Low inductance shunt for current limiting polymer applications
AssigneeEaton Corporation
InventorJohn Joseph Shea
Life of this patent
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Abstract
Electrical devices based on current limiting PTC polymer devices, and in particular, electrical circuit protection devices containing a current limiting PTC polymer device composed of a current limiting polymer composition in combination with suitable electrodes and a low inductance shunt to protect the current limiting polymer composition from exceeding its breakdown field strength. Specifically, electrical devices containing a current limiting polymer composition in combination with suitable electrodes and a low inductance shunt in the form of a ribbon shunt, i.e. a flat sheet of conductive material folded over on itself.
Claims15
An electrical device, comprising:
- a current limiting polymer composition;
- at least two electrodes attached to said current limiting polymer composition;
- and
- a ribbon shunt connected to said at least two electrodes in electrical parallel with said current limiting polymer composition;
- wherein the ribbon shunt is folded over onto itself;
- wherein the ribbon shunt is constructed of stainless steel and wherein the ribbon shunt has a resistivity of 56 .mu..OMEGA..cm to 85 .mu..OMEGA..cm.
A molded case circuit breaker, comprising:
- a current limiting polymer composition;
- at least two electrodes attached to said current limiting polymer composition;
- and,
- a ribbon shunt connected to said at least two electrodes in electrical parallel with said current limiting polymer element;
- wherein the ribbon shunt is folded over onto itself;
- wherein the ribbon shunt is constructed of stainless steel and wherein the ribbon shunt has a resistivity of 56 .mu..OMEGA..cm to 85 .mu..OMEGA..cm.
Dependencies are inferred from the claim text.