Difference between RCCB and ELCB

ELCB measure the voltage in earth link wire or ground wire to trip whereas RCCB measure sum of currents in neutral and phase to trip. They both are different in function but not in design and speed. Let us have a deep insight into the definition of ELCB and RCCB and the difference between them in this article. 

What is ELCB?

The ELCB stands for, Earth Leakage Circuit Breaker, it is a  basically safety device is used in electrical installations with high earth impedance to prevent shock. It detects small stray voltages on the metal enclosures of electrical equipment and also interrupts the circuit if some dangerous voltage is detected.

What is RCCB?

RCCB stands for Residual Circuit Breaker, It is essentially a current sensing device used to protect a low voltage circuit in case of a fault. It contains some switch device that switches off whenever some fault occurs in the connected circuit. 

Difference between ELCB and RRCB :

  • RCCB is the new name that specifies a current operated new name to distinguish from voltage-operated while ELCB is the old name and often refers to voltage operated devices that they are no longer available and it also advised you replace them if you find one.
  • RCCB stands for residual case circuit breaker while ELCB stands for earth leakage circuit breaker.
  • ELCB is an old technology while RCCB is a new technology.
  • ELCB is connected to phase, natural as well as earth line, RCCB is connected only phase and natural line. 
  • Both are working for the same, but the thing is connectivity is the difference.
  • RCCB does not monitor the system earthing status. It monitors only the live and neutral while in ELCB ensure the system is connected on perfect earth which means ELCB sense the connectivity of earthing.
  • In ELCB cost is high compare to RCCB.
  • ELCB is not recommended over RCCB while in RCCB  is also known as the current operated ELCB.
  • ELCB detect earth faults that flow back through the main earth wire, RCCB will detect any earth faults, that's why they are using mow instead of ELCB.
  • ELCB is working based on earth leakage current while RCCB is not having sensing or connectivity of earth because fundamentally phase current is equal to the neutral current in a single phase.

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Difference Between isolator and circuit breaker

As we know that both isolators and circuit breakers switch to isolate a section of the power system but one point is that the isolator is an offload device while in the circuit breaker in on load device. Let us have a deep insight into what is an isolator and circuit breaker and key difference between them in this article. 

Definition of isolator:

An isolator is just like a switch, only can be operated under offload condition. It mostly used in industry-level applications. It can not protect the circuit under fault conditions. 

Definition of circuit breaker:

A circuit breaker is basically a protecting switch, it can be operated both manually as well as auto, actually. It follows the instruction of protecting devices under various fault conditions such as over current, short circuit, etc.

Difference between isolator and circuit breaker : 

  • The isolator is switch operated manually while the circuit breaker is operated automatically.
  • The isolator is an electronics device made by using MOSFET or BJT while the circuit breaker is a mechanical device that acts as a switch.
  • Isolator has a low withstand capacity as compared to that of the circuit breaker.
  • The isolator is an offload device while the circuit breaker is an on load device.
  • The isolator is meant only for interrupting the power during maintenance or repair while in circuit breaker are meant for protection of a circuit or equipment from short circuit and overload faults while they are in operations.
  • The breaking capacity of isolators is very less compared to the circuit breaker.
  • In isolator protection relay does not require while in circuit breaker protection relay control the breaker.
  • Isolator has a less cost while in circuit breaker has a high cost.
  • In isolator atmospheric air is used as arc quenching medium while in circuit breaker different kinds of a medium are used in typically atmospheric.
  • Isolator has high safety while in circuit breakers need well-trained technicians.
  • Arc quenching medium is used for isolator while in circuit breaker SF6  and vacuum atmospheric air were used.
  • Physical contact status can be seen. since they are necessary during the maintenance process while in the circuit breaker we cannot see the physical condition.
  • Isolator cuts out a portion of a substation when some fault occurred. Some other devices operate without any interruption, but in the circuit breaker know as an automatic circuit breaker which trips the entire system if any fault occurs and thus the whole system is affected.

