Twin Screw 100A Main Switch 4 Pole WIS4100

The WIS4100 is a robust 4 pole 100A main switch with twin screw terminals for secure, reliable clamping. Designed for isolating circuits in both domestic consumer units and three-phase distribution boards, it ensures safe disconnection fully in line with the 18th Edition Wiring Regulations.

Compact in footprint and fitted with a colour-coded handle, it integrates easily into electrical enclosures and consumer units. Suitable for both single-phase and three-phase applications, the WIS4100 delivers dependable performance wherever complete circuit isolation is required.

• 100A rated – capable of isolating full board loads
• 4 pole configuration – disconnects all live and neutral conductors
• Twin screw terminals – prevents loosening and ensures secure cable termination
• Colour-coded handle – clear ON/OFF identification at a glance
• Compact design: 70mm (W) × 103mm (H) × 65mm (D)
• Compatible with main switch isolator setups and multi-pole boards

This main switch is DIN rail mounted and designed for quick fit-outs in consumer units and distribution boards. All installation must be carried out by a qualified electrician.

• Ensure cable terminations are fully tightened into twin screw terminals
• Mount at the head of the board on the main busbar
• Suitable for single-phase and three-phase board configurations
• Install in ventilated enclosures to prevent overheating

What does a 4 pole main switch do?

A 4 pole main switch isolates all live and neutral conductors. It’s typically used in three-phase boards to safely disconnect every phase and neutral simultaneously.

Is this suitable for domestic consumer units?

Yes. The WIS4100 is often used in domestic circuit protection boards and light commercial setups that require complete isolation. Check your consumer unit supports 4 pole devices before fitting.

Are the terminals secure for larger tails?

Yes. The twin screw terminals are designed for solid clamping and are compatible with the standard meter tails used in 100A consumer unit enclosures.

Can I use this in single-phase setups?

Yes. Although it is a 4 pole switch, it can be used to isolate live, neutral, and auxiliary conductors in single-phase applications where full disconnection is needed.

What categories does this product relate to?

The WIS4100 is part of our wider Main Switches & Rotary Isolators range. It is commonly installed alongside Three Phase Boards and electrical enclosures in domestic and commercial systems.