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Why earth fault current is less than short circuit current?
A short circuit occurs when the current pass through earth directly or the current returns to its source without passing the load. It is caused by a very low or zero impedance wire that may be connected line to line or line to ground.A fault current can be a short circuit but the wire have an impedance that may still give current to the load. the protective device operates when the current exceeds the rating of circuit breaker, by load current + fault current.
What is an over-current protective device?
That is called a fuse. A fuse is a protective device, which will interrupt the flow of electricity if it is subjected to a current that is greater than its rating. Some fuses are designed to handle a large inrush of current and are used in circuits such as air conditioners, where a large amount of current is needed at startup, for a short duration and then current drops to a lower level. These are sometimes called time-lag fuses.
Where circuit breaker are used?
Circuit breakers do not use anything, they are a controlling device. They can automatically open the circuit if the current exceeds the current rating and you can manually disconnect the power from the circuit.
What is the voltage power and current rating of an integrated circuit?
What is the voltage and current of an integrated cicuit
Difference between overcurrent relay and fuse?
Current is flow of electricity charge. Voltage is a measure of potential energy or charge. Fuse. Is a device that opens when the current rating is exceeded this stopping the flow of current.
Is a SCR a voltage rating device or a current rating device?
Check the databook for the SCR you are using. Without knowing the part number, I can't look it up for you.
What is the term for fuse?
THis is the term. Fuse is a current sensing device that is set to open at a predetermined amount. Once current passing thru the device exceeds its rating it opens the circuit to protect the circuitry behind it.
What fuse rating do you need for an 11 amp circuit?
A fuse is designed to "open" if the current exceeds the specifications of what it is protecting. I have never heard of an 11 A circuit. If you are trying to protect a device that has an 11 A rating it needs an 11 A fuse. With a lesser rating the fuse will blow whenever the current exceeds the rating and if you use a higher rating it won't protect the device. Also recognize that fuses have different response times to allow some surge current without blowing. For example a skow blow fuse will allow an over-current for a small amount of time before blowing.
Why earth fault current is less than short circuit current?
A short circuit occurs when the current pass through earth directly or the current returns to its source without passing the load. It is caused by a very low or zero impedance wire that may be connected line to line or line to ground.A fault current can be a short circuit but the wire have an impedance that may still give current to the load. the protective device operates when the current exceeds the rating of circuit breaker, by load current + fault current.
What is an over-current protective device?
That is called a fuse. A fuse is a protective device, which will interrupt the flow of electricity if it is subjected to a current that is greater than its rating. Some fuses are designed to handle a large inrush of current and are used in circuits such as air conditioners, where a large amount of current is needed at startup, for a short duration and then current drops to a lower level. These are sometimes called time-lag fuses.
Where circuit breaker are used?
Circuit breakers do not use anything, they are a controlling device. They can automatically open the circuit if the current exceeds the current rating and you can manually disconnect the power from the circuit.
What could happen if a blown fuse were replaced with one that blew at a much higher current than the original?
The circuit or device that the fuse was meant to protect would not be protected if a fuse with a higher rating were to be used. This could result in the circuit or device being destroyed by a higher than normal current flow in a short circuit fault condition.
What do car fuses do?
A device designed to provide protection for a given circuit or device by physically opening the circuit. Fuses are rated by their amperage and are designed to blow or open when the current being drawn through it exceeds its design rating. They are designed to protect the electrical circuits in your car from a short circuit or overload.
What is the voltage power and current rating of an integrated circuit?
What is the voltage and current of an integrated cicuit
Can all circuit breakers interrupt large fault currents?
All Circuit Breakers have a current rating and a FAULT current rating. The current rating refers to the current at which the circuit breaker is designed to 'break' the circuit and this is generally shown in Amperes (A). FAULT current rating is generally alot higher rating and is therefor shown in kilo Amperes (kA). This kA rating refers to the amount of current which a circuit breaker is designed to handle under fault conditions and can still maintain operation and 'break' contact. Most household circuit breakers are around 7.5 kA, so any fault over 7,500 Amperes could potentially damage the circuit breaker contacts to the point which it can not open the circuit. Larger fault ratings are found in larger applications such as MCC's on plants, minesites or power stations.
Difference between overcurrent relay and fuse?
Current is flow of electricity charge. Voltage is a measure of potential energy or charge. Fuse. Is a device that opens when the current rating is exceeded this stopping the flow of current.
Will a circuit breaker give off less amperage?
A circuit breaker does not give off amperage. A circuit breaker allows a flow of current up to the rating of the breaker. Any current higher than that of the breaker's rating will open the breaker's contacts and stop the flow of current.
