I-Line Busway offers a complete line of compatible, sandwich-type feeder and plug-in busway lengths, fittings, and plug-in units. I-Line plug-in busway has options to 1600A for circuit breaker plug-ins and 1200A for fusible plug-ins. Circuit breaker and fusible plug in units are available in 3 phase, 3 wire or 3 phase, 4 wire configurations. This fusible plug-in unit is 400A, 600VAC max, 3 pole, and 3 fuse + G. This unit uses a plug in connection. This plug-in unit accepts H, K, J or R fuses. I-Line Busway plug in units are UL listed and CSA certified. I-Line busway is UL listed and CSA certified.