sf6 circuit breaker

Sulphur Hexaflouride (SF6) Circuit Breakers

A circuit breaker in which the current carrying contacts operate in  sulfur hexafluoride or SF6 gas is known as SF6 circuit breaker. SF6 is a very good dielectric material which can resist high potentials.SF6 gas is used as the arc quenching medium Sulfur Hexafluoride (SF6) is an electro-negative gas and has a strong tendency to absorb free electrons. Whenever circuit breaker opens…


Vacuum Circuit Breaker VCB

In such vacuum circuit breaker, the arc quenching medium is vacuum (degree of vacuum being in the range from 10-7 to 10-5 torr ). As vacuum is height insulating strength, so the vacuum has far superior arc quenching than others medium. When contacts of breaker are opened in vacuum, the interruption occurs at first zero…

universal motor

Universal Motor construction and working operation

What is Universal Motor A universal motor is a special type of motor which is designed to run on either DC or single phase AC supply. These motors are generally series wound (armature and field winding are in series), and hence produce high starting torque. That is why, universal motors generally comes built into the…

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