RCCB: Residual Current Circuit Breaker
As the name suggest, the basic Principle of this circuit breaker is to operate on Residual current.
How does it work? RCCB is designed to detect current difference between Phase (Live) and Neutral. This current also known as Residual Current. As in normal operating condition, Phase and Neutral will always have a balance current, however, when there is a fault or potential hazard residual current will occur.
For healthy circuit, always amount of current flows through Phase should return through Neutral. If there is any mismatch it will be detected by RCCB.
In other words, RCCB will operate when there is earth fault. RCCB is very useful device to protect individual from electric Shock.
RCCBs will detect current as low as 30mA, which is very small to detect by other means of device. However RCCB are always used in conjunction with other protective device like MCB. As RCCB are only designed to detect residual current and not to trip on overload/short circuit. RCCB are shown for rated current, however, that rating is only indicating normal operation current that RCCB can carry.
The most widely used RCCB are 30mA and 100 mA
How does it work? RCCB is designed to detect current difference between Phase (Live) and Neutral. This current also known as Residual Current. As in normal operating condition, Phase and Neutral will always have a balance current, however, when there is a fault or potential hazard residual current will occur.
For healthy circuit, always amount of current flows through Phase should return through Neutral. If there is any mismatch it will be detected by RCCB.
In other words, RCCB will operate when there is earth fault. RCCB is very useful device to protect individual from electric Shock.
RCCBs will detect current as low as 30mA, which is very small to detect by other means of device. However RCCB are always used in conjunction with other protective device like MCB. As RCCB are only designed to detect residual current and not to trip on overload/short circuit. RCCB are shown for rated current, however, that rating is only indicating normal operation current that RCCB can carry.
The most widely used RCCB are 30mA and 100 mA
ELCB (Earth Leakage Circuit Breaker)
ELCB are mainly two types: 1) Current Operated and 2) Voltage Operated ELCB [VOELCB]
Current operated ELCB are as same as RCCBs or we can say the term current operated ELCB was old and new term is RCCB.
Voltage operated ELCB (VOELCB): In VOELCB there will be 3 connection unlike RCCB. Phase, Neutral and Earth wires are connected through ELCB. VOELCB will monitor any current flow in to the Earth conductor by detecting voltage difference between earth and neutral conductor.
VOELCB may not operate correctly if the earth is connected by supplemental bonding or the fault current from protected circuit is to different earth (than the earth connected to VOELCB).
Range of ELCBs are generally 30mA
Current operated ELCB are as same as RCCBs or we can say the term current operated ELCB was old and new term is RCCB.
Voltage operated ELCB (VOELCB): In VOELCB there will be 3 connection unlike RCCB. Phase, Neutral and Earth wires are connected through ELCB. VOELCB will monitor any current flow in to the Earth conductor by detecting voltage difference between earth and neutral conductor.
VOELCB may not operate correctly if the earth is connected by supplemental bonding or the fault current from protected circuit is to different earth (than the earth connected to VOELCB).
Range of ELCBs are generally 30mA
RCBO (Residual Current Breaker with Overload)
As the name suggest the operating fundamental of RCBO is to operate on residual as well as overload current. RCBO is combination of MCB and ELCB (RCCB).
When current imbalance occur, the residual current circuit (RCCB) will operate and when there is overload in circuit, the circuit breaker (MCB) will operate.
When current imbalance occur, the residual current circuit (RCCB) will operate and when there is overload in circuit, the circuit breaker (MCB) will operate.
RCD (Residual Current Device)
Generally RCD are being used for RCCB. However, RCD is a generic term referring to any kind of device that automatically disconnect circuit when residual current exceeds the specified limit.
The term RCD tends to refer to power socket level implementation of RCD. It can be built in feature or external connected between socket and appliance.
As RCD are generally designed to operate on residual current only and not on overload, RCDs are termed more closely with RCCB and not with RCBO.
RCD (socket built in) is very common in UK and other British standard systems. RCD are rated for maximum current of the socket defined for particular country. In UK it would be 26A for double socket and 13A for single socket or plug in unit or for an extension.
There are two types of RCD. 1) Latching type 2) Non-latching type.
Latching type RCD: This RCD will be latched once power supplier failed and will be reset automatically as soon as power supply restored.
Non-Latching type RCD: This RCD will be non-latched (trip out) once power supplier failed and will be needed manually reset.
The term RCD tends to refer to power socket level implementation of RCD. It can be built in feature or external connected between socket and appliance.
As RCD are generally designed to operate on residual current only and not on overload, RCDs are termed more closely with RCCB and not with RCBO.
RCD (socket built in) is very common in UK and other British standard systems. RCD are rated for maximum current of the socket defined for particular country. In UK it would be 26A for double socket and 13A for single socket or plug in unit or for an extension.
There are two types of RCD. 1) Latching type 2) Non-latching type.
Latching type RCD: This RCD will be latched once power supplier failed and will be reset automatically as soon as power supply restored.
Non-Latching type RCD: This RCD will be non-latched (trip out) once power supplier failed and will be needed manually reset.
RCD Socket
MCB (Miniature Circuit Breaker)
MCBs are designed to operate on overload currents and they can be used as protection device for individual circuit. MCBs can also provide magnetic fault protection and short circuit protection.
Generally 6kA or 10kA short circuit capacity of MCBs are used.
Generally 6kA or 10kA short circuit capacity of MCBs are used.
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