Fuses vs. Circuit breakers: what are the differences?


 Both fuses and circuit breakers are used to ensure the safety of electrical circuits in a home. Although fuses and circuit breakers have similar characteristics, there are differences in functionality, resetting capabilities, response time and protection. Understanding the differences is important for all homeowners, especially if they are considering an electrical upgrade. 

Difference in functionality: both fuses and circuit breakers protect electrical components from exceeding their current limit. Fuses are much simpler in design and contain sacrificial components. When the current from a fuse generates heat, it begins to melt, resulting in a blown fuse. A circuit breaker can detect an electrical overcurrent that causes the circuit breaker to trip. Circuit breakers are more complex and designed as an electromechanical mechanism.  

Difference when resetting: The main difference when resetting a circuit breaker is that you can switch it back on manually yourself. This allows you to safely restore the power supply. If your circuit breaker is not hot to the touch, you can switch it back on. If you notice that your circuit breaker keeps tripping, or if it smells of burning, you should contact an electrician to check your circuit breaker panel. An electrician must replace a blown fuse immediately, unlike a circuit breaker that can be reset. You can recognise a blown fuse when an electrical switch or appliance stops working.  

Difference in response time/speed: The response time depends on factors such as the type of fuse and the size of the overcurrent. The response time of a circuit breaker also depends on its type and design. The thermal component of this type of circuit breaker is designed to withstand overloads and the magnetic component can respond quickly to short circuits. 

Difference in protection: A fuse protects households and electrical appliances from overloads, while a circuit breaker can protect against overloads and short circuits. An overload occurs when too much current flows in the electrical wiring, causing the wiring to heat up and melt. A short circuit occurs when two conductors have different voltages and the current then takes the path of least resistance.  

If you have electrical issues at home, make us a call. Emergency Electrician 24H is available round the clock.

Location: London, UK

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