Difference between fuse and circuit breaker

The difference between the fuse and circuit breaker are explained considering various factor like working principle, reusability, an indication of status, the requirement of the auxiliary, breaking capacity, protection, curves, its function, temperature and mode of operations.

 The most significant difference factor between fuse and circuit breaker is that lies in their operational mechanism. The fuse is a base of thermal as well as electrical characteristics of the conducting metal which is utilized in the fuse while in circuit breaker functions on the base of electromechanical principles. Let we have a deep insight into the benefits and disadvantages of fuse and circuit breaker to better understand this topic.

What is a fuse?


 Fuse is defined as an overall current protective device with a circuit opening fusible element which open when there is an overcurrent in the circuit.

What is the circuit breaker?


 A circuit breaker is a device which controls a circuit automatically manually or by remote control under normal and fault conditions like overcurrent or short circuit etc.

Difference between fuse and circuit breaker :

  • Fuse works on the principle of electrical and thermal properties of the conducting materials whereas the circuit breakers work on the electromagnetism and switching principle.
  • The fuse provides protection against only power overloads whereas a circuit breaker provides protection for both power overload and short circuit.
  • Breaking the capacity of the fuse is low as compared to that of a circuit breaker. 
  • The fuse provides both detection and interruption process. Circuit breaker performs the only interruption, a relay system is attached for detection of any fault in the circuit.
  • No auxiliary contact is required in case of fuse but in circuit breaker, auxiliary contact is required.
  • Operating time of fuse is very less about 0.002 second while operating time of circuit breaker is comparatively more than that of fuse, about 0.02 to 0.05 second.  
  • Fuse cannot be used as an ON/OFF switch while in circuit breaker can be used as an ON/OFF as a switch.
  • Fuse is only single pole version is available while in circuit breaker single and multiple pole version is available.
  • Fuses are independent of ambient temperature but circuit breaker depends on the ambient temperature.
  • The cost of the fuse is low whereas the circuit breaker is more costly.
  • Mode of operation off fuse is completely automatic but circuit breaker can be operated manually it causes nuisance and tripping. The curve of the circuit does not shift.
  • Fuses once used cannot be reused again, the circuit breaker can be reused.
  • Fused used extensively In electronic equipment draw low current while in a circuit breaker are used in power equipment such as in motors and other heavy machines which draw a large amount of current.
  • Fused can be replaced after the operation while a circuit breaker can be reset quickly after the operation.
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Difference between MCB and MCCB

Both MCB and MCCB are circuit breaker so most of people are confused about the difference between them. One of the major difference between MCB and MCCB is that in MCB interrupting rating of under 1800 ampere whereas the MCCB interrupt rating of around 10000-200000 amperes. Before learning the difference between them first you check it out discussion inside to MCB and MCCB. The differences make them application-specific in an electric circuit. 


What is MCB?


An MCB stands for a miniature circuit breaker is an electromechanical device that protects the electrical circuit from overcurrent resulted due to overload, short circuit or anything which causes excessive current flow. The most important advantage of using MCB over fuse is that the power supply can be resumed almost immediately. So that points MCB is better to fuse.

 MCB is classified according to the tripping over the rage of fault current. It is most important for you to know what type of MCB trip curve to decide what type to use for different appliances for the correct electrical system. Before learning about type first understand the trip curve. Trip curve is essentially nothing but the maximum current that particular MCB can withstand. Here there are six different types of MCB, which are A, B, C, D, K, and Z.
  • MCB is a thermal/thermomagnetic device.
  • It provides protection against over current and short circuits.
  • It is available in single, two three and four-pole versions.
  • It commonly used in lighting circuits.
  • Available up to 100A and have a maximum short circuit capacity of 25KA.

What is MCCB?


An MCCB stand for, molded case circuit breaker is a circuit breaker and trip device assembled in a molded case. It also operates in case of overload and short circuit. MCCB is commonly used for industrial applications for high power equipment.
  • It may be a thermal/thermo-magnetic/Electronic trip type.
  • It primarily provides protection against the current and short circuit.
  • It can provide protection against mainly on residual currents and under voltages.
  • Available up to the rating of 2500A.
  • Remote ON/OFF is possible with some additional accessories.
  • Some MCCBs are microcontroller based.
  • Available in a single. two, three and four-pole versions.

