Electricity: electrical systems and devices – Safety and protection of systems and devices – High voltage dissipation
Patent
1988-01-07
1989-07-25
Jennings, Derek S.
Electricity: electrical systems and devices
Safety and protection of systems and devices
High voltage dissipation
361 91, 361 93, 361118, 361120, H02H 320
Patent
active
048519570
ABSTRACT:
A safety device for telecommunication equipment wherein a telecommunication circuit is promptly grounded when overvoltage is applied to the circuit or overcurrent is led to it and in which the production of excessive head and of damage to the communication equipment is prevented. The safety device includes an overvoltage protective circuit which comprises a ceramic discharge tube having a ground electrode on the middle part of the discharge tube, and end electrodes on opposite sides of the discharge tube; a shorting member positioned between the ground electrode and the end electrodes; and insulating means for preventing the shorting member from electrically coupling the ground electrode and the end electrodes, the insulating means including a low melting temperature material which is melted upon the release of heat by the ceramic discharge tube at a desired temperature as a result of an overvoltage for causing the shorting member to electrically couple and provide a short circuit between the ground electrode and the end electrodes. The overcurrent protective device includes heat coils and bimetal switch means for grounding the overcurrent when the coils are continuously heated for a period of time by the overcurrent.
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patent: 4692833 (1987-09-01), Chung
patent: 4723190 (1988-02-01), Chung
patent: 4729055 (1988-03-01), Doriual et al.
Jennings Derek S.
Samhwa Electric Industrial Co., Ltd.
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