Difference between Short circuit and overload
Short Circuit A short circuit occurs when two or more current-carrying conductors of different phases or different voltage levels or different terminal (in DC circuits) come in contact with each…
Miniature circuit breaker (MCB) – Principle of operation
Miniature circuit breakers commonly known as MCB, are mechanically operated switches cum circuit protection devices. It is an electro-mechanically operated automatic circuit protection device and is used to interrupt a…
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…
Difference between circuit breaker and isolator
The circuit breakers and isolators serve a common purpose of circuit interruption. The primary difference between them lies in their behavior during faults in the circuit. In this article, let's…
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 (B, C, D, K, and Z…
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 can…
Buchholz relay – Working Principle, Construction and Operation
A Buchholz relay in a transformer is an oil-activated relay, used to sense abnormalities such as short circuits, overheating, and oil leakages inside a transformer. It is a cylindrical object…
Selection of contactor and overload relay for DOL starter
The below article can guide you through the selection of contactors and overload relays for a three-phase DOL starter and how to optimally size a DOL starter. Data required for…
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…
Contactor – Construction, Operation, Application and Selection
A 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 or…