Difference between MCB and MCCB :

  • MCB stands for Miniature Circuit Breaker while MCCB stands for Molded Case Circuit Breaker.
  • MCCB and MCCB both are the thermomagnetic devices and they are classified under low voltages breaker.
  • The size of the MCB is small but the size of the MCCB is big.
  • Both are low voltage circuit breakers created to meet IEC( International electrotechnical commission) 947 standards.
  • MCB is a type of switch which protects the system from overload current whereas the MCCB protects the system from over-temperature and short circuit current.
  • MCB is a tripping circuit of the MCB is fixed while in MCCB is movable.
  • MCB is rated current not more than 125 Ampere, MCCB current rated up to 1600 A.
  • Interrupting current in MCB  under 10KA while In MCCB interrupting current range from around 10KA-85KA.
  • MCB has a single, two or three pole version whereas the MCCB has a single, two, three or four-pole version.
  • MCB is mainly used in a low current circuit while MCCB is mainly used in for the heavy current circuit.
  • The cost of the MCB is low but the cost of MCCB is high.
  • MCB is used for home application, domestic purposes while MCCB is used in large industrial or commercial applications.
  • The remote ON/OFF is not possible in MCB but MCCB  is possible by the use of shunt wire.
  • A circuit breaker is installed for safety reasons.
  • Some of the MCCB units are specially made to respond to remote control signals, usually as standby power.
  • MCCB has a higher capacity than an MCB, both are classified under low voltage circuit breakers.
  • Both of the MCB and MCCB are highly durable and can last for years depending on the manufacturer.
  • Morden MCCBS has alarm system but there is no alarm system in MCB.

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Basic Electricity MCQ

1. The draft velocity of electrons is
A. Larger then the speed of light
B. Almost equal to the speed of light
C. Equal to the speed of light
D. Very small in comparison to the speed of light 

2. Ohm’s law applicable to
A. Temperature is reduced
B. Temperature is increased
C. Number of free electrons available become less
D. Number of free electrons available become more

3. A network having one or more than one source of emf is called
A. Passive network
B. Active network
C. Linear network
D. Non-linear network

4. Energy Meter for connection has
A. 2 terminals
B. 4 terminals
C. 6 terminals
D. 8 terminals

5. Kirchhoff’s laws are not applicable to circuit with
A. Distributed parameters
B. Lumped parameters
C. Passive elements
D. Non-linear resistance

6. Kirchhoff’s  current law is applicable only to
A. Electric circuits
B. Electronics circuits
C. Junction in a network
D. Closed-loop in a network

7. The fuse rating is always expressed in
A. Volts
B. Amperes
C. Ampere-volts
D. Ampere hours

8. An electric battery is a device that
A. Generate the emf by chemical action
B. Convert the heat energy into electrical energy
C. Convert mechanical energy into electrical energy
D. Convert fuel energy into electrical

9. Cell are connected in parallel in order to increase the
A. Life of the cell
B. Efficiency
C. Current capacity
D. Voltage rating

10. Cell are connected in series in order to increase the
A. Life of the cell
B. Terminal voltage
C. Current capacity
D. Voltage rating

11. In Fleming’s left-hand rule thumb always represents direction of
A. Current flow
B. Magnetic field
C. Mechanical force
D. Induced EMF

12. The capacity of a lead-acid battery does not depend upon
A. Charge rate
B. Discharge rate
C. Temperature
D. Density of electrolyte

13. In Fleming’s left-hand rule thumb always represents direction of
A. Remains constant
B. Varies
C. Decreases
D. Increases

14. Lamps in street lighting are all connected in
A. Series
B. Parallel
C. Series-parallel
D. End-to-end

15. Which of the following statements associated with inductors is wrong?
A. An inductor is a sort of short circuit to DC
B. An inductor is a sort of the open circuit to DC
C. An inductor never dissipates energy but only store it
D. A finite amount of energy can be stored in inductors even if voltages across it is zero,
  such as when the current through it is constant.


