How does MCCB circuit breaker work?

Answer 1

A Miniature Circuit Breaker or "MCB" works as a normal electrical circuit breaker but is a much smaller device. As well as electro-mechanical relay technology it includes electronic circuitry to achieve its small overall size. MCBs are now used extensively for consumer power-distribution panels and inside small electrical equipment.

For more information see the answers to the Related Questions and also the Related link shown below.

Answer 2

A simple explanationThe action of a circuit breaker is in some ways very similar way to the action of a fuse: if the flow of current going through it gets too high to be safe, the circuit breaker automatically stops the flow of current.

How a fuse works:

A fuse is a safety device to prevent excess current in the electric circuit.It consists of a thin metal wire with a low melting point in a glass causing. When an electrical appliance is faulty or ground fault exists, there will be an excessive flow of electric current through the circuit and this produces a large amount of heat. A fuse has a fuse rating: if the electric current is over a certain value, its thin metal wire melts and breaks the circuit in order to protect the electrical appliance - and its service wiring - to help prevent a home fire.

After a fuse burns out, we have to replace that fuse with a new one.

How a circuit breaker works:

When an electrical appliance becomes faulty or ground fault exists, excess electric current would flow through the circuit and produce a large amount of heat. A circuit breaker also has a rating: if the electric current is over a certain value,the circuit breaker will "TRIP" (disconnecting power) automatically to break the flow of current in order to protect the electrical appliance - and its service wiring - to help prevent a home fire.

A circuit breaker is more convenient to use than a fuse because you only need to switch it "OFF" then back to "ON" to reset it, so you don't normally have to replace it like you would have to replace a fuse.

A more technical explanation

Most circuit breakers operate on two principles.

First, current flow through the breaker heats a bi-metallic element. The more current, the more heat generated. at a certain temperature, the bi-metal element bends, tripping the breaker. This detection element catches overloads that are just slightly more than the breaker's rating. It takes anywhere from a few minutes to several tens of minutes to trip in this mode.

The second detection method is magnetic. Current flow through the breaker flows through a small magnetic coil. At a certain threshold, the magnetic field is strong enough to move the trip arm, tripping the breaker. This detection method is almost instantaneous, and is usually set for a very large overload.

Many breakers combine these two methods into one breaker. Others, typically used for large electric motor protection, will use one or the other.

There are also specialized breakers designed to detect fault current to ground, called GFCI (ground fault circuit interruptor) and arc-flash breakers.
A circuit breaker is nothing but a mechanical device which holds the input and output contact together through a mechanical lock made with anti spring action. when a heavy current flows a coil which is placed in parallel in the circuit create a magnetic effect sufficient for releasing the spring lock, that makes the contact to open so no voltage passed to output.

Answer 3

A circuit breaker works in a similar way to a fuse.

How a fuse works:

A fuse is a safety device to prevent excess current in the electric circuit.It consists of a thin metal wire with a low melting point in a glass causing. When an electrical appliance is faulty, there will be an excessive flow of electric current through the circuit and this produces a large amount of heat. A fuse has a fuse rating: if the electric current is over a certain value, its thin metal wire melts and breaks the circuit in order to protect the electrical appliance - and its service wiring - to help prevent a home fire.

After a fuse burns out, we have to replace that fuse with a new one.

How a circuit breaker works:

When an electrical appliance becomes faulty, excess electric current would flow through the circuit and produce a large amount of heat. A circuit breaker also has a rating: if the electric current is over a certain value,the circuit breaker will turn to "OFF"automatically to break the flow of current in order to protect the electrical appliance - and its service wiring - to help prevent a home fire.

A circuit breaker is more convenient to use than a fuse because you only need to switch it back to "ON" to reset it, so you don't normally have to replace it like you would have to replace a fuse.

Answer 4

When an electrical appliance becomes faulty or ground fault exists, and excessive amount of electric current flows and can produce a large amount of heat.

If the excessive electric current is over a certain value the miniature circuit breaker will "TRIP" automatically to break the flow of current in order to protect the electrical appliance - and its service wiring - and to help prevent a home fire.

A miniature circuit breaker is more convenient to use than a fuse because you only need to switch it "OFF" then back to "ON" to reset it, so you don't normally have to replace it like you would have to replace a fuse.

A more technical explanation

Most circuit breakers operate on two principles.

First, current flow through the breaker heats a bi-metallic element. The more current, the more heat generated. at a certain temperature, the bi-metal element bends, tripping the breaker. This detection element catches overloads that are just slightly more than the breaker's rating. It takes anywhere from a few minutes to several tens of minutes to trip in this mode.

The second detection method is magnetic. Current flow through the breaker flows through a small magnetic coil. At a certain threshold, the magnetic field is strong enough to move the trip arm, tripping the breaker. This detection method is almost instantaneous, and is usually set for a very large overload.

Many breakers combine these two methods into one breaker. Others, typically used for large electric motor protection, will use one or the other.

There are also specialized breakers designed to detect fault current to ground, called GFCI (ground fault circuit interruptor) and arc-flash breakers.

Answer 5

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