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    • Power
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    • AC Basics
      • AC Basics
      • Real Power
      • Reactive Power
      • Complex and apparent Power
  • Circuit Theory
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    • Faraday’s law
    • Lenz’s law
    • Ohm’s Law
    • Kirchoff’s Laws
    • Voltage Division
    • Current Division
    • Thevenin’s Theorem
    • Norton’s Theorem
    • Maximum Power transfer theorem
    • Superposition theorem
  • Machines
    • Transformers
      • Transformer Action
      • Ideal Transformer
      • EMF equation
      • Equivalent circuit and Phasor diagram
      • Voltage regulation
      • Parts of a transformer
      • Transformer tresting
      • Load losses and No-load losses
      • Types
        • Core type and shell type transformers
      • Magnetization current
      • Magnetization inrush
      • High Leg delta connection
      • Buchholz relay
      • Autotransformer
      • Selection
        • Frequently asked questions-1
        • Frequently asked questions-2
        • Frequently asked questions-3
      • Transformer noise
      • Transformer kVA calculator
      • Transformer turns ratio
  • Power system
  • Switchgears
  • Q&A
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Difference between MCB, MCCB, RCCB, RCBO and Isolator

Introduction Circuit breakers are safety devices, which ensures the safety of equipment and personnel from electric shocks and damages. They are self-acting and should safely interrupt the current flow on…

Continue ReadingDifference between MCB, MCCB, RCCB, RCBO and Isolator

Difference between circuit breaker and isolator

Isolator/ Disconnectors Isolator or disconnectors, as the name indicates, is a switching or isolation device, intended to disconnect equipment or electrical Circuit from the supply. It is an offload device,…

Continue ReadingDifference between circuit breaker and isolator

MCB Trip Curves – B, C, D, K and Z trip curves

MCB (Miniature circuit breaker) is a re-settable device designed to protect a circuit from short circuits and overcurrents. The trip curve of an MCB's (B, C, D, K and Z…

Continue ReadingMCB Trip Curves – B, C, D, K and Z trip curves

Difference between MCB and RCBO

MCB – Miniature Circuit Breaker and RCBO – Residual Current Circuit Breaker with Overload Protection are circuit protection devices. These devices are commonly used in low voltage power distribution and…

Continue ReadingDifference between MCB and RCBO

Buchholz relay – Working Principle, Construction and Operation

In large oil-immersed transformers, we can find a cylindrical object installed in the pipe connecting the conservator to the main tank. This cylindrical object, that looks like a solenoid valve…

Continue ReadingBuchholz relay – Working Principle, Construction and Operation

Selection of contactor and overload relay for DOL starter

The below article can guide you through the selection of contactor and overload relay for a three-phase DOL starter and how to optimally size a DOL starter. Data required for…

Continue ReadingSelection of contactor and overload relay for DOL starter

Types and comparison of induction motor starters

As the name indicates, starters are used to start or stop a motor. It consists of an electromechanical switch and protection devices (overload and/or short-circuit protection). Why should we need…

Continue ReadingTypes and comparison of induction motor starters

Contactor – Construction, Operation, Application and Selection

An electrical contactor is a switching device, widely used for the switching of motors, capacitors (for power factor correction) and lights. As the name indicates it is used to make…

Continue ReadingContactor – Construction, Operation, Application and Selection

Difference between MPCB and MCCB

Motor Protection Circuit Breakers and Moulded Case Circuit Breakers and are devices used to open and close a circuit manually and interrupt the circuit automatically on the occurrence of faults.…

Continue ReadingDifference between MPCB and MCCB

Difference between RCCB and RCBO

RCCBs and RCBO are residual current protection devices. Residual current protection is achieved by monitoring the flow of current in the line and neutral. In a healthy circuit, the current…

Continue ReadingDifference between RCCB and RCBO
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