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Fused Connection Units & Spurs

A fused connection unit, often called a fused spur, feeds one fixed appliance through its own fuse, whether a boiler, an immersion heater or a towel rail. The Knightsbridge range here includes switched and unswitched 13A spurs, units with a neon indicator or a flex outlet, RCD fused spurs, IP66 outdoor spurs, metal clad spurs and Grid fused modules, along with 20A flex outlet plates, double pole switches and 45A cooker connection units.

Choosing Fused Connection Units & Spurs

Pick a spur by the appliance it feeds, then by where it is fitted.

Switched, unswitched, neon and flex outlet

A switched spur such as the SF6300PC adds an on/off switch to the fuse, while the CU6000NF is an unswitched unit with the fuse alone. A neon shows when the circuit is live, and a flex outlet lets the appliance cable enter through the plate: the PM6300NF has both, in anthracite.

RCD spurs

An RCD fused spur adds earth-leakage protection to a single appliance. The CU6RCD in white, the M6RCD in metal clad steel and the PM6RCD in anthracite are all 30mA Type A units, and each one resets itself after a power outage. The CU6RCD trips in 40ms and needs a mounting box at least 35mm deep.

Outdoor, metal clad and Grid

For an outside wall, the OP63N and OP6N are IP66 and IK06 polycarbonate units with a transparent lid, and the OP63N has multiple 20mm cable entries. Metal clad spurs such as the M6300 come complete with a back box. For a Grid plate, the GDM011U is a 13A fused module that clips into a mounting frame sold separately.

NeedExampleDetail
Screwless switched spurSF6300PC13A, BS 1363-4, polished chrome
White moulded spurCU6300N13A, neon, BS 1363-2
RCD spurCU6RCD30mA Type A, 40ms trip
Outdoor spurOP63NIP66, IK06, neon
Cooker connectionCU834045A, BS 5733

Flex outlets and cooker circuits

A 20A flex outlet plate connects an appliance cable to fixed wiring: the SF8342MW takes 3 x 2.5mm² or 2 x 4.0mm² in its terminals and is made for refrigerators, water heaters and central heating boilers. The CU8340 and SN8340 are cooker connection units with a clamp and a bottom knockout for the outgoing cable, and the FP8331NPC is a 45A double pole switch for isolating cooking appliances. Metal plates such as the FP6300PC are certified to BS 1363-4, and white moulded units such as the CU6000 to BS 1363-2. Finishes include white, anthracite, matt black, brushed and polished chrome, antique and polished brass, gunmetal, pearl, black nickel and smoked bronze.

Related categories

Browse by type in fused spurs, RCD safety spurs and cooker switches. Outlet plates are also in flex outlet plates, Grid parts in Grid switches, and spare fuses in fuses.

Brands we stock in Fused Connection Units & Spurs

Knightsbridge.

Frequently asked questions

What does an RCD fused connection unit do?

An RCD fused connection unit adds earth-leakage protection to one appliance, cutting the supply if current leaks to earth, while its fuse protects the appliance flex. Look for a Type A unit with a sensitive tripping current for personal protection. Some reset automatically after a power cut. The range here includes RCD fused spurs in white, metal clad and anthracite finishes.

How do you lock out a fused connection unit?

Switch the unit off, remove the fuse and keep it with you, then fit a lock-off device so nobody can refit it. Where possible, isolate the circuit at the consumer unit as well. Prove the circuit dead with a voltage tester before starting work, and label the unit to show work is in progress. The range here includes switched and unswitched fused spurs.

  • Established 1975
  • Birmingham trade counter
  • UK-only supply

Written by the West Midlands Electrics technical team

Updated

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