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Word Count: 963
A circuit breaker was examined to determine how it works Basically it is designed to disconnect the current if the current passing through the breaker is higher than the allowable current Its main parts consist of a switch connecting pads and the disconnect device Since the breaker consists of many individual parts the only improvement found was to combine some of the parts into a single part Introduction Our group dissected a thirty-amp household Circuit-breaker Its purpose is to protect electrical appliances from being damaged though excessive currents A circuit breaker limits the amount of current that may safely enter a household electrical system via a predetermined amperage rating It is placed in series between your house and the provided electricity Any current in excess of the rated current amount will trip the circuit breaker in to a non-conducting or open path condition The closed path is maintained until either magnetism or thermal expansion causes the circuit to trip Device Description The circuit breaker has several features that are worth noting in the design discussion First is its ability to detect various types of loading situations The breaker can not only open a circuit in response to a current spike but can also react to a sustained moderate current draw just above its rated current The circuit breaker also has an easily resetable 3-position switch and various internal safety features such as spark arrestors and cavity vents Operation of the circuit breaker is simple but utilizes complex mechanisms Essentially there are to main internal mechanisms the trigger and the switch The trigger is the device that senses the abnormal current load A sharp spike in current will cause a magnetic field to form in the trigger releasing the switch A slightly elevated but more constant current draw through the breaker will cause the bi-metal composition of the trigger mechanism to deflect in an arc like manner which is also capable of releasing the
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