Circuit breaker having an encapsulated auxiliary coil assembly
AssigneeCarling Technologies, Inc.
InventorThomas R. J. Swift
Life of this patent
Estimating the term…
Abstract
A circuit breaker which has an auxiliary coil fitted onto the primary bobbin adjacent the pole piece having a dielectric auxiliary bobbin and a dielectric bobbin housing encapsulating the auxiliary coil and forming an encapsulated auxiliary coil assembly. Both the dielectric auxiliary bobbin and the dielectric bobbin housing are comprised of a polymeric material, preferably a liquid-crystal polymer. Preferably, the liquid-crystal polymer is an aromatic liquid-crystal polyester which is reinforced with about 30% glass and has a nematic liquid-crystal structure. Furthermore, it is preferred for the dielectric strength of the liquid-crystal polymer to be about 32 KV/mm to about 35 KV/mm.
Claims21
A circuit breaker comprising:
- a housing, a frame in the housing, fixed and movable contacts in the housing;
- electromagnetic means electrically coupled to said fixed and movable contacts, said electromagnetic means including armature means movably mounted on said frame;
- a pole piece supported in fixed relationship to said frame and adapted to be engaged by said armature;
- a plunger tube for supporting said pole piece;
- a primary bobbin surrounding said tube, said primary bobbin having flanges defining an annular space;
- an auxiliary annular space defined by said primary bobbin around said pole piece;
- an auxiliary bobbin having flanges adjacent its opposite ends, said auxiliary bobbin being selectively received on said primary bobbin to occupy said auxiliary annular space, said auxiliary bobbin having one flange located adjacent a flange on said primary bobbin, and said auxiliary bobbin being comprised of a dielectric liquid-crystal polymer;
- an auxiliary coil for magnetically moving said armature means toward said pole piece in response to an over current over voltage condition in the auxiliary coil winding provided on said auxiliary bobbin, between said flanges thereof;
- and
- an auxiliary bobbin housing being selectively received on said flanges of said auxiliary bobbin to enclose said auxiliary coil, said auxiliary bobbin housing having channels for receiving wiring across said auxiliary coil, said auxiliary bobbin housing being comprised of a dielectric liquid-crystal polymer.
A circuit breaker comprising:
- a housing, a frame in the housing, fixed and movable contacts in the housing;
- electromagnetic means electrically coupled to said fixed and movable contacts, said electromagnetic means including armature means movably mounted on said frame;
- an encapsulated coil assembly for encapsulating an electromagnetic coil, said assembly comprising;
- a bobbin having flanges adjacent its opposite ends wherein said bobbin is comprised of a dielectric polymeric material;
- an electromagnetic coil provided on said bobbin, between said flanges thereof;
- a bobbin housing being selectively received on said flanges of said bobbin to enclose said coil, said bobbin housing having channels for receiving wiring across said coil, wherein said bobbin housing is comprised of a dielectric polymeric material;
- and
- wherein said electromagnetic coil is electrically connected to said electromagnetic means such that an over current over voltage condition in said coil winding serves to move said movable contact.
Dependencies are inferred from the claim text.