The operating handle of plug can be installedon the top or side with accurate opening or closing indication. The padlock mechanismis set for protecting the plug from mal-operation and any unauthorized access. Busbar plug-in box outlet coversprevent unintentional contact of the busbar. Plug in units areautomatically grounded on installation. Polarized engagement of the plug to thebusway provides the installer withpositive plug/phasealignment. Busbar plug-in box areprovided with internal interlocking mechanisms to prevent their doors frombeing opened whilst energized, ensuring operation safety.