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SPD Surge Protection Devices

Showing 41–60 of 109 results

WCED Consumer Units

WCED Cable Pack Kit – Standard Live, Neutral & Earth Cable

8 In stock
More available within 1-3 working days*
SKU: Cable Kit1
£2.00

3-£1.90£0.10£2.00
5-£1.85£0.15£2.00
10-£1.80£0.20£2.00
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Hager JK102SPD Hager JK102SPD 125A Surge Protection Kit Type 2 1

Hager JK102SPD 125A Surge Protection Kit Type 2

2 In stock
More available within 1-3 working days*
SKU: JK102SPD
£247.21
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Surge Devices 10811/LEDENCM Surge Devices 10811/LEDENCM 3 Phase SPD Type 1+2+3 100kA with Full Mode Protection & LED Indication in IP65 Polycarbonate Enclosure

Surge Devices 10811/LEDENCM 3 Phase SPD Type 1+2+3 100kA with Full Mode Protection & LED Indication in IP65 Polycarbonate Enclosure

Delivery usually within 1-3 working days*
SKU: 10811/LEDENCM
£642.06
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Surge Devices 800914ENC Surge Devices Type 1+2+3 100kA 3 Phase SPD with Window Indication and Pluggable Modules in IP65 Polycarbonate Enclosure

Surge Devices Type 1+2+3 100kA 3 Phase SPD with Window Indication and Pluggable Modules in IP65 Polycarbonate Enclosure

Delivery usually within 1-3 working days*
SKU: 800914ENC
£553.50
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Surge Devices 10020/2ENCM Surge Protection Devices 10020/2/ENCM

Surge Protection Devices 10020/2/ENCM

Delivery usually within 1-3 working days*
SKU: 10020/2ENCM
£217.71
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Surge Devices SY12350KA4P/ENC Surge Devices Type 1+2+3 50kA 3 Phase Lightning and Surge Arrester with Window Indication in IP65 Polycarbonate Enclosure

Surge Devices Type 1+2+3 50kA 3 Phase Lightning and Surge Arrester with Window Indication in IP65 Polycarbonate Enclosure

Delivery usually within 1-3 working days*
SKU: SY12350KA4P/ENC
£394.83
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Surge Devices SY12325KA2P/ENCM Surge Devices Type 1+2+3 25kA Single Phase Lightning and Surge Arrester

Surge Devices Type 1+2+3 25kA Single Phase Lightning and Surge Arrester

Delivery usually within 1-3 working days*
SKU: SY12325KA2P/ENCM
£217.71
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Surge Devices SY2-C40XENC Surge Devices Type 2 20kA/40kA 3 Phase SPD with Window Indication in IP65 Polycarbonate Enclosure

Surge Devices Type 2 20kA/40kA 3 Phase SPD with Window Indication in IP65 Polycarbonate Enclosure

Delivery usually within 1-3 working days*
SKU: SY2-C40XENC
£195.57
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Surge Devices SY2-C40XENCM Surge Devices Type 2 20kA/40kA 3 Phase SPD with Window Indication & 3P 32A MCB in IP65 Polycarbonate Enclosure

Surge Devices Type 2 20kA/40kA 3 Phase SPD with Window Indication & 3P 32A MCB in IP65 Polycarbonate Enclosure

Delivery usually within 1-3 working days*
SKU: SY2-C40XENCM
£217.71
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Surge Devices 320002/ENC Surge Devices Type 2 Single Module 2P SPD with Replaceable Modules

Surge Devices Type 2 Single Module 2P SPD with Replaceable Modules, Window Indication and Remote Contacts in A 2 Module Box

Delivery usually within 1-3 working days*
SKU: 320002/ENC
£56.83
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Hager JK101SPD Hager JK101SPD 125A Surge Protection Kit Type 1 & 2 1Hager JK101SPD 125A Surge Protection Kit Type 1 & 2 Three Phase

Hager JK101SPD 125A Surge Protection Kit Type 1 & 2

Delivery usually within 1-3 working days*
SKU: JK101SPD
£384.56
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Surge Devices 10811/LED Surge Devices 3 Phase SPD Type 1+2+3 100kA with Full Mode Protection & LED Indication

Surge Devices 3 Phase SPD Type 1+2+3 100kA with Full Mode Protection & LED Indication

Delivery usually within 1-3 working days*
SKU: 10811/LED
£590.40
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Surge Devices 10812/LED Surge Devices Type 1+2+3 50kA Single Phase SPD with All/Full Mode Protection & LED Indication

Surge Devices Type 1+2+3 50kA Single Phase SPD with All/Full Mode Protection & LED Indication

Delivery usually within 1-3 working days*
SKU: 10812/LED
£369.00
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Surge Devices 800914 Surge Devices 800914 Type 1+2+3 100kA 3 Phase SPD with Window Indication and Pluggable Modules

Surge Devices 800914 Type 1+2+3 100kA 3 Phase SPD

Delivery usually within 1-3 working days*
SKU: 800914
£523.98
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Surge Devices 800912 Surge Devices Type 1+2+3 50kA Single Phase SPD with Window Indication and Pluggable Modules

Surge Devices Type 1+2+3 50kA Single Phase SPD with Window Indication and Pluggable Modules

Delivery usually within 1-3 working days*
SKU: 800912
£265.68
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Surge Devices 10020/4 Surge Devices Type 1+2+3 50kA 3 Phase Lightning and Surge Arrester with Indication

Surge Devices Type 1+2+3 50kA 3 Phase Lightning and Surge Arrester with Indication

Delivery usually within 1-3 working days*
SKU: 10020/4
£369.00
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Surge Devices 10020/2 Surge Devices Type 1+2+3 25kA Single Phase Lightning and Surge Arrester with Indication

