Metal Fuse Switch 100A with 3 × Fuses (WFMS100/3F)
18th Ed. Compliant
2-Year Warranty
UK Stock
Free Delivery £30+
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The WFMS100/3F is a 100 A metal fuse switch supplied with three 22 × 58 mm cartridge fuses (63 A, 80 A & 100 A) to suit your installation requirements. Designed for fused mains isolation, it provides a complete, regulation-compliant solution for protecting meter tails and sub-main feeds in domestic...
The WFMS100/3F is a 100 A metal fuse switch supplied with three 22 × 58 mm cartridge fuses (63 A, 80 A & 100 A) to suit your installation requirements. Designed for fused mains isolation, it provides a complete, regulation-compliant solution for protecting meter tails and sub-main feeds in domestic or light-commercial installations.
Installer Tip: Ideal when you need a pre-fused isolator straight from the meter — for example, feeding a consumer unit, garage sub-board, or EV distribution panel. Choose the cartridge rating that matches your downstream cable size to stay within BS 7671 Reg 433.1.1.
- 100 A double-pole switch-fuse assembly – factory-fitted and ready to mount
- Supplied with 3 fuse cartridges (63 A / 80 A / 100 A) for on-site selection
- Compact metal enclosure – powder-coated and pre-drilled for fast install
- 22 × 58 fuseholders – industry-standard size for easy replacements
- Complies with BS EN 60947-3 & 18th Edition Amendment 2
| Model | Main Switch | Fuses Included | Extras | Typical Use |
|---|---|---|---|---|
| WFMS100 | 100 A 2 Pole | None | – | Meter-to-CU isolation (no fuses) |
| WFMS100/3F | 100 A 2 Pole | 63 A / 80 A / 100 A | – | Fused domestic incomer / sub-main |
| WFMS100/3FSP | 100 A 2 Pole | 3 × Fuses | Type 2 SPD | Surge-protected incomer |
| WFMS/3P | 125 A 4 Pole | 3 × Fuses | – | Three-phase distribution |
Each unit is factory-assembled with a 100 A main switch and DIN-mounted fuseholder, ensuring solid terminations and a consistent, professional finish across the Power & Data UK fuse-switch range.
What fuses are included?
The WFMS100/3F comes with 63 A, 80 A and 100 A cartridges so you can select the correct rating for your cable size and load.
Can I add surge protection later?
Yes – if you need integrated SPD protection, choose the WFMS100/3FSP, which includes a Type 2 SPD for 18th Edition compliance.
What’s the advantage over a basic isolator?
This fused version provides both isolation and over-current protection – ideal between the meter and CU, or for garage and outbuilding feeds.
Are replacement fuses available?
Yes – standard 22 × 58 cartridge fuses (63 A–100 A) are stocked and can be reordered through our fuse range.
Is it suitable for three-phase systems?
No – use the WFMS/3P for three-phase setups.
- Model: WFMS100/3F
- Main Switch Rating: 100 A Double Pole (AC-22 A duty)
- Fuse Holder Type: 22 × 58 cartridge holder
- Fuses Supplied: 63 A, 80 A & 100 A
- Enclosure Type: Metal-clad surface mount – powder-coated steel
- Dimensions (W × H × D): 130 × 238 × 87 mm
- Ingress Protection: IP40 (indoor use)
- Voltage Rating: 230 V AC / 50 Hz
- Compliance: BS EN 60947-3 / BS 7671 Amendment 2
Supplied with fuse cartridges and pre-fitted 100 A main switch. Select the correct fuse size before energising and record ratings on the circuit schedule.
- Mount on a flat, non-combustible surface
- Choose rear or side knockouts for cable entry
- Ensure enclosure bonding continuity (BS 7671 Reg 411.3.1.1)
- Tighten terminals to manufacturer torque values
- Confirm correct fuse size for cable & breaker coordination
