Line protector for a communications circuit

Details Line protector for a communications circuit Line protector for a communications circuit

H - Electricity

01

C

317/12.4

H01C 7/12 (2006.01) H01C 8/04 (2006.01)

Patent

CA 1137544

Baumbach Case 284 Abstract of the Disclosure A line protector for a communications circuit comprises an insulating base (6) having a ground pin (16) and two pairs of line pins (8, 10; 12, 14), one pair for each side of the line, projecting through the base. Each pair of line pins has a contact (20, 20a) electrically con- nected thereto and projecting away from the base. The ground pin also has a contact (22) projecting away from the base and spaced from the line pin contacts. A metal oxide varistor (24) having opposed faces (26, 28) provides surge voltage protection for each side of the line. The line pin contacts are bonded to one face (28) of the varistor while the ground pin contact is bonded to the other face (26) of the varistor. Electrically conductive spring clips (30, 32, 36) span the varistor and are pressed toward its opposite faces and in electrical contact with the ground pin contact (22). An insulating sheet (34) is interposed between the clips and the line pin contacts to prevent one or more of the clips from grounding the line except in such surge condition that heats the varistor sufficiently to melt the insulation (34).

346088

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