High-voltage column insulators are used for insulation and support wires in high-voltage overhead transmission and distribution lines. They are generally divided into five levels of 6, 10, 15, 20 and 35KV according to the approved voltage. The column insulator is made of porcelain and steel feet with no less than 525 Portland cement and porcelain sand glue.

The surface of the porcelain is white or brown, and the surface of the steel is hot-dip galvanized. Column insulators are in accordance with International GB1000 "High Voltage Line Pin Insulators" and GB772 《Technical Conditions for High Voltage Pin Insulators》

Type	Rated voltage KV	Lightning impulse withstand voltage (KV)	Power frequency voltage (KV)	Creepage distance (mm)	Bending damage load (KN)	Weight (kg)
PS-15/3	15	105	40	300	3	2
PS-15/5	15	105	40	360	3	5
PS-20/12.5	20	110	45	400	12.5	7