3" octagon outlet box and includes two knockouts. Current limiter can be used as on/off switch. Compatible Track System: One-Circuit Polarity: Right Polarity Input Voltage: 120V Breaker: 12A Maximum Wattage: 1440W Dimming: Triac or ELV Finish: Silver