CDM7-Moulded Case Arc-fault circuit interrupter

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An Arc Fault Circuit Interrupter (AFCI) is a specific duplex receptacle or circuit breaker designed to help prevent fires by detecting an unintended electrical arc and disconnecting the power before the arc starts a fire. An AFCI must distinguish between a harmless arc that occurs incidental to normal operation of switches, plugs and brushed motors and an undesirable arc that can occur, for example, in a lamp cord that has a broken conductor in the cord.

Arc faults in a home are one of the leading causes for electrical wiring fires. Each year in the United States, over 40,000 fires are attributed to home electrical wiring. These fires result in over 350 deaths and over 1,400 injuries each year.

Conventional circuit breakers only respond to overloads and short circuits; so they do not protect against arcing conditions that produce erratic, and often reduced current. An AFCI is selective so that normal arcs do not cause it to trip. The AFCI circuitry continuously monitors the current and discriminates between normal and unwanted arcing conditions. Once an unwanted arcing condition is detected, the AFCI opens its internal contacts, thus de-energizing the circuit and reducing the potential for a fire to occur. An AFCI should not trip during normal arcing conditions, which can occur when a switch is opened or a plug is pulled from a receptacle, or a device with a brush-type motor is in operation.

AFCI circuit breakers resemble a GFCI/RCD (Ground-Fault Circuit Interrupt/Residual-Current Device) breaker in that they both have a test button although each has a different function; similarly, AFCI receptacles resemble GFCI receptacles in that they too have a test button. GFCIs and RCDs are designed to protect against electrical shock of a person, while AFCIs (receptacle or breaker) are primarily designed to protect against electrical fires caused by arcing. Some outlets must be protected by both a GFCI and an AFCI, such as an outlet near a wet bar in a family room.

 

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Q:Circuit system diagram and circuit breaker connection
, but in the maintenance can manually disconnect the circuit to ensure that maintenance personnel personal safety
Q:What is the common circuit switch called switch
Manual and electric operation are, with the development of microelectronics technology, the current part of the intelligent circuit breaker with a regional
Q:Home circuit breakers and how much air is open
According to the requirements of customers and decoration personality differences, combined with the actual situation of flexible distribution plan.
Q:Why the high-voltage circuit is equipped with isolation switch and circuit breaker
The circuit breaker has an overload protection function that can operate with current. But the contact is covered by the arc extinguishing device, the break point is not visible.
Q:Which is the circuit switch, that is the circuit breaker
so the frame circuit breaker and molded case circuit breaker applications are different occasions, the framework used in the higher into the line, molded case applied to the lower level of the framework.
Q:Is the circuit breaker in the circuit necessary?
occasionally short-time overcurrent motor can withstand, but the fuse blown, but also affect the production.
Q:Does the isolator and circuit breaker able to switch to each other?
Circuit breaker in normal circumstances, used to close or disconnect the circuit, the failure occurs, under the control of the relay protection device, can automatically disconnect the faulty device or line.
Q:How to distinguish between disconnectors, circuit breakers?
Because it does not have a special arc extinguishing device, can not cut off the load current and short circuit current.
Q:Why the first break circuit breaker, after the isolation switch off it?
can not disconnect the charged circuit, so the disconnector should be used in conjunction with the circuit breaker.
Q:he circuit breaker in the circuit mainly plays a protective element what protects the two functions of the element
he circuit breaker is composed of a thermal element and a current coil, and when the circuit current exceeds the rated value

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