Fusebox Main Switches for TPN Distribution Boards

Showing all 10 results

FuseBox 100A 4 Pole Main Switch

Usually Dispatched within 2-4 Working Days*

SKU: IT1004

£16.50 £19.80

FuseBox 125A 4 Pole Main Switch

Usually Dispatched within 2-4 Working Days*

SKU: IT1254

£20.15 £24.18

FuseBox 125A 3 Pole Main Switch + Unswitched Neutral

1 In stock

More Available within 2-3 Working Days*

SKU: IT1253N

£21.00 £25.20

FuseBox 63A 30mA Four Pole Type A RCD

Usually Dispatched within 2-4 Working Days*

SKU: RTA0630304

£23.50 £28.20

FuseBox 63A 30mA Four Pole Type B RCD

4 In stock

More Available within 2-3 Working Days*

SKU: RTB630304M

£114.76 £137.71

FuseBox 80A 30mA Four Pole Type A RCD

5 In stock

More Available within 2-3 Working Days*

SKU: RTA0800304

£26.50 £31.80

FuseBox 100A 30mA Four Pole Type A RCD

4 In stock

More Available within 2-3 Working Days*

SKU: RTA1000304

£28.90 £34.68

FuseBox 100A 100mA Four Pole Type A RCD

5 In stock

More Available within 2-3 Working Days*

SKU: RTA1001004

£28.90 £34.68

FuseBox 100A 300mA Four Pole Type A RCD

5 In stock

More Available within 2-3 Working Days*

SKU: RTA1003004

£28.90 £34.68

FuseBox 100A 100mA Four Pole Type A Time Delayed RCD

Usually Dispatched within 2-4 Working Days*

SKU: RTA1001004S

£31.00 £37.20

Showing all 10 results

In electrical distribution boards and installations, the choice of main switches, whether they are 3-pole or 4-pole, depends on various factors, including the electrical supply system, safety requirements, and specific installation needs. In the context of BS 7671 (the IET Wiring Regulations), which governs electrical installations in the UK, the selection of main switches should be made in accordance with the regulations and safety standards. Here’s some information on 3-pole and 4-pole main switches for distribution boards:

3-Pole Main Switch:
- A 3-pole main switch has three conductors and is typically used in single-phase and three-phase systems where a neutral conductor is not required for disconnection. It is commonly used in three-phase installations without a neutral, such as certain industrial or commercial setups.
- In a 3-pole main switch, the three conductors typically disconnect all three phases (L1, L2, L3) when the switch is turned off. This allows for the isolation of the phases but does not interrupt the neutral connection.
- A 3-pole main switch is used when there is no need to disconnect the neutral conductor, and it’s important to maintain continuity in the neutral path, which is common in many three-phase systems.
4-Pole Main Switch:
- A 4-pole main switch has four conductors and is used in systems where the neutral conductor must also be disconnected for safety or operational reasons. This is common in distribution boards supplying final circuits in buildings and installations.
- In a 4-pole main switch, all three phases (L1, L2, L3) and the neutral (N) are disconnected when the switch is turned off. This provides complete isolation of both the phase and neutral conductors.
- 4-pole main switches are often required in domestic and commercial installations to ensure that all live conductors (phases and neutral) are disconnected for maintenance or safety purposes.
BS 7671 Compliance:
- When selecting and installing 3-pole or 4-pole main switches in distribution boards, it is essential to adhere to the requirements of BS 7671 and any other relevant safety standards or regulations applicable to your specific installation.
- BS 7671 provides guidance on the selection, installation, and use of main switches, ensuring that they are suitable for the intended purpose and comply with safety requirements.
- The specific circumstances of your installation, the type of loads connected, and the safety considerations will dictate whether a 3-pole or 4-pole main switch is appropriate.

It’s crucial to consult with a qualified electrician or electrical engineer when designing and installing distribution boards to ensure that the choice of main switch aligns with the electrical system requirements and safety standards applicable to your specific installation. Compliance with BS 7671 is essential for electrical safety and regulatory compliance in the UK.

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