Meter Isolator with 100A Main Switch & Surge Protection WEC440SP
The WEC440SP is a compact 4-module Meter Supply Isolator with a 100A Double Pole Main Switch and built-in 40kA Type 2 Surge Protection Device (SPD). Designed to be installed between the meter and consumer unit, it provides essential isolation while protecting circuits from voltage transients, lightning strikes, and power surges....
The WEC440SP is a compact 4-module Meter Supply Isolator with a 100A Double Pole Main Switch and built-in 40kA Type 2 Surge Protection Device (SPD). Designed to be installed between the meter and consumer unit, it provides essential isolation while protecting circuits from voltage transients, lightning strikes, and power surges.
This dual-function unit is a space-saving upgrade option for new installs or retrofits - ideal when adding surge protection without modifying the main board. Fully sealable for compliance and security.
- 100A Double Pole isolator – main supply isolation
- Type 2 SPD built-in – 40kA discharge capacity
- Compact 4-module enclosure – fits meter cupboard or DIN rail tray
- Compatible with 16mm and 25mm meter tails
- Sealable design – two-part lid and tamper-resistant screws
Protects against transient overvoltages and enhances system resilience without taking up space in the consumer unit. Built for electricians looking to upgrade existing installations to meet 18th Edition best practice.
Dimensions mm: W95 x H145 x D82
Where should this unit be installed?
Between the meter and consumer unit. It provides upstream isolation with added surge protection without needing to modify the main board.
Is it compliant with 18th Edition Amendment 2?
Yes – it includes Type 2 SPD functionality and is often used to meet best-practice surge protection standards in residential and commercial installs.
Can I use this with 25mm meter tails?
Yes – the terminal blocks are compatible with both 16mm and 25mm tails.
- Product Code: WEC440SP
- Main Switch Rating: 100A Double Pole
- Surge Arrestor: Type 2 SPD, 40kA Max Discharge
- Modules: 4
- Dimensions: 95mm (W) x 145mm (H) x 82mm (D)
- Voltage: 230V AC
- Earthing Compatibility: TT and TN-S
- Meter Tail Support: 16mm² or 25mm²
- Ingress Protection: IP20
- Standards: BS EN 61439-3 / BS EN 61643-11
This isolator is typically installed between the incoming meter and the consumer unit to provide both isolation and surge protection. It’s compatible with standard meter boards or side-mount DIN setups. Always follow BS7671 guidelines and DNO/local supplier requirements.
- Use correct torque when securing meter tails (recommended: 2.5Nm)
- Ensure SPD earth connection is as short as possible
- Seal lid screws post-install to prevent tampering
- Padlockable for enhanced security on rental or commercial sites
