H - Electricity – 02 – H
Patent
H - Electricity
02
H
317/12.4
H02H 9/06 (2006.01) H01T 1/14 (2006.01) H01T 4/06 (2006.01)
Patent
CA 1202670
- 22 - PROTECTOR UNIT FOR TELECOMMUNICATIONS CIRCUITS Abstract A protector unit for protecting tip-and-ring conductors of a telephone loop includes a pair of protector assemblies which are supported within a common housing. A voltage protection subassembly is connected electrically to a ground subassembly for causing current associated with excessive voltage surges to be conducted to ground. Each protector assembly includes a heat coil subassembly mounted on a dielectric half-base, together with a central office pin. The heat coil subassembly includes a line pin, an eyelet, disposed concentrically about the line pin and releasably secured to one end of the line pin in an initial position by a fusible bonding material, and a resistance wire wound about the hub of the eyelet. One end of the wire is welded to the eyelet, and the other end is welded to the central office pin to establish a direct current path between the line pin and the central office pin. The two base halves and the components disposed thereon are held in mated position theretogether by the protector housing. A spring between a cup of the voltage protector subassembly and the housing maintains the voltage protection subassembly in engagement with the eyelet. Also, the spring is effective when current flow exceeds a predetermined level that is sufficient to cause the fusible bonding material to melt to cause the eyelet to be moved to a position where it engages a portion of the grounding subassembly to establish a fault current path to ground potential.
427895
Kirby Eades Gale Baker
Western Electric Company Incorporated
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