Power Quality

Standard and Regulation

Standard IEC 61643-1 (Surge Protecting)

Protector Parameter


• Level of Protection (Up)

Maximum residual voltage between the terminals of the protection device during the application of the peak current.


• Nominal Current (In)

Peak current in 8/20 µs waveform the protection device can withstand 20 times without reaching end of life.


• Maximum Discharge Current (Imax)

Peak current with 8/20 µs waveform in single pulse which the protection device can withstand without reaching end of life. This parameter is used in Class II SPD


• Maximum Continuous Operating Voltage (Uc)

Maximum effective voltage (r.m.s or dc) that can be applied permanently to the terminals of the protection device


• Impulse Current (Iimp)

Peak current with 10/350 µs waveform which the protection device can withstand without reaching end of life. This parameter is used in Class I SPD

Classification of protectors

• Class I

Tested with a 10/350 µs waveform, simulates the current produced by a direct lightning strike.

High Protection Level (Up). Class I protector are required where a direct impact of lightning are expected or there is a lightning protection system. These protectors must be installed at the main incomer due its high discharge capacity and the main incomer expects the highest exposure to overvoltage. Must be accompanied by downstream Class II protector.


• Class II

Tested with a 8/20 µs waveform, simulates the current produced in the event of a switching or lightning strike on the distribution line or its vicinity.

Medium Protection Level (Up). Class II protector is required in the downstream of Class I SPD at the main incomer where there is not external protection or the distance from installation with an external protection is less than 50 m, or in areas with low exposure to lightning strikes.


• Class III

Tested with a combined 1.2/50 µs - 8/20 µs waveform, simulates the current and voltage that can reach the equipment to be protected.

Low Protection Level (Up). Must be installed to protect sensitive equipment for individuals and industrial equipments, and on equipments over 20 m away from where the Class II SPD is installed.


* The technology can provide protection solutions that combine different types of protection: Class I+II and Class II+III.


• Description:

“Power frequency overvoltage protective devices for household and similar applications (POP)” published on March 16, 2011, is the first standard for power frequency overvoltage protection.

• Objective:

To mitigate the effects of power frequency over voltages between phase and neutral conductor caused by breakage of neutral.

• Scope of the standard:

Power frequency overvoltage protectors (POP) for household and similar applications.

Salient Point

• Progressive Voltage/Time tripping curve.

The tripping time depends on the magnitude of the overvoltage, ensuring quick tripping in the case of severe disturbances while avoiding unwanted activation in the event of small voltage increases.

• Common Manufacturer

Common manufacturer of the power frequency overvoltage protector and the MCB.

• Prohibition on using earth leakage or current differential as operating principles.

Transient Overvoltage Protection


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