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:Leakage circuit breaker is not on, how to do
If you close one of the shunt switch, if the trip or not when the gate, indicating that the road is short circuit or leakage.
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:Home circuit breakers and how much air is open
here are numerous power distribution programs, the following five commonly used configuration features, installation considerations for customer reference.
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 MCB switch a circuit breaker or a component on the circuit breaker?
with leakage protection This function is used in the total switch circuit breaker or used in the branch circuit breaker better, personal understanding of the total circuit breaker
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:The specific function and operation mode of the auxiliary switch on the circuit breaker switch
can be through the auxiliary contact circuit breaker Split position, to achieve automatic control (even jump, BZT, mutual latch, start and stop protection, and so on).
Q:What is the difference between open air and circuit breakers?
The type of protection function and the protection mode are selected by the user according to their needs. Such as short circuit protection, over current protection, exclusion control, undervoltage protection.
Q:Is it possible to switch the lamp directly with a circuit breaker?
Circuit breakers can be used to distribute power, not frequently start the asynchronous motor, the power lines and motors and other protection, when they have a serious overload or short circuit and undervoltage failure can automatically cut off the circuit, its function is equivalent to the fuse switch
Q:How to protect the leakage protector leakage protection?
Capture leakage, electric shock and other ground fault current. Trip and strokes according to its breaking reaction time cut off the power

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