Safety fuse assembly provided with an electro-optical indicator device
First Claim
1. A safety fuse assembly comprising two contacts, a substantially hollow cylindrical insulating body extending between the contacts and having an exterior surface, and an interior surface defining the interior body hollow, a fuse wire extending between said two contacts through the cylinder hollow, an electrically conductive highly resistive layer located on one of said body surfaces, said layer having at least one tapping point,and an optoelectrical indicator means connected in series to at least one of said layer tapping points,said optoelectrical indicator means and said electrically conductive highly resistive layer being electrically connected in parallel to said fuse wire.
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Accused Products
Abstract
A safety fuse assembly having a body of insulating material in which a fusible conductor extends embedded in a quenching medium between two electrical contacts. The assembly is provided with an electro-optical indicator connected in parallel with the fusible conductor via a high resistance circuit. To increase the fuse capacity of the safety fuse assembly, the circuit is formed as an electrically conductive, highly resistive thin layer having one or more tapping points and which acts as a voltage or current divider circuit. This makes it possible to maximize the internal volume of the fuse chamber, thereby enabling increases in the length of the fusible conductor and the amount of quenching material, whereby usage of the internal volume of the safety fuse assembly can be optimized.
31 Citations
13 Claims
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1. A safety fuse assembly comprising two contacts, a substantially hollow cylindrical insulating body extending between the contacts and having an exterior surface, and an interior surface defining the interior body hollow, a fuse wire extending between said two contacts through the cylinder hollow, an electrically conductive highly resistive layer located on one of said body surfaces, said layer having at least one tapping point,
and an optoelectrical indicator means connected in series to at least one of said layer tapping points, said optoelectrical indicator means and said electrically conductive highly resistive layer being electrically connected in parallel to said fuse wire.
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2. A safety fuse assembly comprising two contacts, a substantially hollow cylindrical insulating body extending between the contacts and having an interior and exterior surface, a fuse wire extending between two contacts through the body hollow, an electrically conductive highly resistive layer located on the outer surface of said hollow cylindrical insulating body, and an optoelectrical indicator means connected in series to the layer, said optoelectrical indicator means and said electrically conductive highly resistive layer being formed as a hybrid circuit which closely conforms to the exterior surface of said hollow cylindrical insulating body, said optoelectrical indicator means and said electrically conductive highly resistive layer being electrically arranged in parallel to said fuse wire.
Specification