Surge Devices Type 1+2+3 25kA Single Phase Lightning and Surge Arrester with Indication

Delivery usually within 1-3 working days*
SKU: 10020/2
£184.50
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Surge Devices 381649S Surge Devices Type 1+2+3 50kA 3 Phase Lightning and Surge Arrester with Window Indication and Pluggable Modules

Surge Devices 381649S Type 1+2+3 50kA 3 Phase Lightning and Surge Arrester

Delivery usually within 1-3 working days*
SKU: 381649S
£428.04
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Surge Devices 10811/LEDENC Surge Devices 10811/LEDENC 3 Phase SPD Type 1+2+3 100kA with Full Mode Protection & LED Indication

Surge Devices 10811/LEDENC 3 Phase SPD Type 1+2+3 100kA with Full Mode Protection & LED Indication

Delivery usually within 1-3 working days*
SKU: 10811/LEDENC
£619.92
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Surge Devices 10812/LEDENC Surge Devices Type 1+2+3 50kA Single Phase SPD with All/Full Mode Protection & LED Indication in IP65 Polycarbonate Enclosure

Surge Devices Type 1+2+3 50kA Single Phase SPD with All/Full Mode Protection & LED Indication in IP65 Polycarbonate Enclosure

Delivery usually within 1-3 working days*
SKU: 10812/LEDENC
£394.83
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More products

Showing 41–60 of 109 results

Surge Protection Devices (SPDs) – Essential Protection for Electrical Systems

A Surge Protection Device (SPD) protects electrical systems from transient overvoltages, commonly known as power surges. These voltage spikes originate from lightning strikes, power grid switching, or internal electrical disturbances. Without protection, surges can damage sensitive equipment, disrupt operations, and lead to costly repairs.

To prevent these issues, SPDs detect excessive voltage and divert it safely to the earthing system, ensuring electrical systems remain stable. BS 7671, the UK wiring regulations, outlines conditions where SPDs may be necessary. Since specific requirements depend on factors like system design and risk assessments, consulting a qualified electrical professional is always recommended.

Types of Surge Protection Devices (SPDs)

SPDs fall into three main categories, each providing different levels of protection:

Type 1 SPD – Main Incoming Protection
  • Installed at the origin of the electrical installation, usually in industrial, commercial, and high-risk environments.
  • Handles direct lightning strikes by discharging high-energy surges safely to earth.
  • Protects buildings with lightning protection systems (LPS) or external surge arresters.
  • BS 7671 recognises Type 1 SPDs for installations that require protection against direct lightning strikes.
  • Common applications: Large commercial buildings, industrial sites, and locations with high lightning exposure.
Type 2 SPD – Secondary Protection for Distribution Boards
  • Positioned at the distribution board to safeguard downstream circuits from switching surges and transient overvoltages.
  • Protects equipment like computers, HVAC systems, and automation controls in commercial, industrial, and residential properties.
  • Limits internally generated surges caused by motors, fluorescent lighting, and circuit breakers.
  • BS 7671 specifies conditions where Type 2 SPDs should be installed, particularly when overvoltages pose risks such as loss of life, public service disruption, or financial loss.
  • Common applications: Office buildings, homes, factories, and retail premises.
Type 3 SPD – Localised Device Protection
  • Installed at the equipment level to provide fine protection for sensitive electronics such as computers, medical equipment, and entertainment systems.
  • Works alongside a Type 2 SPD since it cannot handle large surge currents on its own.
  • Available as plug-in adaptors or DIN rail-mounted solutions, making them ideal for specific appliances.
  • Common applications: Workstations, televisions, routers, and other high-value electronics.
SPDs and BS 7671 Compliance

The UK wiring regulations, BS 7671 (IET Wiring Regulations), outline guidelines for installing SPDs. These regulations assess several factors, including:

  • Exposure to external surge risks, such as lightning strikes.
  • Installation type, focusing on safety-critical applications.
  • Potential damage caused by transient overvoltages, including financial loss and equipment failure.

Although BS 7671 provides essential criteria, a qualified electrician should always evaluate an installation to confirm the appropriate SPD setup.

Which Electrical Systems Require SPDs?

SPDs play a crucial role in protecting electrical systems across various settings, including:

  • Commercial Buildings – Shields office computers, servers, and security systems from power surges.
  • Industrial Sites – Prevents damage to motor-driven equipment, control panels, and production machinery.
  • Residential Properties – Preserves smart home devices, electrical appliances, and heating systems.
  • Data Centres – Ensures continuous operation of servers and networking infrastructure.
  • Healthcare Facilities – Protects medical equipment and emergency systems from electrical disruptions.
  • Renewable Energy Installations – Prevents surge-related failures in solar inverters and wind turbine controllers.
Why Install a Surge Protection Device?
  • Prevents Equipment Damage – Stops power surges from degrading electrical components.
  • Reduces Downtime – Minimises costly repairs and operational disruptions.
  • Ensures BS 7671 Compliance – Meets regulatory requirements in installations where surge protection is necessary.
  • Improves Fire Safety – Lowers the risk of fires caused by overvoltage stress on electrical wiring.

Selecting the Right SPD for Your Installation

Choosing the right SPD depends on system voltage, exposure level, and equipment sensitivity. When selecting an SPD, consider:

  • Nominal Voltage (Uₙ) – Matching the SPD to the system’s operating voltage.
  • Maximum Discharge Current (Imax) – Determining the surge-handling capacity required.
  • Installation Location – Identifying whether protection is needed at the main panel, distribution board, or directly at the equipment level.

For comprehensive protection, combining Type 1, Type 2, and Type 3 SPDs creates a layered defence against surges. Since regulations and requirements vary, a qualified professional should assess each installation to ensure compliance with BS 7671 and site-specific needs.

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