FIELD: manufacturing technology.
SUBSTANCE: vacuum circuit breaker for medium voltage circuit breaker contains vacuum chamber, in which two electric contacts are arranged coaxially to each other, concentrically surrounded by cylindrical shape vacuum chamber, electric contacts are PMP-type contacts, each of which has cup-shaped contact element with cutouts, attached to contact rod far end and closed with contact ring (10) installed on cup-shaped contact element rim (11), wherein each cup-shaped contact element is equipped with inward bent in vertical direction towards contact ring (10), cup-shaped contact element lower part outer diameter is larger than this element rim (11) outer diameter, which is made in order to change Lorentz force and its direction inwards.
EFFECT: technical result is improvement of arc suppression in vacuum circuit breakers with cup-shaped PMP-contacts.
10 cl, 9 dwg
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