The 50A slip ring collectors are sets of rings couplet with brushes designed to allow current to pass from a fixed to a rotating part. The 50A series is used to supply crane motors, cable winders etc. These units are suitable only for transmitting currents with 50/60Hz supply frequency. The 50A slip ring collectors have 50A line rings and they are supplied either with or without protection.
The shock-resistant thermoplastic protection is used to prevent accidental contacts with live parts; the protection has small downward holes to allow air circulation and prevent moisture. The lower support plate is also provided with three holes to drain the moisture which may form inside the unit.