The SY4S-51F1 is a 14-blade panel mount socket with solder terminals designed for industrial relay and timer applications. It features an electrical rating of 300V at 7A and is compatible with multiple relay types including RY4S, RY42S, RM2S, RY2KS, RU4S, RU2S, RU42S, and the GT5Y timer. The socket is constructed for collective panel mounting with integrated mounting springs that clip onto panel edges, and includes a hold-down spring (SY4S-51F1 for most relays, with SY4S-02F3 available for RY2KS relay). It accommodates panel thicknesses of 1 to 2 mm and features a width of 1.063 inches. The socket is widely used in control panels, automation systems, and industrial equipment where reliable relay switching and modular socket mounting are required.