PS4 Busbar Plug-In Connectors Hirose Electric PS4 Busbar Plug-In Connectors provide a plug-in connection to improve efficiency and safety of assembly, maintenance, and unit expansion works. These modules feature a floating structure that absorbs mounting misalignment ±2mm in the XY direction. Hirose Electric PS4 Busbar Plug-In Connectors offer high current support of 150A or 300A, depending on busbar thickness. The compact design is applicable to 1U sizes. Applications include data centers, power distribution units, storage battery systems, and uninterrupted power supplies (UPS).