Advantages and disadvantages of MCCB

MCCBs stands for molded case circuit breaker, it is used to control electric energy in distribution n/k and is having short circuit and overload protection. MCCB  is a circuit breaker that is an electromechanical device that guards a circuit from a short circuit and over current.

The main primary function of MCCBs is to give a mean to manually open circuit, automatically open circuit under short circuit or overload conditions. In an electrical circuit, the overcurrent may result in faulty design.  Let us have a deep insight into the advantages of the molded case circuit breaker, to know more about it. 

Advantages of MCCB:

  • MCCB has a prevent the electrical device from faulty situation.
  • The maintenance cost fee is free and recurring costs are less.
  • This device is compact in the measure. hence saves wide space in the panel design.
  • MCCB can clear several faults before it is due for replacement.
  • In this circuit breaker, some multi-purpose accessories can be fitted with the MCCB.
  • When we have to use MCCBs, there is no possibility of single phasing due to fault in only one phase.
  • MCCB takes less time to reset and to switch on while it trips down during the faults.
  • Along with MCCBs, there are certain accessories that can be fitted and few also act as multi-purpose usage.
  • Some multi-reason adornments can be fitted with the MCCB.
  • MCCBs have to limit downtime. Unlike in a fuse based system, there is no searching for a replacement fuse. It is very well may be reset and switched on again instantly in the wake of finding the blame that caused the stumbling amid activity.
  • MCCBs can clear a few blame previously it is expected for substitution.
  • MCCBs are used for electrical feeder protection against overcurrent, earth fault and under voltage.

When you have bought online following some point to benefits which leads you in making the right decision for shopping of MCCBs:

  • Time-saving.
  • 24/7 order placement.
  • Technical specification and consultations online.
  • Exclusive offers, discounts, and better prices.
  • Easy step process to place an order.
  • Wide variety of branded products, listed in the catalog.
A molded case circuit breaker is a fundamental component of electrical protection for high current applications. Adequate size and maintenance of MCCB are key elements in order to guarantee safe and also reliable in the long term.
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LM7805 pinout | Introduction | Feature | Diagram | Application

Introduction about IC LM7805 :


In this page, we will discuss one of the most commonly used regulators IC's, the 7805 voltage regulator IC. AS we know that a regulated power supply is very much essential for several electronic devices due to the semiconductor materials employed them have a fixed rate of current as well as voltage. 

One of the most important sources of dc supply is batteries, but while using batteries, it is very sensitive electronics circuit is not a good idea as batteries eventually drain out ad lose their potential over time. 

7805 is a three-terminal linear voltage regulator IC with a fixed output voltage of 5V which is useful in a wide range of applications. Currently, the 7805, voltage regulator IC is a manufactured by many companies like texas instrument, ON semiconductor, ST microelectronics, diodes incorporated, Infineon technologies, etc

LM7805 pinout diagram :


LM7805 is shown in the figure has a three-terminal device with the three pins being Input, Ground, and Output.

Input: Pin 1 is the input pin. A positive unregulated voltage is given as the input to this pin.

Ground: Pin 2 is the ground pin. It is common to both input and output.

Output: Pin 3 is the output pin. The output regulated 5V is taken at this pin of the IC.
LM7805 Pinout

7805 Regulator Features : 

  • 5V positive voltage regulator. 
  • Operating current is 5MA.
  • Minimum input voltage is 7V.
  • Maximum input voltage is 25V.
  • 5Ω load resistor.
  • Required very minimum external component to fully function.
  • Available in TO-220 and KTE package.
  • It can deliver up to 1.5A of current. 
  • Internal thermal overload and short circuit current limiting protection is available.
  • Junction temperature maximum of 125-degree celsius. 
  • This IC has both internal current limiting and thermal shutdown features. 

