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 unit uses a plug in connection. This unit includes a ground.