



MK Sentry Y7678SMET AM3 All Metal 21 Way (15 Useable Ways ) Pre-Populated Twin RCD 63A&80A RCD Flexible Consumer Unit With 3x6A, 2x16A, 2x20A, 4x32A & 1X40A MCBs
Y7678SMET
MK Sentry Y7678SMET All Metal 21 Way Twin RCD Consumer Unit – Pre-Populated, 100A Main Switch, 63A & 80A RCDs, Amendment 3 Compliant
The MK Sentry Y7678SMET is a high-capacity, fully populated 21-way twin RCD consumer unit, designed for safe and flexible circuit protection in line with Amendment 3 to BS 7671:2008. Supplied with a 100A main switch, one 63A and one 80A 30mA RCD, and 12 MCBs (3 x 6A, 2 x 16A, 2 x 20A, 4 x 32A, 1 x 40A), it supports up to 15 useable ways for outgoing circuits. This split-load configuration offers full RCD protection and is ideal for larger residential or commercial applications.
- Pre-Populated Protection: Includes 12 MCBs and twin RCDs—saving installation time and ensuring a compliant, ready-to-go solution.
- Flexible Split Load Layout: Supports up to 15 RCD-protected outgoing ways, configurable as 14/1, 1/14 or anything in between.
- Twin RCD Safety: 1 x 63A and 1 x 80A 30mA RCDs allow separation of circuits by area or function, reducing nuisance tripping.
- 100A Main Switch: Double pole isolator ensures full-board control for safe maintenance and disconnection.
- Amendment 3 Compliant: Non-combustible Zintec steel construction with floating busbar and offset incomer meets the latest fire safety standards.
Supplied Components
- Main Switch: 1 x 100A Double Pole Isolator
- RCDs: 1 x 63A 30mA, 1 x 80A 30mA
- MCBs: 3 x 6A, 2 x 16A, 2 x 20A, 4 x 32A, 1 x 40A
- Useable Ways: 15 out of 21 total ways
Technical Specification
- Material: Zintec Steel (non-combustible)
- Dimensions: H: 244mm x W: 472mm x D: 116mm
- Ingress Protection: IP2XC
- Compliance: BS 7671:2008 Amendment 3, BS EN 61439-3
✅ Choose the MK Sentry Y7678SMET for a spacious, fully compliant, and installer-friendly consumer unit offering comprehensive RCD protection across high-load or multi-zone installations!

Rcd 2 Rating | 63 A |
Range | Circpro MK Sentry |
Sensitivity | 30 mA |
Product | Consumer Unit - Pre Populated |
Type | Twin RCD |
Voltage | 230|240 V |
Mounting | Surface |
Current Rating | 100A |
Rcd Rating | 63 A |
Rcd Sensitivity | 30 mA |
Rcd 2 Sensitivity | 30 mA |
Body Material | Steel |
Outgoing Ways | 21 Way |
Incomer Included | Y |
Incomer Type | RCD |
Incomer Current Rating | 63 A |
Rcd S Included | Y |
Number Of Rcd S | 2 |
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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