Application of LM7805 : 

  • It can be used regulated dual supply. 
  • The constant +5V output regulator microcontrollers and sensors in most of the projects. 
  • It is used in a wide range of circuits. 
  • It is used as a fixed output regulator. 
  • It can be used current limiter for certain applications. 
  • This IC can be used regulated DC voltage regulator. 
  • The output polarity reversal protection circuit. 
  • Reverse bias protection circuit. 
  • Used as a positive regulator in negative configurations. 
  • Used in the current regulator. 
  • LM7805 IC can be used as an adjustable output regulator.

Conclusion : 

  • The most important point is that the input voltage should always be greater than the output voltage. 
  • The input current and the output current are almost identical means that when a 7.5V, 1A supply is given at input the output will be 5V, 1A. 
  • The remaining power is dissipated as heat and hence a heat sink like the one shown below must be used with LM7805 IC. 

Advantages and disadvantages of MCB

MCB stands for miniature circuit breaker, it is an electromechanical device which protects an electrical circuit from short circuit, faulty design, and overload which may lead to overcurrent. MCB is a better alternative to a fuse as it has more advantages over the later one. The disadvantages of fuses are that when they have operated they must be replaced. An MCB has overcome this problem since it is an automatic switch which opens in the event of an excessive current flow circuit in the circuit and can be closed when the circuit returns to normal.  Let us have a deep insight into the pros and cons of the Miniature circuit breaker to know more about it. 

Advantages of MCBs:

  • MCBs have more sensitive to current then fuse. 
  • It has quick work against short circuits.
  • It works quickly on overloading and under voltage.
  • It is reusable hence less maintenance cost and less replacement cost.
  • It is very simple to resume the supply.
  • It can be easily used circuit control switch when needed.
  • Handling MCB is electricity safer than handling fuse, in case of MCB.
  • It has reliable.
  • MCB provides a better interface.
  • MCB performance immediate indication of faculty circuit.
  • The performance of MCB is good in case of earth leakage.
  • In the case of surge current, The MCB has time delay characteristics, therefore, it works properly.
  • Shorter tripping time under moderate over current than with fuses.
  • When the use of MCB, the faulty zone of the electrical circuit can be easily identified.

Disadvantages of MCBs:

  • The cost of the MCB is greater than the fuse.
  • The cost of the MCB distribution board is greater than the rewireable fuse board.
  • The risk of overloading of the circuit due to unqualified of the person operating than completing removed.

PCB advantages and disadvantages

The PCB stands for the printed circuit board. This board is a very vital part of modern electronic equipment. Printed circuit board consists of a very large number of passive as well as active components required. The components are connected from side to side with traces on the board. It is absolutely to develop very large circuits on small printed circuit boards with the availability of very small-sized electronic components. Let us have a deep insight into the advantages and disadvantages of the printed circuit board to know more about it. 

Advantages of PCB :

  • PCBs has a low cost, mass production can be achieved at a lower cost.
  • It is Re-workable.
  • Widely available.
  • Excellent shelf life
  • This board gives low electronics noise.
  • Compact size and saving of wire.
  • Inspection time is reduced because PCBs eliminates the probability of error.
  • This board takes less time in assembling a circuit as compared to the conventional method.
  • In this design, there is no chance of loose connections or short circuit.
  • If in case of any damage, it is very easy to check and replace the particular failure components.
  • Printed circuit board design to offer uniformity of electrical characteristics from assembly to assembly.
  • The location of the electronic part is fixed and it is easy to simplify components identification and maintenance of equipment.
  • Component wiring and assembly both can be mechanized in a circuit board manufacturing facility.
  • All of the above factors bring reliability in the performance of the circuit.

Disadvantages of PCB :

  • Uneven PCB surfaces finish.
  • Not good for fine-pitch.
  • It contains lead.
  • Thermal shock.
  • Solder bridging.
  • Not easy to repair once damaged.
  • It can be used for a specific circuit.
  • We cannot be updated, once printed.
  • Plugged or reduced.
  • Redesigning is required for one type of circuit operation.
  • The etching process generates chemicals which are a harmful effect on the environment.
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