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Circuit Breaker Type K range of oil circuit breakers have been designed for use on systems upto 660 volts and for normal current ratings upto 1200 A.
The Circuit breakers are of fabricated sheet steel construction and specially designed for installations in situation where reliability and robust construction are essential.
All circuit breakers are subjected to a series of routine mechanical and electrical tests to ensure proper and reliable working in service.
The circuit breaker has double break contacts, the contacts being of spring loaded multifinger type engaging with a moving crossbar and giving high-pressure line contact. The trip free operating mechanism is self contained and all working parts are
ely electroplated. Gaskets are provided to prevent oil throw and to seal off dirt and dust. Mechanical ON/OFF indication of the breaker is provided and connections are available for electrical indication. All circuit breakers of the same rating are interchangeable. Isolating contacts The main isolating finger contacts are of the self aligning multiple plug-andsocket type with silver to silver contact faces, and designed to ensure highpressure multi-line contacts; they are mounted on robust insulation bases. Secondary isolating plugs and sockets which are spring mounted to ensure selfalignment are provided for auxiliary and control circuit connections. Interlocks A system of mechanical interlocks ensures that it is not possible to make or break the load on the isolating contacts or remove the breaker tank and top plate while the circuit breaker is ON. Trip Coils Any combination of over current, earth fault, under voltage and shunt trip coils, upto a maximum of four, can be incorporated. Over current coils are adjustable from 75% to 200% of the full load current and are fitted with oil dashpot tie lages having an inverse tie characteristic. The settings of the overload trip coils can be adjusted from the front of the circuit breaker. The dashpots are fitted with a padlocking device to prevent unauthorised alteration of the settings. Earth fault trip coils are available with tappings to suit individual requirements.
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ICTET 4511 3105 123
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