Plug-in interface relay with a width of 13 mm for installation in the plug-in base using robust flat pins. Two relay changeover switches can each be loaded up to 5 A. The relay has a transparent cover through which you can see the switching state of the contacts. There is therefore NO mechanical display or LED. In addition, there are NO test buttons or test levers for the operator to operate, so that the contact change can only be carried out via the control.