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Homepage>BS Standards>33 TELECOMMUNICATIONS. AUDIO AND VIDEO ENGINEERING>33.040 Telecommunication systems>33.040.99 Other equipment for telephone and telegraph communications telecommunication systems>BS EN 61643-351:2017 Components for low-voltage surge protective devices Performance requirements and test methods for telecommunications and signalling network surge isolation transformers (SIT)
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immediate downloadReleased: 2017-02-28
BS EN 61643-351:2017 Components for low-voltage surge protective devices Performance requirements and test methods for telecommunications and signalling network surge isolation transformers (SIT)

BS EN 61643-351:2017

Components for low-voltage surge protective devices Performance requirements and test methods for telecommunications and signalling network surge isolation transformers (SIT)

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Standard number:BS EN 61643-351:2017
Pages:32
Released:2017-02-28
ISBN:978 0 580 85903 8
Status:Standard
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BS EN 61643-351:2017


This standard BS EN 61643-351:2017 Components for low-voltage surge protective devices is classified in these ICS categories:
  • 33.040.99 Other equipment for telecommunication systems
IEC 61643-351:2016 defines test circuits and test methods for determining and verifying the SIT surge parameters. Preferred performance values for key parameters are given. Surge isolation transformers (SITs) are used for signal transformer applications with signal levels up to 400 V peak to peak. SITs are transformers, with or without an internal-winding screen, with a rated impulse withstand voltage greater than the peak voltage of the expected common-mode surge environment. SITs are applicable to components for surge protection against indirect and direct effects of lightning or other transient overvoltage. SITs are used to mitigate the onward propagation of common-mode voltage surges. This part of IEC 61643 does not cover SIT operation under differential-mode lightning surge conditions. Keywords: Surge isolation transformers (SITs)
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