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Circuit Protection

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SPD Surge Protection Devices

SPD Surge Protection Devices (109)

Live Electrical RI20DC Live Electrical 4 Pole 20A DC Rotary Isolator Switch 1Live Electrical RI20DC Live Electrical 4 Pole 20A DC Rotary Isolator Switch 2

Live Electrical RI20DC 4 Pole 20A DC Rotary Isolator Switch

7 In stock
More available within 1-3 working days*
SKU: RI20DC
£20.99 £16.10
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Axiom SF20 Axiom SF20 20A TPN Switch Fuse with Fuses

Axiom SF20 20A TPN Switch Fuse with Fuses

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SKU: SF20
£64.50
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Axiom SF32 Axiom SF32 32A TPN Switch Fuse with Fuses

Axiom SF32 32A TPN Switch Fuse with Fuses

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SKU: SF32
£85.95
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WCED ATDR463-100 Time Delay Type A 4 Pole 63A 100mA RCD

WCED ATDR463-100 Time Delay Type A 4 Pole 63A 100mA RCD

3 In stock
More available within 1-3 working days*
SKU: ATDR463-100
£27.24

2-£25.88£1.36£27.24
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WCED ATDR480-100 Time Delay Type A 4 Pole 80A 100mA RCD

WCED ATDR480-100 Time Delay Type A 4 Pole 80A 100mA RCD

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SKU: ATDR480-100
£34.88

2-£33.14£1.74£34.88
3-£32.26£2.62£34.88
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Axiom SD100 Axiom 100A Isolator TPN Grey Steel Enclosure

Axiom 100A Isolator TPN Grey Steel Enclosure

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SKU: SD100
£165.50
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Axiom RS254SE Axiom Rotary Isolator - 415V 25Amp 4P

Axiom RS254SE 4 Pole 25A Rotary Isolator – 415V

1 In stock
This item cannot be back-ordered
SKU: RS254SE
£20.95
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Axiom THR133.6 Axiom Thermal Overload Relay 2.8 - 4.2A

Profix THR133.6 Thermal Overload Relay 2.8 – 4.2A

1 In stock
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SKU: THR133.6
£12.50
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Hager VML112SPD 12 Way Main Switch Consumer Unit with 100A main switch and Type 2 SPD, featuring rectangular knockouts with a matching grommet/gland. Alternative model VML112SPDRK offers round knockouts but requires a separately purchased gland. Hager VML112SPD 12 Way Main Switch SPD Consumer Unit

Hager VML112SPD 12 Way Main Switch SPD Consumer Unit

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SKU: VML112SPD
£84.95
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Deligo GS1/10M-1 0.4mm-1.0mm Grommet PE Strip - 10 metres 1

0.4mm-1.0mm Grommet PE Strip – 10 metres

3 In stock
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SKU: GS1/10M-1
£5.60
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Europa ECLR01 Europa Latching Relay - 1P C/O 16A 12-240V AC/DC

Europa ECLR01 Latching Relay – 1P C/O 16A 12-240V AC/DC

Out of stock
This item cannot be back-ordered
SKU: ECLR01
£17.35
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Europa ECPF03 Europa Phase Failure Relay - 10A 220-460V AC Phase Loss / Sequence

Europa ECPF03 Phase Failure Relay – 10A 220-460V AC Phase Loss / Sequence

2 In stock
This item cannot be back-ordered
SKU: ECPF03
£15.43
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Europa ECPF05 Europa Phase Failure Relay - 10A 220-460V AC Adjustable Phase Loss / Sequence Under and Over Voltage

Europa ECPF05 Phase Failure Relay – 10A 220-460V AC Adjustable Phase Loss / Sequence Under and Over Voltage

1 In stock
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SKU: ECPF05
£25.62
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Europa GZS92-BLACK Europa 5 Pin Slimline Low Profile Relay - 1P CO 12A 300V AC

Europa GZS92-BLACK 5 Pin Slimline Low Profile Relay – 1P CO 12A 300V AC

1 In stock
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SKU: GZS92-BLACK
£3.55
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WCED WAC4P25NC/24 WCED 4 Pole 25A 24V Normally Closed AC Contactor 1

