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What is the difference between 10/350μs and 8/20μs waveform?

[2021-08-11 14:04:50]

According to IEC61643-11, Type 1 surge protective device should be tested by 10/350μs waveform and Type 2 SPD should be tested by 8/20μs waveform. 10/350μs waveform is a surge which reaches peak value at 10μs and it reduces to half of peak current at 350μs. Take BR-25GR type 1 SPD as an example, the ... Read More

What is difference between type 1, type 2 and type 3 surge protective devices?

[2021-08-11 13:52:39]

Type 1 Type 1 Surge Protective Device (SPD)s are intended for installation between the secondary of the service transformer and the line side of the service equipment overcurrent device, as well as the load side, including watt-hour meter socket enclosures, and are intended to be installed without ... Read More

Understanding Surge Protective Device Ratings

[2021-08-11 13:48:19]

How to know what kA rating to use Selecting the appropriate surge protective device (SPD) can seem like a daunting task, especially with all of the different types on the market today. The surge rating or kA rating of an SPD is one of the most misunderstood ratings. Customers commonly ask for an SPD ... Read More

Rating of Backup Breaker for Surge Protective Device

[2021-08-11 13:44:49]

By Andy Xuyang Xu Quite often, customer will ask, which rating of MCB or RCDs to be chosen to protect the surge protective devices (SPD)? The answer is simple: we do not know. The fact is that different MCB has different tripping force, different designed tripping mechanism has different moving ... Read More

Standards Related to Surge Protection Devices

[2021-08-06 14:50:38]

IEC/EN 61643-11:2011 Low-voltage surge protective devices–Part11: Surge protective devices connected to low-voltage power systems–Requirements and test methods IEC 61643-11:2011 is applicable to devices for surge protection against indirect and direct effects of lightning or other transient ... Read More

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