A Website on Maintenance of Electrical Systems

A Relay is an electrically operated switch, it basically consists of an electromagnetic coil which builds up a magnetic field when current is passed through it. This magnetic field is used to operate the relay contacts to an OFF or ON state. A Contactor is an electrically operated switch, it basically consists of an electromagnetic coil which builds up a magnetic field when current is passed through it. This magnetic field is used to move the contactor contacts into an OFF or ON state. So what is the difference between a relay and a contactor. In the most simplistic terms, a contactor is a  relay  is used to switch a large amount of electrical power through its contacts . Other notable differences are stated below. 1)     Relays tend to be for logic switching while contactors are for Power switching 2)     Relays don’t come with auxiliary contacts while many contactors have provision for auxiliary contacts 3)   ...

Mercury Vapor lamp is one of many kinds of electric lamps designed to produce light from electricity. Other types of electric lamps available in the marled include the Incandescent bulb, LED bulb, Florescent, sodium Vapor, and Metal Halide. Electric lamps could be broadly divided into two categories. 1)     Incandescent 2)    Gaseous Discharge Lamp. Gaseous discharge lamps could be further divided into High pressure and low-pressure gaseous discharge lamps. Mercury Vapor lamps fall under the Gaseous discharge lamp category. Other lamps in this category are Metal halide and high and low-pressure sodium lamp and fluorescent lamp. All gaseous discharge lamps generate light using the same principle i.e. passing an electrical arc through a gas. Mercury Vapor lamps fall under the High-Pressure Gaseous Discharge lamp category. They are also commonly referred to as High Intensity Discharge (HID) lamps. Metal Halide and High-pressure Sodium (HPS) lamps are a...