Master Controller is housed in enclosure and provided with an easily removable cover with ample area for maintenance. The cam shaft is mounted on bearing bushes on walls of housing. The Cam are made of thermoplast material and fixed on square spindle switch which is moved by a handle. The cams are cut to correspond to the switching program Aluminum die cast Powder Coated Suitable for Hoist-Grab, Mill duty, E. O. T. Cranes and Rolling mill drives.