Fused Connection Unit, What Is A fused Connection Unit.

Fused connection units are electrical connections that are created specifically between an electrical wire and an appliance. Typically, appliances like cookers are wired into the electrical circuit on a fused connection unit.

As they do not utilize the conventional plug or socket, it is recommended that they be fitted or uninstalled by a trained electrician. Additionally, they are called fused spurs or fused spur switches.

A fused connection unit (or FCU) is an electric socket equipped with an inbuilt fuse that is used to link permanently affixed devices to a circuit, including refrigerators, washers, as well as waste disposal machines.

It is basically similar to a fused plug and socket linked to an appliance through a cable, except that it is permanently plugged into the socket, and also the fuses are very often simpler to replace when necessary.

Fused connection units have a fuse holder integrated into the faceplate, which is covered by an easy-access cover.

They typically accept 3- to 13-amp fuses and are capable of securely powering appliances up to 3.1kW. Fused connection devices are available in switched or un-switched configurations, and some include an indicator light.

As fused connection units are the equivalent of a fused plug and socket, they may be linked by substituting an FCU for a standard plug socket (providing it is a 1-gang socket).

Alternately, you may run it on a different wire from an existing normal socket on the circuit, which adds another layer of isolation.

FCUs may be fully hardwired, with the connection to the appliance concealed inside the wall, or they can have a visible cable permanently attached to the faceplate.

The Complete Guide to Fused Connection Units and How They Work

This comprehensive overview explains when and how these fused connection devices are utilized.

Why Use a Fused Connection Unit?

With greater power, higher voltage electrical equipment, fused connection units are utilized instead of ordinary plug sockets.

Ovens, dishwashers, washing machines, boilers, thermostats, as well as refrigerators are all common applications in a home environment. Additionally, electrical equipment used in restrooms, like heaters, may have fused spurs.

The fused connection unit enables the gadget to function as a branch or ‘spur’ of the building’s main electrical circuit (‘ring main’). Operating outside the ring main adds another layer of security.

The following are some typical applications for fused connection units:

• Kitchen appliances integrated into the cabinetry, such as dishwashers, washing machines, and refrigerator-freezers

• Low-energy hobs and ovens

• Range hoods

• Exhaust fans

• Boilers

• Heaters powered by electricity

How Does a Fused Connection Unit Work?

Fuses in plugs are safety mechanisms that safeguard the lead, not the appliance. They will blow if excessive current is sent through them as a result of an overload or a malfunction.

This is because they are purposefully designed to be a weak link in the system. The blown fuse will therefore turn the power off, preventing the lead as well as an appliance from overheating (which can cause a fire).

What are the Advantages & Disadvantages of Fused Connection Units?


Ensures safety of appliances: Due to the need to change fuses for overloading or fault clearance, the probability of operators re-closing into a faulty state is reduced.

Visible blade to comply with numerous plant safety regulations demanding observation of a “visible break” to assist in ensuring voltage separation is only accessible in the industry through the fusible disconnect switch.

Due to the rejection characteristic of fuses, it is difficult to substitute less competent fuses, guaranteeing that the design purpose is followed.

Costs: Depending on the size and kind of breaker needed for the application, the initial cost may be a trade-off.


Both overload and large magnitude problems need a skilled electrician to get access to the bucket in order to test and replace fuses.

Extra downtime is required to replace fuses for each low-level failure. (on low-level faults, molded case circuit breakers (MCCCBs) may be reset). There is no safety in a single phase.

Costs associated with fuse replacement, especially for low-level overloads, will increase the life cycle expense, depending on the magnitude as well as the frequency of overload occurrences.

What are the Best Brands of Fused Connection Units in the Market?

The best FCU brands include:

· MK Electric

· Contactum

  • Schneider Electric

· RS Pro

When to use a fused connection unit

As mentioned before, a fused connection unit is an electrical component that incorporates a fuse. The electrical supply is routed via the fuse and from there to the load or device.

If the load generated by the appliance exceeds the circuit’s capacity, the fuse blows and disconnects the supply, avoiding overheating as well as fire.

With this in consideration, a fused connection unit is often utilized when there is a possibility that the appliance or item using electricity may consume excessive current.

They are needed for this purpose when installing extra radial circuits. If you add four extra plugs to an existing circuit, you can plug in and switch on a washing machine, tumble dryer, vacuum cleaner, and kettle simultaneously.

The following are some typical applications for fused connection units:

  • Converting an existing radial or ring main into a new radial circuit
  • To power a piece of high-current equipment, such as a washing machine, a stove, a dishwasher, or a boiler.
  • For use with electric powered showers

Are fused connection unit double pole

A fused connection unit is a component of an electrical supply system that includes a fuse. A two-pole fuse connecting unit is a variant that adds an additional isolation function. This isolates the live and ground wires, making the switch safe to operate.


The term “fuses connection units” refers to electrical switches that are equipped with a single fuse, which is a safety device that breaks the connection when an excessive amount of current flows through it, preventing shocks and electrical fires.

Fuses are part of a larger group of electrical components known as ‘circuit breakers,’ all of which perform a largely identical function in a variety of situations.