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Surge Arresters & Insulators
Jointing Tech supplies surge arresters, insulators and related accessories for medium- and high-voltage electrical systems. Our range includes class 1 metal oxide, class 2 open-cage polymeric and class 3 station-class surge arresters, together with surge counters and associated products.
Surge-protection equipment is used to help protect electrical systems and connected equipment from transient over voltages caused by events such as lightning activity or switching operations. Correct selection is essential and must be based on the system design, voltage class, insulation coordination, equipment location and applicable standards.
A surge arrester does not simply absorb an electrical surge. In a correctly designed system, it provides a controlled path for surge energy and helps limit the voltage appearing across protected equipment. This assists with protecting insulation systems, switchgear, transformers, cable systems and other equipment from damaging transient over voltages.
Selection should be carried out as part of the overall electrical design. Confirm the system nominal voltage, maximum continuous operating voltage, earthing arrangement, insulation level, expected duty, location, pollution conditions, altitude where relevant and the equipment being protected. The arrester’s protective characteristics and energy capability must be appropriate for the application.
Surge arresters are often used alongside a suitable earthing system. The quality and design of the earth connection can affect protective performance, so consider the arrester and earthing arrangement together rather than as separate products.
Competent personnel should carry out installation in accordance with the manufacturer's instructions and project requirements. For a replacement product, provide the existing arrester's reference, system details, photographs and equipment information.
FAQs
What is a surge arrester?
It is a protective device used in electrical systems to help limit transient overvoltages caused by lightning or switching events.
What is the difference between an arrester and an insulator?
An arrester is intended to manage surge overvoltages. An insulator is used to provide electrical isolation and mechanical support in suitable systems.
How do I choose a surge arrester?
Selection requires the system voltage, earthing arrangement, equipment type, duty, location and project requirements.
Why are surge counters used?
They can be used with suitable arrester arrangements to provide an indication of arrester operation or surge activity.
Need help selecting surge protection?
Contact Jointing Tech with the system voltage, equipment details and specification for support.
