Fusebox F3021MZ 21 Way 100A Main Switch Consumer Unit with Type 2 SPD
£96.73
Ex. VAT
(over £100+VAT, applies to zone A only , £6 +VAT otherwise)
Order online & collect in store
This is the Fusebox F3021MZ 21 Way 100A Main Switch Consumer Unit with Type 2 SPD – Surge-Protected F3 Series Board available at SparksDirect.co.uk for the best price.
Please note: this Fusebox Consumer unit is unpopulated; the MCBs need to be ordered separately. See the Accessories section for more accessories for this board, and see the 6kA Standard RCBOs (codes starting with RTA06), Compact RCBO type A curve B (RTAMB), compact RCBO type A curve C (RTAMC), Bi-directional mini RCBO type A curve B (RTAMBxxBD), Bi-directional mini RCBO type A curve C (RTAMCxxBD), AFDDs (AFDD0xx), MCB curve B (MT06B), MCB curve C (MT06C), or Henley Connector Blocks. To be ordered separately.
The Fusebox F3021MZ is a premium 21 Way consumer unit designed to meet the needs of large residential, garage, light-commercial and industrial electrical installations. This advanced distribution board features a 100A double-pole main switch incomer for safe isolation of the incoming supply, coupled with a factory-fitted Type 2 Surge Protection Device (SPD) that helps protect connected equipment from damaging transient over-voltages such as lightning strikes or internal switching spikes.
Part of Fusebox’s respected F3 series, the F3021MZ combines robust build quality with installer-friendly engineering. Its ample 21 usable outgoing ways allow plenty of space for modular circuit protective devices like RCBOs or MCBs, giving electrical contractors flexibility in configuring lighting, socket, appliance and specialist circuits. With a sturdy metal powder-coated enclosure and comprehensive knock-out options, it supports neat, compliant installations that stand the test of time.
Whether you’re completing a new build, upgrading an existing panel, or specifying a board for commercial or EV charging applications, the F3021MZ delivers professional performance, built-in surge defence and expanded circuit capacity in one reliable unit.
Technical Specifications
- Product: Fusebox F3021MZ 21 Way Consumer Unit with SPD
- Brand: Fusebox
- Series: F3 Series Type 2 SPD Main Switch Consumer Units
- Number of Usable Ways: 21 outgoing ways
- Main Switch (Incomer): 100A double-pole main switch (included)
- Surge Protection: Type 2 SPD (single module, direct-to-busbar) – no MCB required
- Integrated SPD: Yes – protects against transient over-voltages
- Standards Compliance: BS EN 61439-3 and 18th Edition Amendment 3 wiring regulations
- Voltage Rating: 230V AC, 50/60 Hz
- IP Rating: IP2XC (internal finger-safe protection)
- Enclosure Material: 1mm electro-galvanised steel (zinc) with RAL 9001 white powder-coated finish
- Mounting: Surface-mounted consumer unit
- DIN Rail: 35mm raised and removable DIN rail for device mounting
- Earth & Neutral Bars: Top-mounted, labelled terminal bars
- Cable Knockouts: Multiple 20mm & 32mm round (top/bottom/rear) and 40mm (sides)
- Tail Clamp: Included (meter tails clamp)
- Module Capacity: 24 modules
- Dimensions (Approx): 259mm (height) x 486mm (width) x 113mm (depth)
- Weight: 5kg
- Finish: White powder-coated steel
- Compatible Devices: Accepts Fusebox RCBOs or MCBs (sold separately)
- Suitable For: Residential installations, garages, workshops, light commercial boards and surge-protected circuits.
Three Reasons Customers Recommend This Product
- High Circuit Capacity & Flexibility: With 21 usable outgoing ways, users can configure a wide range of circuits — from lighting and sockets to appliance feeds — using RCBOs or MCBs of choice, making the board a flexible solution for larger installations.
- Built-in Surge Protection: The integrated Type 2 SPD helps protect sensitive electronics and appliances from hazardous voltage spikes, with the SPD connecting directly to the busbar so that all usable ways remain available.
- Installer-Friendly & Standards-Compliant Design: Electricians appreciate the raised DIN rail, reinforced grommet strip, multiple cable entry knockouts and clear earth/neutral bars, all combined with compliance to BS EN 61439-3 and current wiring regulations, making installation quicker and more reliable.
The Fusebox F3021MZ 21 Way Main Switch Consumer Unit with Integrated Type 2 SPD is a robust, versatile and surge-protected distribution board designed for modern electrical systems where safety, capacity and compliance matter. Its durable metal enclosure, generous circuit space and built-in surge defence make it a practical choice for residential and light commercial installations that demand reliable protection and excellent expandability.
Note: Some images and pictures are for reference only. The item may differ from the image/picture due to manufacturer's change. Should you require the exact item in the picture, please call or email us to enquire.
Shipping
Sparks Direct delivers via courier to the UK only; the standard delivery charge is £6 + VAT for all orders under £100 + VAT. If your order is over £120, you get free delivery (unless there's a special delivery charge for the items you wish to order or you're in shipping zone C or D). Full details for shipping charges can be found via Terms and Conditions.
If the items you order are in stock and the order is placed before 1.00pm, delivery can be made within 1-2 working days. If the items are not in stock, we will inform you via email how long it will take or ask for your confirmation if there's a long lead time.
Returns
We offer 30-day returns for unwanted items - please email us to request a returns number which will need to be quoted when the items are returned. For faulty items or items damaged in transit, please advise via email, and an appropriate returns number will be provided. Full details concerning returns and refunds can be found via our Terms and Conditions.
