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ELCB & RCCB

Created by: @nkur at: 5/23/2014 7:11 PM (12 Replies)

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5/23/2014 7:11 PM
@nkur Posts: 202 Rating: (16)	Dear ALL Can anu tell me the difference between the ELCB & the RCCB?what their part Number series?? what is their range??And the selection procedure...
@nkur Posts: 202 Rating: (16)
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5/24/2014 6:31 AM
jeet2907 Posts: 235 Rating: (52)	@nkur Dear ALL Can anu tell me the difference between the ELCB & the RCCB?what their part Number series?? what is their range??And the selection procedure... Dear find link here
jeet2907 Posts: 235 Rating: (52)
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5/24/2014 6:47 AM	Rate (0)
SMHZ Bronze Member Joined: 10/19/2012 Last visit: 4/17/2022 Posts: 315 Rating: (9)	An ELCB ((earth leakage circuit breaker) and an RCCB (residual current circuit breaker) both have similar purposes, in that they are intended to trip when the current is not confined to the current carrying conductors. Another name used is current balance circuit breaker. These are all used with grounded power supplies. The original use was for larger motors and generators/transformers, where the insulation can fail, and the voltage on the frame of the machine can rise dangerously above ground due to the ground resistance and fault current. An ELCB had a current sensing coil in series with the ground cable, so the supply would be tripped if current occurred in the ground lead. This was often combined with a voltage sensing coil on the frame also, which used a separated ground some distance away. The RCCB senses the balance of the go and return current in the current carrying conductors, and trips the supply if the current is different. The current in the supply cables is different because some is returning via ground. The main purpose is to provide additional protection against electric shock when someone touches an active conductor. These devices trip with only a few milliamps of current imbalance and within a specified time period, so that in theory the supply is removed before someone contacting active wires can receive a dangerous shock. These terms have become more or less interchangeable now, in the domestic situation at least, though it could be that a true ELCB is obsolete except for specialised situations. How they work and a drawing? The earlier designs used magnetic components, though modern devices may be magnetic (a specialised relay) or electronic. If you search for "How it works RCCD" you should find some simplified diagrams of the magnetic types. The electronic type may use a transformer with a current winding for go and a current winding for return, so the two currents cancel. A third winding detects the voltage produced when they are not balanced. There is no point making your own, as the testing and certification is rigorous if you are required to have them by regulations. Source:https://answers.yahoo.com/question/index?qid=20090824025155AAjDpUF

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This contribution was helpful to 2 thankful Users @nkur Chetan2490

5/24/2014 9:11 AM
Chetan2490 Advanced Member Joined: 5/12/2014 Last visit: 9/9/2020 Posts: 149 Rating: (16)	@nkur Dear ALL Can anu tell me the difference between the ELCB & the RCCB?what their part Number series?? what is their range??And the selection procedure... Dear Ankur, Here is thelink

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5/24/2014 10:23 AM	Rate (0)
Madhava Silver Member Joined: 11/26/2011 Last visit: 6/29/2023 Posts: 508 Rating: (23)	Difference between ELCB and RCCB ELCB is the old name and often refers to voltage operated devices that are no longer available and it is advised you replace them if you find one. RCCB or RCD is the new name that specifies current operated (hence the new name to distinguish from voltage operated). The new RCCB is best because it will detect any earth fault. The voltage type only detects earth faults that flow back through the main earth wire so this is why they stopped being used. The easy way to tell an old voltage operated trip is to look for the main earth wire connected through it. RCCB will only have the line and neutral connections. ELCB is working based on Earth leakage current. But RCCB is not having sensing or connectivity of Earth, because fundamentally Phase current is equal to the neutral current in single phase. That’s why RCCB can trip when the both currents are deferent and it withstand up to both the currents are same. Both the neutral and phase currents are different that means current is flowing through the Earth. Finally both are working for same, but the thing is connectivity is difference. RCD does not necessarily require an earth connection itself (it monitors only the live and neutral).In addition it detects current flows to earth even in equipment without an earth of its own. This means that an RCD will continue to give shock protection in equipment that has a faulty earth. It is these properties that have made the RCD more popular than its rivals. For example, earth-leakage circuit breakers (ELCBs) were widely used about ten years ago. These devices measured the voltage on the earth conductor; if this voltage was not zero this indicated a current leakage to earth. The problem is that ELCBs need a sound earth connection, as does the equipment it protects. As a result, the use of ELCBs is no longer recommended. Please go through this post..Link -->

