Difference Between Fuse And Circuit Breaker

The main difference between the fuse and the circuit breaker is that the fuse is the electrical device that performs its function as a detection and interruption device, while the circuit breaker simply interrupts the supply after receiving a signal from the relay. The switches are explained taking into account various factors such as the principle of operation, reuse, status indication, the requirement of auxiliary equipment, temperature, characteristic curve, its function, protection, the capacity of breakdown, operating time, cost, and mode of operation.

Key Differences

  • The fuse is a device that works with the electrical and thermal properties of the conductive material, while an automatic switch is a device that works with electromechanical principles.
  • Once used, a fuse must be replaced, but the circuit breaker can be reused after correcting the fault in the system.
  • The fuses offer protection against power surges only, while the circuit breaker offers protection against power surges and short circuits (voltage imbalances).
  • A switch or electrical device that is used to detect overload and interrupt power to protect an electrical system is known as a fuse. And a switch or electrical device that is used to interrupt the supply in the event of any problem in the electrical system is known as a circuit breaker.
  • A fuse is small in size. On the other hand, the circuit breaker is great.
  • The fuse has a low cost. On the contrary, the circuit breaker has a high cost depending on its application.
  • The fuse melts automatically in case of current overflow to save the system. On the other hand, the circuit breaker cuts off the supply after receiving the signal from the relay about any fault in the system.
  • The fuse works on the principle of the heating property of a conductive material. On the other hand, the circuit breaker works on the principle of a switching mechanism that is electromechanical.
  • The fuse performs its function as a detection and interrupting device, while the circuit breaker functions solely as an interrupting device.
  • The fuse has a minimum run time, such as 0.002 seconds or even less. On the other hand, the circuit breaker has a relatively long operating time that varies between 0.1 and 0.2 seconds.
  • The fuse can only be used once and then needs to be replaced, while; the circuit breaker can be used over and over again by resetting it.
  • The fuse does not depend on the ambient temperature. On the other hand, the circuit breaker depends on the ambient temperature.
  • The fuse only protects against overloads. On the other hand, a circuit breaker can protect against both, that is, short circuit and overload.
  • The fuse does not provide any indication of status, whereas; the circuit breaker provides a status indication.
  • The fuse is available in a single-pole version. On the other hand, the circuit breaker has single-pole and multi-pole versions.
  • The fuse does not require an auxiliary contact. On the other hand, the circuit breaker is available with auxiliary contact.
  • The fuse is not used as an on / off switch, while the circuit breaker can also be used to turn the circuit on or off.
  • The fuse has low breaking capacity, but the circuit breaker has high breaking capacity.
  • The fuse works automatically. On the other hand, the circuit breaker can be operated both manually and automatically.
  • The fuse that is mainly used in this type of electronic equipment that consumes little current. On the other hand, a circuit breaker used in machines, motors, or electronic equipment that draw a large amount of current.

Difference between fuse and circuit breaker -comparative chart

FuseCircuit breaker
DefinitionA switch or electrical device that is used to detect overload and interrupt power to protect an electrical system is known as a fuse.A switch or electrical device that used to interrupt the supply in case of any problem in the electrical system is known as a circuit breaker.
Operating principleThe fuse works on the principle of the heating property of a conductive material.It works on the principle of an electromechanical switching mechanism.
SizeSmall in size.Large size.
PaperThe fuse performs its function as a detection and interrupting device.It works only as an interrupt device.
costThe fuse has a low cost.The circuit breaker has a high cost depending on its application.
Operating timeThe fuse has a very short operating time, such as 0.002 seconds or even less.The circuit breaker has a comparatively long operating time ranging from 0.1 to 0.2 seconds.
FunctionThe fuse melts automatically in case of current overflow to save the system.The circuit breaker cuts off the supply after receiving the signal from the relay about any fault in the system.
Characteristic curveThe characteristic curve of the fuse shows a displacement due to aging.The characteristic curve of the circuit breaker shows no changes.
ReusabilityIt can only be used once and then needs to be replaced.It can be used over and over again.
ProtectionIt only protects against overloads.A circuit breaker can protect against both, that is, short circuits and overloads.
Dependence on ambient temperatureThe fuse does not depend on the ambient temperature.The circuit breaker is based on ambient temperature or conditions.
Operating modeA fuse works automatically.It can be activated both manually and automatically.
Status indicationThe fuse does not give any indication of status.The circuit breaker gives a status indication.
UseThe fuse that is mainly used in this type of electronic equipment that consumes little current.The circuit breaker is used in machines, motors or electronic equipment that draw a large amount of current.
VersionIt is available in a unipolar version.It has monopolar and multipolar versions.
Auxiliary connectionDoes not require auxiliary connection.The circuit breaker is accessible with the auxiliary connection.
Switch actionIt is not used as an on / off switch.The circuit breaker can also be used on or off the circuit.
Break fitnessThe fuse has a low breaking capacity.The circuit breaker shows a high breaking capacity.

