Solid state electronic protector with pressure release
First Claim
1. A telephone line overcurrent protector comprising a generally cup shaped housing formed of electrically insulating material having a top wall and side wall depending therefrom for mounting on a circuit board, said side walls having a distal free end and a projection formed on a portion of the distal free end to form a selected stand off space between the protector and said circuit board when the protector is mounted, bottom cover means received on the side walls, an element of positive temperature coefficient (PTC) of resistivity disposed in the housing, the element being generally cylindrical in configuration with first and second end faces, first and second wire leads electrically coupled to the respective first and second end faces and extending out of the housing through respective apertures formed in the cover means for connecting to said circuit board, the cover means formed with pressure release means to specifically direct and confine any debris generated by a catastrophic failure of the element to a preselected location on the circuit board.
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Accused Products
Abstract
A telephone line overcurrent protector adapted to be mounted on a circuit board is shown having a cup shaped housing in which a PTC element is placed with leads extending out of the housing through apertures in a bottom cover. The bottom cover is formed in one embodiment with a frangible diaphragm to provide guided pressure release upon catastrophic failure of the PTC element, in another embodiment with open apertures in the bottom cover and in yet another embodiment with means to mount a snap out member closing an aperture in the bottom cover, both for the same purpose of providing guided pressure release.
27 Citations
9 Claims
- 1. A telephone line overcurrent protector comprising a generally cup shaped housing formed of electrically insulating material having a top wall and side wall depending therefrom for mounting on a circuit board, said side walls having a distal free end and a projection formed on a portion of the distal free end to form a selected stand off space between the protector and said circuit board when the protector is mounted, bottom cover means received on the side walls, an element of positive temperature coefficient (PTC) of resistivity disposed in the housing, the element being generally cylindrical in configuration with first and second end faces, first and second wire leads electrically coupled to the respective first and second end faces and extending out of the housing through respective apertures formed in the cover means for connecting to said circuit board, the cover means formed with pressure release means to specifically direct and confine any debris generated by a catastrophic failure of the element to a preselected location on the circuit board.
Specification