Purpose and Range of Appliance
　　 Model YH5WS1 power distribution organic compound coated metal-oxide surge arrester without gaps is used to protect high voltage equipments such as distribution transformer, cable head, etc from damage of over voltage. The following is its operation condition:
　　 1.1 Ambient temperature of -40℃~+40℃.
　　 1.2 Altitude is below 1,000 meters above sea level.
　　 1.3 Rated frequency of 48Hz ~ 62Hz.
　　 1.4 Maximum win speed on the installation site is no more than 35m/s.
　　 1.5 Maximum horizontal pull of the wire on the top of arrester is no more than 147N.
1.6 Continuous power frequency voltage on the arrester is no more than the continuous running voltage.

Meanings of the Model
Y H 5 W S 1 --17 /50
residual voltage under nominal discharge current（kV）
Rated voltage of the arrester
Project number
Site number (W: power distribution model)
Zero clearance
Rated discharge current (kA)
Organic compound coat
Metal-oxide surge arrester without gaps