Circuit Breaker Arcing
Circuit breakers are switches designed to open and close circuits. They may be operated manually or automatically through … Read More
Two Wire Control
Two Wire Control The stop and start push-button switches, in motor and other control circuits, are convenient ways … Read More
Contactors and Relays
A relay is simply an electromagnetically operated switch. A contactor is also an electromagnetically operated switch that controls … Read More
Power and Energy Meters Types
Power meters in the times of mechanical instruments required two coils, one for voltage connected across the circuit … Read More
SCR Thyristor Phase Control
This article explores phase control techniques in thyristor power systems, focusing on controlling AC and DC loads through … Read More
Programmable Unijunction Transistor (PUT) Basics
The programmable unijunction transistor is a device that overcomes the major disadvantages of the UJT. This article covers … Read More
Unijunction Transistor (UJT) Basics
Thyristor power-control devices must be accompanied by a circuit that provides pulses of current to the gate terminal … Read More
TRIAC Basics
This article covers Triac Construction, Operating Principle, Circuit Characteristics, Testing Procedure, and Applications, along with the relevant circuit … Read More
Silicon-Controlled Rectifier (SCR)
This article covers Silicon-Controlled Rectifier (SCR) construction, Operation, Commutation, Characteristics, Gate Requirements, Testing, and Applications along with the … Read More
AC Power Control Methods
A wide variety of methods has been developed to control the AC power in a load. Some have … Read More
Electric Motor Protection Devices
Generally, the circuits supplying electric motors should be protected against overload and fault currents. In addition, any unattended … Read More
DC Motor Protection Methods
In general, DC motors require the same sort of protection as AC motors. Thermal and magnetic overload protection … Read More