



MK Sentry Y8678SMET 18th Edition All Metal 21 Way (15 Useable Ways ) Pre-Populated Twin RCD Flexible Consumer Unit With 100A Switch Disconnector Isolator & 2 x 100A 30mA Type A RCDs
Y8678SMET
MK Sentry Y8678SMET All Metal 21 Way Twin RCD Consumer Unit – Pre-Populated, 100A Main Switch, 2 x 100A Type A RCDs, 18th Edition Compliant
The MK Sentry Y8678SMET is a fully pre-populated 21-way consumer unit featuring 15 useable outgoing ways, designed for compliance with the 18th Edition Wiring Regulations. Equipped with a 100A main isolator, dual 100A 30mA Type A RCDs, and 12 MCBs (3 x 6A, 2 x 16A, 2 x 20A, 4 x 32A, 1 x 40A), this unit offers flexibility, safety, and convenience for modern residential or commercial applications.
- Pre-Fitted and Ready to Install: Supplied with switch disconnector, 2 Type A RCDs, and 12 MCBs to save time and ensure compliance.
- 15 Useable Ways: Offers a generous configuration capacity, with space for 3 additional one-module products for future expansion.
- Dual 100A Type A RCDs: Provides full 30mA protection across two groups of circuits, supporting flexible layout and fault isolation.
- 18th Edition Compliant: Built to BS EN 61439-3 and IP2XC (BS EN 60529), with design recommendations for RCBO use on non-RCD circuits.
- Premium Construction: Zintec steel enclosure, top-hinged door, offset incomer, floating busbar, and backed-out captive screws ensure safe, fast, and neat installation.
Supplied Components
- Main Switch: 1 x 100A Double Pole Isolator
- RCDs: 2 x 100A 30mA Type A
- MCBs: 3 x 6A, 2 x 16A, 2 x 20A, 4 x 32A, 1 x 40A
- Useable Ways: 15 out of 21 (with space for 3 extra 1-module devices)
Technical Specification
- Material: Zintec Steel (Non-combustible)
- Dimensions: W: 472mm x H: 244mm x D: 116mm
- Ingress Protection: IP2XC (BS EN 60529)
- Standard Compliance: BS EN 61439-3
✅ Choose the MK Sentry Y8678SMET for a large-capacity, fully compliant consumer unit that delivers safe, flexible, and efficient power distribution for modern 18th Edition-compliant installations!

Range | Circpro MK Sentry |
Sensitivity | 30 mA |
Product | Consumer Unit - Pre Populated |
Voltage | 230|240 V |
Current Rating | 100A |
Rcd Sensitivity | 30 mA |
Body Material | Steel |
Outgoing Ways | 21 Way |
Incomer Included | Y |
Incomer Type | Switch Disconnector/RCD |
Incomer Current Rating | 100 A |
Rcd S Included | Y |
Delivery Costs
Our standard delivery charge to UK mainland addresses is £5.90 ex-VAT.
Take advantage of FREE* Delivery when you spend over £100 (per order) ex-VAT.
*Delivery charges to JE, GY, TR, BT, IM, IV, HS, KW, ZE and certain PA post codes are £12.00 ex-VAT.
Solar Panels, Batteries and Inverters
Due to their size all solar panels, batteries and inverters orders up to 50 qty will be despatched on a pallet and incur a £120** ex-VAT delivery charge.
**£180 ex VAT to JE, GY, TR, BT, IM, IV, HS, KW, ZE and certain PA post codes.
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