
MK Sentry YS8666SMET Amendment 3 All Metal 16 Way (8 Useable Ways) Pre-Populated Twin 100A Type A RCD Flexible Consumer Unit With Surge Protection Device and 2x6A, 2x16A, 2x20A, 3x32A, 1x40A MCBs
YS8666SMET
MK Sentry YS8666SMET All Metal 16 Way Twin RCD Consumer Unit – Pre-Populated, 100A Main Switch, 2 x 100A Type A RCDs & SPD, Amendment 3 Compliant
The MK Sentry YS8666SMET is a fully pre-populated 16-way twin RCD consumer unit, offering 8 useable outgoing ways, and full compliance with Amendment 3 to BS 7671:2008. Supplied with a 100A double pole isolator, two 100A 30mA Type A RCDs, a Surge Protection Device (SPD), and 10 MCBs (2 x 6A, 2 x 16A, 2 x 20A, 3 x 32A, 1 x 40A), this unit ensures complete protection and flexible circuit separation for residential and commercial environments.
- Pre-Populated for Convenience: Includes 10 MCBs, dual RCDs, a 100A main switch, and a Surge Protection Device for immediate, regulation-compliant installation.
- Dual 100A Type A RCDs: Offers split circuit protection with full 30mA coverage, improving fault isolation and circuit organisation.
- Integrated SPD: Protects sensitive electronic equipment from transient overvoltages caused by lightning or switching surges.
- Fully Amendment 3 Compliant: Zintec steel construction with floating busbar system, offset incomer, top-hinged door, and IP2XC protection rating meets latest fire and wiring safety standards.
- Installer-Friendly Design: Supplied with a full metal DIN rail, colour-coded earth and neutral bars, captive combi-head screws, and large knockouts for quick, neat installations.
Supplied Components
- Main Switch: 1 x 100A Double Pole Isolator
- RCDs: 2 x 100A 30mA Type A
- MCBs: 2 x 6A, 2 x 16A, 2 x 20A, 3 x 32A, 1 x 40A
- Surge Protection: 1 x SPD module
- Useable Ways: 8 out of 16 total ways populated
Technical Specification
- Material: Zintec Steel (non-combustible)
- Dimensions: H: 244mm x W: 382mm x D: 116mm
- Ingress Protection: IP2XC (BS EN 60529)
- Compliance: BS EN 61439-3, BS 7671:2008 Amendment 3
✅ Choose the MK Sentry YS8666SMET for an all-in-one, regulation-ready consumer unit offering full RCD protection, surge protection, and installer-friendly features for reliable and flexible electrical distribution!

Surge Protection Included | Yes |
Range | Circpro MK Sentry |
Product | Consumer Unit - Pre Populated |
Type | Twin RCD |
Voltage | 230|240 V |
Current Rating | 100A |
Body Material | Steel |
Outgoing Ways | 16 Way |
Incomer Included | Y |
Incomer Type | RCD |
Incomer Current Rating | 100 A |
Rcd S Included | Y |
Delivery Options:
- PRIORITY DELIVERY – Next Working Day (All items in stock and ordered before 3 pm) - £7.08 inc-VAT. (£5.90 ex-VAT)
- Orders Over £100 (before VAT): We offer free standard shipping on all orders shipped to UK mainland addresses
- Orders under £100 (before VAT): Our standard delivery fee to UK mainland addresses is £5.90 ex-VAT (£7.08 inc-VAT)
*Delivery charges to JE, GY, TR, BT, IM, IV, HS, KW, ZE and certain PA post codes are £12 ex-VAT for all orders (Prices subject to change).
Items requiring specialist shipping:
- Orders containing Solar Panels, Batteries and/or Inverters: Up to 50 qty will be dispatched on a pallet and incur a £120 ex-VAT delivery charge**.
**Delivery charges to JE, GY, TR, BT, IM, IV, HS, KW, ZE and certain PA post codes are £180 ex-VAT (Prices subject to change).
Contact us if you have any further questions.