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Common mistakes in the use of circuit breakers
Date:2017-10-09 21:20   Author:admin    Viewed:
 
Choose the right circuit breaker, not only can protect the safety of household appliances, but also to protect you and your family's personal safety, but people are generally on the leakage circuit breaker there are several misunderstandings.
Error 1: to achieve rated current must act
Commentary: the national standard GB10963 stipulates that when the working current of the circuit breaker is 1.13 times of the rated current, it shall not be allowed within 1 hours. When the working current rises to 1.45 times the rated current, it must be operated within 1 hours. Thus, when the operating current is equal to the rated current, the circuit breaker will not act, and the circuit breaker itself allows a slight overload
Error two: short circuit must be action
Common mistakes in the use of circuit breakers
Commentary: the provisions of the national standard GB10963, short circuit current action C circuit breaker is 5 times the rated current to 10 times, most of the manufacturers set at around 7 times, that is to say, the short circuit current action 63A circuit breaker is 63*7=441A, if the short-circuit current is less than 441A, then 63A circuit breaker can not believe the short circuit, the short-circuit protection is not working. The overload protection action is not instantaneous, depending on the current size, it takes a few seconds or even minutes to move, at this time, the wire may have been severely burned and burned. Therefore, the use of different occasions to choose the appropriate number of circuit breakers to protect, but also to match the appropriate cross-sectional area of the wire, so as to ensure that the short circuit when the emergence of reliable action
Error three: up and down the line can be
For most small circuit breakers, on line is indeed possible, but compared to the electronic leakage circuit breaker, if from the lower end into a power, the top load, if the leakage occurs, the coil will be part of the leakage breaker burned, also lost the leakage protection function. Therefore, we must develop the line of progress, the next line of good habits
Error four: leakage circuit breaker when thunder action
Leakage circuit breaker with overload protection, short-circuit protection, leakage protection three functions, but it has no lightning protection function, and the 2008 edition of the GB16917 specified in the leakage circuit breaker to pass EMC test, it is anti interference testing, a surge caused by lightning is in interference. Can choose good lightning protection surge protector special (SPD)
Error five: leakage circuit breaker in the electric shock must act
The working principle of leakage breaker determines that it can only protect the leakage of leakage, if the body has a separate contact line, part of the current through the body to the earth leakage circuit breaker and leakage current detection action appeared to. But if the human body is touching the fire line and the zero line at the same time, the current passes through the human body and flows back into the circuit, and the leakage circuit breaker can not detect the leakage of electricity and refuses to act.
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