Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Automatic circuit-interrupting devices
Patent
1976-05-10
1977-09-13
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Automatic circuit-interrupting devices
335155, H01H 8300
Patent
active
040485994
ABSTRACT:
An electric switching device has a selector shaft that drives a switching element between a "cut-out" position in which the switch is open and a "cut-in" position in which the switch is closed. In the cut-in position, a set of "movable" electric contacts carried on the switching element each make electrical connection with a corresponding "fixed" contact supported on a housing. A cut-out mechanism automatically opens the switch when the voltage across the switch falls below a predetermined value (an undervoltage condition). The cut-out mechanism includes an electromagnet, wired in series with the switch, which controls the movement of the blocking lever. The blocking lever is movable between a blocking position in which it holds the switching element in its cut-in position, and a release position in which it allows the switching element to move to its cut-out position. A control element and a release lever provide an operative connection between the electromagnet and the blocking lever such that the blocking lever moves from its blocking position to its release position in response to an undervoltage condition. In addition, the switch will not automatically reclose when the voltage rises above the predetermined value, and if manually reclosed during an undervoltage condition, the switch will not remain closed.
REFERENCES:
patent: 3264428 (1966-08-01), Hollyday
patent: 3559125 (1971-01-01), Ellis
patent: 3675177 (1972-07-01), Ellenberger
patent: 3723924 (1973-03-01), Shaffer et al.
Elektra Tailfingen Ammann & Cie
Harris George
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