Signal line and telephone line surge protection

Semiconductor protection and Contact park suppression

Line protection　

Line to Line Protection Connections

Line to Line

Symbol	Line Voltage	Varistor Voltage
V1	DC 12V	22V
	DC 24V	39V
	AC 100V	200V,220V,240V,270V
	AC 120V	240V,270V*
	AC 127V	270V
	AC 200V	390V,430V,470V*
	AC 240V	430V,470V*

V3	AC 240V	430V,470V,510V
	AC 265V	510V
	AC 380V	820V
	AC 415V	910V
	AC 460V	1100V
	AC 480V	1100V

Notes

1.Maximum operating voltage shall be lower than Maximum allowable voltage of Varistor at any time

2.Varistor with * are recommended for single phase, 3 wire applications to withstand a temporary overvoltage caused by unbanlance load.

Line to Line to Ground Protection Connections

Line to Ground

Symbol	Line Voltage	Varistor voltage
V2	AC100V to 220V	430V,470V
V2	AC240V	430V,470V or 750V* * or higher Varistor Voltage or 1800V* * *
V4	AC240V	430V,470V or 750V* * or higher Varistor Voltage or 1800V* * *

Notes

1.When the 500V insulation resistance test of the circuits employing Varistor is conducted, We shall be remove after getting approval from the customer, or * * with the Maximum Allowable Voltage exceeding to test voltage shall be used.

2.When the 1000V withstanding voltage test is conducted, We shall be removed after getting approval from the customer according to the relevant regulations, or * * * with the Maximum allowable exceeding to the test Voltage shall be used.

3.To avoid Varistor failure caused by the ground fault, We with higher Voltage listed in the table shall be used for the AC 120V line to ground application.