Knightsbridge SN8410 20A 4-Terminal Junction Box – White, 59 mm
The Knightsbridge SN8410 is the manufacturer's white 20A four-terminal junction box, with knockout cable entries and a thermoset-resin casing. The retained product photo shows the lid and four terminals.
- Model: SN8410
- Rating: 20A, 230 V, 50 Hz
- Terminals: four
- Diameter: 59 mm
- Projection: 25 mm
- Construction: thermoset resin; the manufacturer's summary describes a urea outer casing
- Terminal capacity: 3 × 1.5 mm² or 2 × 2.5 mm²
- Protection: IP20, indoor use
- Manufacturer-listed standard: BS EN 60670
- Unit EAN: 5055832955306
Installation: check the circuit, conductor sizes, cable entries and available installation space. Follow the manufacturer instructions and verify that the supply is isolated before work. No maintenance-free or inaccessible-installation approval is asserted.
Manufacturer dimensions

View the full-size SN8410 manufacturer drawing
Manufacturer documents
Finish discrepancy: the current datasheet's heading, photo and EAN identify white SN8410, but its finish row says “Black”. The original PDF below is unaltered. The supplied unit's finish and markings have not been physically checked; confirm them before relying on the conflicting finish row.
- SN8410 manufacturer datasheet — contains finish discrepancy (PDF)
- Manufacturer wiring-accessories instructions — DCJUN22 (PDF)
The current datasheet lists a 25-year manufacturer warranty, subject to the manufacturer's applicable installation and use terms.
📍 Same-day click & collect — 24 Western Avenue, Acton W3 7TZ (Mon–Fri 7:30am–5:30pm · Sat 8am–1pm)
🚚 Free delivery on orders over £50