Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Automatic circuit-interrupting devices
Patent
1974-04-09
1976-01-13
Harris, G.
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Automatic circuit-interrupting devices
335 10, 317119, H01H 7702
Patent
active
039328252
ABSTRACT:
Circuit-breaker system having a response time to shortcircuits of less than 4 milliseconds have multiple coordinated pole units wired in series in each phase. The system is able to clear a fault where the available current is high, for example 100,000 amperes at 240 volts AC although each pole unit may be of conventional construction having a current-interruption rating of only 5 or 10 thousand amperes. The operation exhibits current limiting properties, and the interruption process leaves the pole units remarkably free of arc damage.
REFERENCES:
patent: 3187147 (1965-06-01), Dietz et al.
patent: 3218519 (1965-11-01), Casey
patent: 3333157 (1967-07-01), Stokes
patent: 3349290 (1967-10-01), Casey
patent: 3573415 (1971-04-01), Gryctko
patent: 3745415 (1973-07-01), Polley et al.
Federal Pacific Electric Company
Harris G.
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