A pin insulator consists of a non-conducting material such as porcelain, glass, plastic, polymer, or wood that is formed into a shape that will isolate a wire from a physical support (or "pin") on a telegraph, utility pole or other structure, providing a means to hold the insulator to the pin and secure the conductor to the insulator. Unlike a strain insulator, the pin insulator is directly connected to the supporting pole.
Pin insulators were utilized before 1830, pre-dating the strain insulator. Production of pin insulators is continued today by manufacturers worldwide.
The pin insulator is designed to allow the conductor to be readily secured to avoid it coming adrift. The most common method is to use a wire to tie the conductor to the insulator. Another method is to provide self-fixing features such as complex slots and grooves formed into the insulator. For heavy conductors, gravity can be used to help hold the conductor in place.
Pin insulators are almost always deployed in the open air, so isolation when wet is a major consideration. To combat this problem they have smooth surfaces and deep skirts or wide shells. These help shed water and increase the surface distance between the conductor and the pin.
The "pin" is typically a wooden or metal dowel of about 3 cm diameter with screw threads. The pin insulator has threads so that it can be screwed onto the pin. A typical pin insulator is more than 10 cm in diameter and weighs one kg or more. Size depends on the voltage to be isolated and the weight of span of wire to be supported.
◆10KV composite stay insulator
◆Porcelain Pin Type Insulator
◆Composite Line Post Insulator,Silicone Rubber Line Post Insulator, Polymer Line Post Insulator