Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – With bimetallic elements
Patent
1984-09-07
1986-10-07
Broome, Harold
Electricity: electrothermally or thermally actuated switches
Electrothermally actuated switches
With bimetallic elements
337 70, 337140, 335 14, 335 43, H01H 7116, H01H 6108
Patent
active
046162062
ABSTRACT:
A molded case circuit breaker wherein a movable contact arm (8) is operated between open and closed positions with a stationary contact (4b) by an operating mechanism which controls an overcenter toggle drive spring (12) and which is automatically openable upon sensing overload conditions by releasing a latched lever (10) for carrying the line of action of the drive spring (12) across the pivot (8a) of the movable contact arm (8). The current sensing trip means (16) for unlatching the latched lever (10) is formed of a shape memory effect alloy to provide a significant amount of travel of the latching end thereof in response to a narrow band of current thereby to insure release of the latch lever (10) without need for calibrating the breaker. The shape memory effect element (16) is affixed at one end to a heater strap (18) for indirect heating by current flow in the distribution circuit and is provided with a flexible conductor (30) attached at its opposite end and connected with a electric power source through a remote control apparatus (32) and a current limiting resistor (34) for effecting selective direct heating of the SME element to selectively operate the breaker to its tripped position from the remote location.
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Bridges Robert B.
Brubaker John R.
Broome Harold
Eaton Corporation
Grace C. H.
VandeZande L. G.
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