The circuit breaker at the normal condition, uses for close or open a circuit, When the urgent thing happed, under the relay protection installment control, can automatically breakdown the malfunction equipment or separation the circuit.
When circuit breaker separation the electric circuit. Its internal's contact will produce the electric arc in the separation instantaneously. The voltage is higher or the electric current is bigger, the electric arc will be stronger. Because of the circuit breaker interior has the arc extinguishing organization, the circuit breaker can extinguish the electric arc in a short time (for example 0% several seconds), causes the circuit breaker contact to separate safely.
The disconnecting switch 's leading role is the air insulation gap which the form may be able to see, when the equipment logical or circuit overhauls isolates reliably the electric circuit, thus guarantee security. Moreover, It also can use the isolator to change the movement wiring way. Therefore, the isolator is the essential equipment in the electric circuit.
The circuit breaker has the very strong arc extinguishing function and each kind of protection function, may shut off under the belt load; The disconnecting switch does not have the arc extinguishing function, only may shut off in the small load situation.
The circuit breaker may have the load operation, the disconnecting switch could not. But it to have the obvious cut-off point is overhauls and so on dash time isolation functions again.
The circuit breaker may separate the electric current, but did not look that the obvious cut-off point, the disconnecting switch may the release voltage, and forms the obvious cut-off point.
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