Circuit Breaker Testing

Circuit breaker testing CB testing All electrical equipment’s need to be tested for assurance of their satisfactory performance. However, testing of circuit breakers is more difficult than the testing of other electrical equipment’s because the short circuit currents are very high. Testing of circuit breaker can be classified into two main groups. • Type test … Read more

What is vacuum circuit breaker?

Vacuum circuit Breaker Vacuum interrupter technology was first introduced in the year of 1960.A vacuum circuit breaker is such kind of circuit breaker where the arc quenching takes place in vacuum. The operation of opening and closing of current carrying contacts and associated arc interruption take place in a vacuum chamber in the breaker which … Read more

Circuit breaker ratings

Circuit breaker ratings The rating of the circuit breaker is given on the duties performed by it.The rating of the circuit breaker should be specified in terms of the number of poles  (the number of poles per phase of a breaker is a function of the operating voltage) rated voltage rated current rated frequency and … Read more

SF6 circuit Breaker

SF6 Circuit Breaker(Sulphur Hexafluoride) Introduction SF6 is a colorless non-toxic gas, with good thermal conductivity and density approximately five times that of air (6.14 kg/m3.).It does not react with materials commonly used in high voltage circuit breakers.Applications for SF6 include gas insulated transmission lines and gas insulated power distribution substations.The SF6 gas is identified as … Read more


Miniature Circuit Breakers(MCB)   circuit breaker are mechanical devices designed to close or open contact .It closes or opens electrical circuit under normal or abnormal condition.A circuit breaker is also a switching and current interrupting devices.It consists of fixed and moving contacts which are touching each other and carry the current under normal conditions.When the … Read more


A fuse is a part of the circuit which consists of conductor which melts easily and breaks the connection when current exceeds the predetermined value. An electrical fuse is a weakest part of an electrical circuit which breaks when more than predetermined current flows through it.Fuse are used for overload and short circuit protection in … Read more