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What is Residual current circuit breaker ( RCCB )?

Thisdeviceis very important inelectricalwiring.It is alifeguarddeviceto protect fromelectric

shock.Otherscircuit breakeronly can detect the fault from overcurrentand shortcircuitbut cannot

detect thecurrentleakage.

That whyRCCBis very important.Only thisdevicecan detect

thecurrentleakage.Thecurrentleakage can cause theinjuryor dead for human and can lead to

firehazard.When design the distribution panel board,please make sure this device include in our

planning to install..it for consumersafetyand avoid equipment fromdamage.

The main purpose forRCCBis a provideprotectionagainst direct and indirectcontactof personnel

or livestock and probable fire.Prevents shocks caused byearthleakage which could be fatal.

Principle of operation

HowRCCBcan detect thecurrentleakage?Ok..it use the simpletheoryof balance current through

the currenttransformer.The residual current device monitor the different between the load flowing

through the currenttransformerand ensure the value ofampereis approximately zero.

If current leakage happen,the current flow will not in zero value,the different value exceed the rccb

current rating,it can make the current transformer energized and send the signal to the plunger to cut

off thebreaker.The important thing to ensure this device operate properly,theearthingcable must

be installed in electrical wiring.If not,RCCB cannot detect the current leakage cause the current

is floatingincircuit.

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Protection against electric shock

1) protection in the case of indirect touch (indirect protection of persons) andfault protectionwhen

disconnecting impermissibly high touch voltages caused by short-circuit to exposed conductive

parts.

2) protection in the case of direct touch (direct protection of persons) disconnection as additional

protection where live conductors are touched directly.Hazardousshockcurrents are disconnected

within no time if the rated residual current of the device is In 30 mA.

3) protection against electrically ignited fire (fire protection) if the rated residual current of the

device is In 300 mA

General Description Of RCCB

o To open a circuit automatically in the event of an earth leakage between phase and earth and/orneutral and earth. With effective protection against human contact to earth points.

o Protection against Direct Contact of persons or livestock with live part.o Protection against Indirect Contact of persons or livestock with exposed conductive parts which

have become live under fault conditions.

o Protection against Electrical Fires caused by highresistancefault arching but not causing the overcurrent protection device to operate.

o Designed with surge current withstand capability to prevent nuisance tripping during thunderstorms.Conditionally surge current proof (250A, 8/20us), without time delayed tripping.

o These devices are sometimes called an ELCB or RCD.o Use in domestic, commercial and industrial installations.

RCCB Sensitivity

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1) 30mA ( miliampere)

o Tripping current designed for additional protection against direct contact, or where specially requiredby wiring regulations, the 30 mA RCCB protects against leakage currents and indirect contact with

earthloopimpedance up to 1667 Ohms; for use as additional protection against direct contact,

residual tripping current must not exceed 30 mA.

2) 100mA ( miliampere)

o Tripping current is suitable for protection against indirect contact and leakage currents for largerinstallations; the 100 mA RCCBs operate within 30 ms, but do not provide the same level of

personal protection as the 30 mA units; the 100 mA RCCB protects against leakage currents and

indirect contact with earth loop impedance up to 500 ohms.

3) 300mA ( miliampere)

o A less sensitive protection suitable for large installations having high levels of leakage current; 300mA RCCBs protect against leakage current and indirect contact up to 167 ohms earth loop

impedance.

RCCB possible application area

1) For universal use in normal circuits

2) For additional protection of socket outlet circuits

3) To achieve a high degree of service security

4) For commercial and industrial power installations

RCCB wiring technique

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