MCCB – Molded Case Circuit Breaker | Working Principle | Ratings

An MCCB or Molded Case Circuit Breaker is a modular device used to protect a piece of low voltage equipment or circuit from overload and short circuits. Apart from overloads and short circuits, specially designed MCCBs can protect against ground faults or residual currents. They can be used for power distribution, motor protection, and as … Read more

Interview questions on PLC (Programmable Logic Controllers)

Here are the most frequently asked Interview questions on PLC. This article aims to cover most of the interview questions on programmable logic controllers so as to prepare you to crack a job interview. List of Interview questions on PLC What is a PLC? PLC stands for ‘Programmable Logic Controller’. It is an industrial computer … Read more

Interview question – Induction Motors

Here are the most frequently asked questions on Induction motors. This article aims to cover most of the interview questions on induction motors so as to prepare you to crack a job interview. Interview questions on induction motors What is an induction motor? An induction motor is an electric machine that converts electrical energy into … Read more

Interview Question – Variable frequency drives

Here are the most frequently asked interview questions on Variable frequency drives (VFD/VSD). This article aims to cover most of the interview questions on induction motors so as to prepare you to crack a job interview. Interview questions on variable frequency drives What is a VFD? Variable frequency drives/ variable speed drives/ VFD/ VSD are … Read more

MOS Turn-Off Thyristor (MTO)

MTO stands for MOS turn-off thyristor. It is a high-power bipolar MOS thyristor that constitutes both MOSFET and Gate Turn-off thyristor (GTO). It was developed as a replacement for GTO. It is a latching device that outperforms MCT and IGBT when it comes to power and blocking voltages. It was developed by Silicon Power Company (SPCO) … Read more

Difference between Transistors and Thyristors

Transistors and thyristors are semiconductors switching devices. They are used for controlling current flow in circuits. They play a very important role in all power conversion devices. In this article let us compare and understand the difference between transistors and thyristors. The key difference between Transistors and thyristors Transistor Thyristor Basic Structure A transistor is … Read more

The difference between kVA and kVAR

The difference between kVA and kVAR is pretty simple. “kVA” is the unit of apparent power whereas “kVAR” is the unit of reactive power. Before getting into the topic, we recommend you to understand apparent power and reactive power better, by reading this: Real, Reactive, Complex, and Apparent power. Now, let us compare both of … Read more

TRIAC – Operation, symbol, circuits & applications

A TRIAC or TRIode for Alternating Current is a three-terminal bidirectional thyristor, meaning that can conduct current in both directions when activated properly. It is used in AC switching applications. It can be considered as two SCRs connected in antiparallel. Unlike a silicon-controlled rectifier, it is capable of conducting positive and negative cycles of electric … Read more

Surge Protection Device (SPD) | Surge protector

A surge protection device (SPD) or simply a surge protector is a device used to ensure protection against transient surges. It is used to protect the household and commercial applications from voltage transients. It is connected in parallel to the load it has to protect. What is a transient surge? A transient surge is a … Read more

Thyristors and their types

Thyristors are high-speed semiconductor switching devices that are made up of four layers of alternating p and n-type materials. They are used in AC/DC switching and AC power control applications. The thyristor symbol is a diode symbol that has three terminals, the gate, anode, and cathode. Silicon Controlled Rectifier (SCR) Silicon Controlled Rectifier (SCR) is … Read more