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:Switch switch, disconnector, circuit breaker difference? What are the possible functions of each?
in the maintenance as a clear point, and can not carry sub-gate, or will pull the arc ACCIDENT.
Q:How to switch from the circuit breaker switch button, the difference is short circuit protection or overload protection?
Circuit Breaker Circuit Breaker. Leakage protector leakage protection is the effect of two different products is different. In any case, I seriously bored at home to reply to your question, hope to help you!
Q:Circuit system diagram how the circuit breaker said
Therefore, the disconnector can only be in the circuit has been broken when the circuit breaker to operate, is strictly prohibited with the load operation
Q:How is the circuit breaker different from the air circuit breaker?
Commonly referred to as the main circuit switch, including circuit breakers, load switches, disconnectors, knife melting switch.
Q:Is the isolator switchable with a circuit breaker?
Disconnector: similar to the knife switch, no to prevent overcurrent, short circuit function, no arc device;
Q:How to choose a circuit breaker for home and small office circuits
After installation wiring, press the leakage connector leakage test button, you can create a brief manual leakage to test whether the leakage of electrical action.
Q:Why the first break circuit breaker, after the isolation switch off it?
when the circuit breaker is broken, the circuit has no current, pull the switch will not produce arc, There will be an accident.
Q:Household leakage circuit breakers, circuit problems
Leakage circuit breaker DZ47LEC63, electric problem. Anxious ~ ~ ~ ~ ~ reward points: 80 - from the end of the problem there are 14 days 23 hours 1
Q:What circuit symbols are used for circuit breakers
Residual current protection device (hereinafter referred to as the NLD), which detects the residual current,
Q:What is the role of the circuit breaker?
the circuit breaker internal trip mechanism, there is a different coefficient of expansion when the two kinds of metal bonding bimetallic together,

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