Table of Contents
How does a short circuit cause a blown fuse?
First, and most commonly, when too many lights or plug-in appliances draw power from the circuit, it can overload the capacity of the fuse and cause the metal ribbon inside the fuse to melt through. A mis-wired lamp, for example, can cause a short circuit and blown fuse if it is plugged into an outlet.
Can a short circuit cause a fire?
Short circuits are a major type of electrical accident that can cause serious damage to your electrical system. The result of a short circuit can be appliance damage, electrical shock, or even a fire.
How does fuse short circuit?
A fuse will restrict fault currents to such low values that a high degree of protection is given to circuit components against even very high short-circuit currents. They permit breakers with lower interrupting ratings to be used.
Why does the fuse keep blowing in my air handler?
The most logical cause of your air conditioner tripping a breaker or blowing a fuse when it comes on stems from a problem with the electrical connection, the power supply, or the circuit that powers the system. Breakers and fuses are designed to trip or blow when too much voltage is sent through the line.
Why is a short circuit bad?
short circuit means high current A short circuit is an electric circuit offering little or no resistance to the flow of electrons. Short circuits are dangerous with high voltage power sources because the high currents encountered can cause large amounts of heat energy to be released.
What happens when you short a fuse?
This causes excessive current flow in the power source by way of the “short” or “fault.” Overloaded wires will overflow and cause damage. A short circuit might even cause the electrical device responsible for it to be destroyed.
Why are there constrictions in the HRC fuse element?
Under high current short circuit conditions the smaller area constricted parts of the fuse element will melt rapidly and vaporize and will break before the Eutectic Material. That is why constrictions are provided in the HRC Fuse element. A Fuse operates when its element melts due to heat produced by I2RF, where RFis Fuse resistance.
What is a high rupturing capacity fuse?
HRC Fuse (High Rupturing Capacity Fuse) and its Types This type of fuse contains a fuse wire in it, which carries the short circuit current safely for a given time period. During this period, if fault is removed, then it does not blow off otherwise it will melt and remove the circuit from electrical supply hence, the circuit remains safe.
What happens when a fuse blows?
When a fuse blows out the tripping device during the fault condition, it will cause the circuit breaker to operate. The body of fuse is made of ceramic material with a metallic cap fixed at each end. They are connected by series of silver fuse elements.
What is the time-current relationship of a fuse?
Therefore, we can conclude that a Fuse element will melt faster for large fault current while it will take some time for lower value of fault current. This time-current relationship of Fuse is known as Characteristics of Fuse and is very useful for proper selection of Fuse for a particular circuit and for coordination purpose.