Siemens Low Voltage Busway XLU Busway Plugs - XLU BW CB PL 3PH4W 100pct Ntrl 125 Amp are Power Distribution Busway. Sub Brand XLU BW Plugs Circuit Breaker TypeXL-U Special Features Enclosure for ED Frame Application Busway Standard UL Number Of Wires 4W Phase 3PH NEMA Rating IP40 Consist Of Enclosure Only