In-line feed powers track system in between track units in a straight 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: 4A Maximum Wattage: 480W Dimming: Triac or ELV Finish: White