Surge protection device and system

Electricity: electrical systems and devices – Safety and protection of systems and devices – Load shunting by fault responsive means

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Details

361118, 361127, H02H 324

Patent

active

052240088

ABSTRACT:
A surge protection system has a surge protection device comprising a semiconducting disc element disposed between two electrodes. The element is operable to selectively conduct electrical energy between the electrodes in providing a first level of surge protection for the circuit, and the electrodes are adapted to move toward each other to maintain a short circuit condition between the electrodes in the event the element is destroyed in providing a second relatively greater level of surge protection. The semiconducting element provides a critical energy conduction path between a selected limited portion of one side of the element and the other element side along which destruction of the element preferentially occurs due to overheating in providing the second level of surge protection. One electrode has a selected limited post portion disposed in electrical engagement with said selected limited portion of said one element side to facilitate establishment and maintenance of the short circuit condition between the electrodes in providing the second level of surge protection.

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"Telecommunications Protector Circuits-Protection Design Guide", Texas Instruments Ltd., Bedford England.

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