The major parts
of a oil circuit breaker are arc chamber, fixed & moving contacts. It also
has the gas expansion chamber, terminals, oil sump, oil draining and oil
filling plugs and the oil level indicator. The opening spring of the stored
energy mechanism is charged automatically during the closing action. The
closing spring is charged by means of an electric motor.
On separation of
the moving contact from the fixed contact in the arc chamber, high temperature
occurring and decomposes the oil (which boils at 658°K and a gas bubble is
formed .Also, the gas in the arc chamber escapes to the gas expansion chamber.
So heat dissipates.
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