Fuse vs. Circuit Breaker

The fuse is an electrical device that automatically melts in the event of a current overflow to save the system. On the other hand, the circuit breaker is an electrical device or switch that used to interrupt the supply after receiving the signal about the fault in the system.

Therefore, the fuse plays its role as a detection and interrupting device, while the circuit breaker has no role in detecting the problem. It simply interrupts the supply after receiving a signal from the relay. The fuse has a short operating time, such as 0.002 seconds or even less. As soon as a problem occurs, it melts and cuts off the supply. On the other hand, the circuit breaker has a comparatively long operating time ranging from 0.1 to 0.2 seconds because it operates after receiving a message from the relay.

The fuse is an electrical device that can be used only once and then needs to be replaced, while the circuit breaker is an electrical device that can be used over and over again. It can be easily reset for reuse. The fuse works on the principle of the heating property of a conductive material. On the other hand, the circuit breaker works on the principle of a switching mechanism that is electromechanical.

Also, the fuse does not depend on the ambient temperature. On the other hand, the circuit breaker depends on the ambient temperature. The characteristic of the fuse or the characteristic curve shows a change due to aging. On the other hand, the characteristic or characteristic curve of the circuit breaker does not change. The fuse has a low cost while the circuit breaker has a high cost depending on your application.

A fuse can protect against opposite overloads. On the other hand, a circuit breaker can protect against both, that is, short circuit and overload. The fuse does not provide any signal or indication of status. On the other hand, the circuit breaker provides a status signal. The fuse is available in a unipolar version, whereas; the circuit breaker has single-pole and multi-pole versions.

So the fuse is mainly used in electronic equipment that draws little current. On the other hand, the circuit breaker used in machines, motors or electronic equipment that carry a large amount of current.

What is Fuse?

A fuse is a switch or electrical device that is used to detect overload and interrupt power to protect an electrical system. So, it is a safety device. It is made up of porcelain, glass, plastic material, and a thin piece of wire. In case of any fault in the electrical system, that is, current overflow, it automatically melts to break the circuit contact. Therefore, it stops the supply to protect the system from damage.

Therefore, Fuse works on the principle of the heating property of a conductive material. It performs its function as a detection and interruption device. Detects overflow and interrupts supply by breaking contacts. Fuse shows a faster effect. Works in 0.002 seconds or even less. But, as it melts during operation, it must be replaced and cannot be used again. It is small in size and has a low cost.

A fuse has different types depending on residential and commercial use. A simple fuse made of a metal wire or filament that is enclosed in a ceramic or glass and metal housing. In homes, it is connected to a central fuse box, which is the point where the building wiring passes. In the case of normal flow, the fuse will allow unobstructed power to pass between the circuits. But, the filament melts in case of overload to stop the flow of electricity.

Fuses are available in different voltages and ratings to handle different electricity capacities. For a circuit, the best fuse is one that has a slightly higher rating than the normal operating value. The fuse that is mainly used in this type of electronic equipment that consumes little current.

What is the circuit breaker?

A circuit breaker is an electrical switch or device that is used to interrupt the supply in the event of any problem in the electrical system. Its fundamental role is the stream or stream discontinuity. Other devices like relays etc. detect any fault in the system. It detects the fault in the system and sends the signal to the circuit breaker. The circuit breaker acts accordingly and interrupts the supply to prevent damage to the electrical system.

The circuit breaker works on the principle of the switching mechanism which is electromechanical. It has a comparatively long operating time ranging from 0.1 to 0.2 seconds. It can be used over and over again by simply resetting it after solving the problem in the circuit.

It depends on the ambient temperature and the characteristic curve shows no changes. It can protect against both, that is, short circuit and overload. The circuit breaker also provides a status indication. The circuit breaker can also be used on or off the circuit. It can be run both manually and automatically.

The circuit breaker is accessible with auxiliary contact. It has monopolar and multipolar versions and has a high breaking capacity. It is used in machines, motors or electronic equipment that draw a large amount of current. Some hammers have many other features as well. They can also be used for electrical quantity measurement, fault logging, and distribution system and device management, etc.

Advantages of the fuse over the circuit breaker

  • The fuse is a very low cost device compared to the circuit breaker.
  • The fuse is a static device and does not require maintenance compared to the circuit breaker that has moving parts inside that need maintenance and testing to be in good condition for normal operations.
  • The main advantage of the fuse over the circuit breaker is its stable, reliable and high speed operation without noise e. it can stay in the same position for a very long period of time if no fault current is produced. In short, HRS fuses do not deteriorate with age.
  • Another advantage of the rewireable fuse is that it can be easily rewired (replacing the fusible element) in the event that it is blown due to a short circuit or excessive current that melts the fusible elements.

Conclution

The above discussion summarizes that the fuse is the electrical device that is used to detect and interrupt the supply in the event of an overload. On the other hand, the circuit breaker is the electrical device that is used to interrupt the supply in case of a short circuit or overload after receiving a signal from the relay.

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