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5/24/2014 10:56 AM	Rate (0)
Hetvi Posts: 10 Rating: (6)	@nkur Dear ALL Can anu tell me the difference between the ELCB & the RCCB?what their part Number series?? what is their range??And the selection procedure... Dear Ankur, ELCB is a device that is used to detect a leaking current from an installation when the power is cut while RCCB is an electric device that disconnects the power when the flow of power is not balanced at phase.
Hetvi Posts: 10 Rating: (6)
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5/25/2014 6:39 PM
@nkur Posts: 202 Rating: (16)	[quote user="SMHZ"]An ELCB ((earth leakage circuit breaker) and an RCCB (residual current circuit breaker) both have similar purposes, in that they are intended to trip when the current is not confined to the current carrying conductors. Another name used is current balance circuit breaker. These are all used with grounded power supplies. The original use was for larger motors and generators/transformers, where the insulation can fail, and the voltage on the frame of the machine can rise dangerously above ground due to the ground resistance and fault current. An ELCB had a current sensing coil in series with the ground cable, so the supply would be tripped if current occurred in the ground lead. This was often combined with a voltage sensing coil on the frame also, which used a separated ground some distance away. The RCCB senses the balance of the go and return current in the current carrying conductors, and trips the supply if the current is different. The current in the supply cables is different because some is returning via ground. The main purpose is to provide additional protection against electric shock when someone touches an active conductor. These devices trip with only a few milliamps of current imbalance and within a specified time period, so that in theory the supply is removed before someone contacting active wires can receive a dangerous shock. These terms have become more or less interchangeable now, in the domestic situation at least, though it could be that a true ELCB is obsolete except for specialised situations. How they work and a drawing? The earlier designs used magnetic components, though modern devices may be magnetic (a specialised relay) or electronic. If you search for "How it works RCCD" you should find some simplified diagrams of the magnetic types. The electronic type may use a transformer with a current winding for go and a current winding for return, so the two currents cancel. A third winding detects the voltage produced when they are not balanced. There is no point making your own, as the testing and certification is rigorous if you are required to have them by regulations. Source:https://answers.yahoo.com/question/index?qid=20090824025155AAjDpUF hi there thanx for the info but what the part No n selection procedure???
@nkur Posts: 202 Rating: (16)
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5/25/2014 8:07 PM	Rate (0)
SMHZ Bronze Member Joined: 10/19/2012 Last visit: 4/17/2022 Posts: 315 Rating: (9)	Siemens had 5SM series which is being replaced by 5SV

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5/26/2014 6:17 AM
jeet2907 Posts: 235 Rating: (52)	@nkur SMHZ An ELCB ((earth leakage circuit breaker) and an RCCB (residual current circuit breaker) both have similar purposes, in that they are intended to trip when the current is not confined to the current carrying conductors. Another name used is current balance circuit breaker. These are all used with grounded power supplies. The original use was for larger motors and generators/transformers, where the insulation can fail, and the voltage on the frame of the machine can rise dangerously above ground due to the ground resistance and fault current. An ELCB had a current sensing coil in series with the ground cable, so the supply would be tripped if current occurred in the ground lead. This was often combined with a voltage sensing coil on the frame also, which used a separated ground some distance away. The RCCB senses the balance of the go and return current in the current carrying conductors, and trips the supply if the current is different. The current in the supply cables is different because some is returning via ground. The main purpose is to provide additional protection against electric shock when someone touches an active conductor. These devices trip with only a few milliamps of current imbalance and within a specified time period, so that in theory the supply is removed before someone contacting active wires can receive a dangerous shock. These terms have become more or less interchangeable now, in the domestic situation at least, though it could be that a true ELCB is obsolete except for specialised situations. How they work and a drawing? The earlier designs used magnetic components, though modern devices may be magnetic (a specialised relay) or electronic. If you search for "How it works RCCD" you should find some simplified diagrams of the magnetic types. The electronic type may use a transformer with a current winding for go and a current winding for return, so the two currents cancel. A third winding detects the voltage produced when they are not balanced. There is no point making your own, as the testing and certification is rigorous if you are required to have them by regulations. Source:https://answers.yahoo.com/question/index?qid=20090824025155AAjDpUF hi there thanx for the info but what the part No n selection procedure??? Dear @nkur Please follow this link to selection of RCCB. Hope this will helpful to you
jeet2907 Posts: 235 Rating: (52)
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5/26/2014 6:53 AM
Chetan2490 Advanced Member Joined: 5/12/2014 Last visit: 9/9/2020 Posts: 149 Rating: (16)	@nkur SMHZ An ELCB ((earth leakage circuit breaker) and an RCCB (residual current circuit breaker) both have similar purposes, in that they are intended to trip when the current is not confined to the current carrying conductors. Another name used is current balance circuit breaker. These are all used with grounded power supplies. The original use was for larger motors and generators/transformers, where the insulation can fail, and the voltage on the frame of the machine can rise dangerously above ground due to the ground resistance and fault current. An ELCB had a current sensing coil in series with the ground cable, so the supply would be tripped if current occurred in the ground lead. This was often combined with a voltage sensing coil on the frame also, which used a separated ground some distance away. The RCCB senses the balance of the go and return current in the current carrying conductors, and trips the supply if the current is different. The current in the supply cables is different because some is returning via ground. The main purpose is to provide additional protection against electric shock when someone touches an active conductor. These devices trip with only a few milliamps of current imbalance and within a specified time period, so that in theory the supply is removed before someone contacting active wires can receive a dangerous shock. These terms have become more or less interchangeable now, in the domestic situation at least, though it could be that a true ELCB is obsolete except for specialised situations. How they work and a drawing? The earlier designs used magnetic components, though modern devices may be magnetic (a specialised relay) or electronic. If you search for "How it works RCCD" you should find some simplified diagrams of the magnetic types. The electronic type may use a transformer with a current winding for go and a current winding for return, so the two currents cancel. A third winding detects the voltage produced when they are not balanced. There is no point making your own, as the testing and certification is rigorous if you are required to have them by regulations. Source:https://answers.yahoo.com/question/index?qid=20090824025155AAjDpUF hi there thanx for the info but what the part No n selection procedure??? Hello Ankur, Please find the attached pdf for the part no. selection Attachment LV10-1_2011_4_Residual Current Protective Devices.pdf (1004 Downloads)

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