Minimum Oil Circuit Breaker These types of circuit breakers also utilize oil (transformer oil) as an interrupting medium. Unlike bulk oil circuit breakers, these designs place the interrupting units in insulating chambers at the live potential. This feature of the design of MOCBs reduces the requirement of oil and these breakers are therefore known as minimum oil circuit breakers . These I designs are available in voltages ranging from 1000 V to 765 kV using the multi-break technique. A typical view of 36 kV MOCB indicating the main parts is shown in figure 4.24. This type of breaker is Widely used in transmission and distribution networks. In an oil circuit breaker, they are drawn across the contacts are contained inside the interrupting pot and thus the hydrogen bubble, formed by the vaporized Oil (gas) is also contained inside the chamber. As the contacts continue to move and When the moving contact rod separates itself from the orifice at the bottom of the chamber, an exit similar