WCED 4 Pole 25A 24V NC Normally Closed AC Modular Contactor

4 In stock
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SKU: WAC4P25NC/24
£13.49

3-£13.15£0.34£13.49
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10-£12.48£1.01£13.49
20-£12.14£1.35£13.49
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Wago 788-303 Wago 788 Relay Module with 1 Changeover Contact - 12V DC 16A 2.5 mm² Grey 1Wago 788-303 Wago 788 Relay Module with 1 Changeover Contact - 12V DC 16A 2.5 mm² Grey 2

Wago 788-303 Relay Module with 1 Changeover Contact – 12V DC 16A 2.5mm² Grey

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SKU: 788-303
£8.75
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FuseBox TPN16FB Fusebox TPN16FB 16 Way 125A Three Phase Board 1FuseBox TPN16FB Fusebox TPN16FB 16 Way 125A Three Phase Board 2

Fusebox TPN16FB 16 Way 125A Three Phase Board

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SKU: TPN16FB
£265.11
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FuseBox MT10D061 FuseBox MT10D061 6A Single Pole 10kA D Curve MCB

FuseBox MT10D061 6A Single Pole 10kA D Curve MCB

11 In stock
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SKU: MT10D061
£3.22
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Fusebox Consumer Unit MCB D Type

FuseBox MT10D162 16A Double Pole 10kA D Curve MCB

5 In stock
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SKU: MT10D162
£6.68
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Fusebox Consumer Unit MCB D Type

FuseBox MT10D322 32A Double Pole 10kA D Curve MCB

11 In stock
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SKU: MT10D322
£6.68
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Selection of Consumer Units, TPN Distribution Boards, Circuit Protection, Rotary Isolators, Meter Tails, Fused Switches and Accessories.

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Circuit protection in the UK is governed by the wiring regulations outlined in the British Standard BS 7671. This standard, also known as the IET Wiring Regulations, sets out the requirements for the design, installation, and maintenance of electrical installations in the UK. Circuit protection is a crucial aspect of electrical installations to ensure the safety of people and property.

Here are some key aspects of circuit protection according to BS 7671 and the devices commonly used in the UK market:

  1. Circuit Breakers: Circuit breakers are essential devices for protecting electrical circuits. BS 7671 specifies requirements for the selection and installation of circuit breakers. They come in various types, including:
    • Miniature Circuit Breakers (MCBs): MCBs are commonly used to protect individual circuits. They trip when there’s an overload or a short circuit.
    • Residual Current Devices (RCDs): RCDs are designed to protect against electric shock. They disconnect the circuit if they detect an imbalance in current, indicating a fault.
    • Combination RCD/MCB Devices: These devices combine the functions of both MCBs and RCDs in a single unit. They are often used for socket outlets.
  2. Fuses: While less common in modern installations, fuses may still be used for circuit protection. They work by melting when there’s an excess current, breaking the circuit.
  3. Overcurrent Protection: BS 7671 requires that circuits are protected against overcurrents. This is typically achieved through the use of circuit breakers, fuses, or other protective devices.
  4. Earthing and Bonding: Proper earthing and bonding are essential for safety. This ensures that in the event of a fault, the fault current is safely directed away from people and property.
  5. Surge Protection: Surge protection devices may be required to protect against voltage surges or lightning strikes, especially for sensitive electronic equipment.
  6. Arc Fault Detection: In certain installations, arc fault detection devices may be used to detect and disconnect circuits in the presence of dangerous arc faults.
  7. Circuit Isolation: BS 7671 also specifies requirements for circuit isolation devices such as switches and isolators.
  8. Cable Sizing: The standard provides guidelines for selecting the correct cable size to ensure that the cables can safely carry the intended load without overheating.
  9. Circuit Labels and Documentation: Proper labeling and documentation of circuits are important for maintenance and safety. BS 7671 outlines requirements for labeling and record-keeping.

It’s important to note that regulations and standards may be updated over time, so it’s essential to consult the latest version of BS 7671 and any local regulations or codes that may apply to your specific location or type of installation. Additionally, electrical work should be carried out by qualified and competent electricians to ensure compliance with safety standards.

 

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