FuseBox 21 Way 100A Main Switch Metal Consumer Unit with Type 2 SPD | F3021MZ

21 way FuseBox metal consumer unit with 100A main switch and Type 2 SPD fitted. Populate with FuseBox RCBOs or AFDDs for individual circuit protection. Supplied by Alert Electrical for trade and DIY installers.

£103.24 (inc. VAT)£86.03 (exc. VAT)

Secure shopping guaranteed

Feefo logo

Free Delivery on orders over £100

Surge protection comes pre wired in the FuseBox F3021MZ, a 21 way 100A main switch consumer unit in a 1mm steel enclosure to BS EN 61439-3.

A main switch board gives each circuit its own RCBO or AFDD, so a fault on one circuit does not take out the rest of the installation. The 24 module enclosure suits larger homes, extensions and light commercial premises, and a tail clamp is supplied. Type 2 SPD protection helps the installation meet the BS 7671 requirement to consider protection against transient overvoltages.

Key features

  • 21 usable ways
  • 100A main switch incomer
  • Factory fitted Type 2 SPD
  • Tail clamp included
  • 1mm steel enclosure with RAL 9001 powder coat
  • IP2XC protection
  • Removable raised DIN rail
  • Earth and neutral bars positioned at the top
  • Brand: FuseBox
  • Product code: F3021MZ
  • Product type: Main switch consumer unit with SPD
  • Usable ways: 21
  • Enclosure size: 24 module
  • Incomer: 100A main switch
  • Surge protection: Type 2 SPD fitted
  • Dimensions: 486mm(w) x 259mm(h) x 113mm(d)
  • Enclosure: 1mm steel, RAL 9001 powder coated
  • Protection: IP2XC
  • Standard: BS EN 61439-3

Suitable for

Domestic rewires, consumer unit replacements, new builds and RCBO board upgrades.

PAYMENT METHODS

© Copyright 2026, Alert Electrical Limited, All Rights Reserved.

Ecommerce by Imaginaire