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Surge Protection

Surge Protection

Introduction to Surge Protection

Lightning / Surge protection for electrical and electronic systems to the new British and European standard BS EN 62305-4.

Kingsmill Industries (UK) Ltd can offer a complete solution to protect vital electrical and electronic systems from damage. Recently introduced standards put equal importance to protecting the electrical installation and electrical equipment as to the building itself.

Modern micro electronic components are very sensitive to overvoltages and because many systems are networked, they rely on each other for the system to operate. If one part of the system gets damaged due to lightning or surges the whole system will not operate. The consequential losses suffered during such events ie downtime and lost production can be very high.

Kingsmill Industries (UK) Ltd can offer a wealth of experience in helping you decide which product best suits your needs together with our manufacturer who has many years experience in the industry. You can speak to a product specialist who will quickly answer any questions you may have and recommend the correct product for your application. Our catalogue contains the most commonly used products. We have, however, over 4000 devices and components, a product for every application.

New Standard BSEN62305-4 1st Sept 2008 & 17th Edition Wiring Regs Amendments 1st Jan 2012.
This new standard replaced BS6651 on the above date, it is now mandatory to fit a lightning current arrester on main incoming panels which are situated in buildings with external lightning conductors or fed by an overhead line. This type of arrester are designated as a Type1, we recommend a combined T1 + T2 + T3 arrester as this gives additional surge protection for no added cost. The minimum discharge capability for a T1 arrester has to be 50Ka 10/350μs level 3 or 4.

For a Level 1 installation the minimum requirement is 100Ka 10/350μs.

Panels feeding external circuits such as car park lighting, cctv etc should also have a combined T1+T2+T3 arrester fitted as standard.

For panels in buildings without external lightning conductors and fed by underground cables a T2 surge arrester is sufficient. Sub-distribution boards or local control panels more than 10 metres from the main incomer and not feeding external circuits then a Type 2 surge arrester can be used.

Final sub-circuits and sensitive electronic equipment for example fire/burglar panels, PLCs which are fitted more than 10 metres from the last surge arrester should have a T3 surge arrester fitted at the panel or equipment to be protected.

For further information including surge protection design and recommendations please contact our sales office.

The Kingsmill range of mains power co-ordinated Surge Protection Devices (SPD) aims to keep product selection simple

The range comprises:

  • Combined Type 1 and Type 2 lightning current arrestor (for use at the boundary of zones LPZ0 and LPZ1 or higher)
    Usually fitted to the main distribution board on the entry point
  • Type 2 surge arrestor (for use at the boundary of zones LPZ1 and LPZ2 or higher)
    Usually fitted to the secondary distribution board(s)
  • Type 3 surge arrestor (for use at the boundary of zones LPZ1 or higher)
    Usually fitted adjacent to the terminal equipment requiring protection

The heavy duty combined Type 1 and Type 2 arrester offers the benefits of special technology combining multi-MOV (metal oxide varistor) and GDT (spark gap) in serial connection giving prolonged lifetime without leakage current and without follow current.

Our range of mains devices is fully coordinated to allow ease of installation without the need to consider minimum cable inductance requirements between devices.

The Kingsmill range of surge protection devices fully complies with the requirements of BS:EN 62305 (for lightning protection) and EN 61643-11 (for surge protection devices).

All of the Kingsmill mains Surge Protection Devices have plug-able modules and we offer remote status signalling as standard.

Versions are available to suit TNS, TNC and TT applications see Surge Protection Device (SPD) selection guide.

Surge Protection Devices – product selector

Combined type 1 & 2 device – lightning current and surge arrestors

Part number
Earthing system
Number of poles
Phase
KM1+2-25-2+0 SC
TNS
2 pole
single phase
KM1+2-25-4+0 SC
TNS
4 pole
three phase
KM1+2-25-3+0 SC
TNC
3 pole
three phase
KM1+2-25-1+1 SC
TT
2 pole
single phase
KM1+2-25-3+1 SC
TT
4 pole
three phase

Type 2 device – surge arrestors

Part number
Earthing system
Number of poles
Phase
KM2-20-2+0 SC
TNS
2 pole
single phase
KM2-20-4+0 SC
TNS
4 pole
three phase
KM2-20-3+0 SC
TNC
3 pole
three phase
KM2-20-1+1 SC
TT
2 pole
single phase
KM2-20-3+1 SC
TT
4 pole
three phase
KM2-20-1+0 SC
single pole
1 pole
single phase
KM2-20
spare module L-N (L-PE)
module
KM2-NPE
spare module for NPE type 2
module

Type 3 device – surge arrestors

Part number
Earthing system
Number of poles
Phase
KM3-10-1+1 SC
TT/TNS
2 pole
single phase
KM3-10-3+1 SC
TT/TNS
4 pole
three phase
KM3-10
spare module L-N
module
KM3-NPE
spare module for NPE
module

Main Incoming Position

CLASS I

Protection against direct lightning currents (lightning current arrester)

(10/350 μs)

Sub Dist. Board Position

CLASS II

Protection against indirect lightning effects (surge arrester)

(8/20 μs)

Socket Outlet or Final Sub Circuit

CLASS III

Protection against switching overvoltages (surge arrester)

(8/20 μs)

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