Siemens Low Voltage Busway BD Busway Plugs - BD Bway Fusible Plugs 3PH3W 30 Ampare Power Distribution Busway. Sub Brand BD BW Plugs Fusible Type BD Plug-In Special Features Floor-Operable Application Busway Standard UL Number Of Wires 3W Phase 3PH NEMA Rating IP40 Consist Of ITE Fusable Switch Plugs with Line Terminal Protection