Finder 3931 masterplus electromechanical relay interface modules finder 393100120060 this is the finder 393100120060 relay interface module from the masterplus range these are versatile electromechanical relay modules which can be used for either inputs to or outputs from plcs and other controllers they benefit from exta protection due to a user changeable micro fuse 5 x 20mm which is visible through a window finder 393100120060 masterplus emech relay interface module 250v 6