The terminal block wire guard type

In this design, PTR screw terminal blocks make use of stainless steel wire protection which protects the connected wire. The solder pin and clamp body form a single unit, and this guarantees low transition resistance and minimal voltage loss. This configuration allows for (a) a versatile and low-cost solution for terminal blocks whose terminal clamps are rarely removed; and (b) the use of both solid and stranded conductors with and without ferrules. Applications include building automation, safety technology, and telecommunication.