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(11) | EP 0 469 330 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Gas blast circuit breaker |
(57) A gas blast circuit breaker comprises an insulation nozzle (8) for blowing extinguishing
gas to an arc (9) generated between a stationary contact (1) and a movable contact
(2). The nozzle (8) has a throat section (10) into and out of which one of the two
contacts (1, 2) is movable and a divergent section (13) provided downstream of the
throat section (10). A slanting surface (11) for increasing a reflectivity of energy
intensity of the arc (9) is formed on the divergent section (13) of the nozzle (8).
The nozzle (8) is formed of a fluoroplastic material and boron nitride powder not
more than 15 vol.% added as a filler. |