Controlled cycling thermal protector
First Claim
Patent Images
1. A protective device comprising:
- a thermally conductive sealed envelope and a pair of electrodes disposed therein, one of said electrodes being stationary and the other being movable, said movable electrode having a heat responsive element, said electrodes further being disposed in an opposed relationship to each other whereby to open the contact between said electrodes when a predetermined temperature level is reached; and
a PTC heater comprising a ceramic body and a pair of electrodes disposed on each side of said body, said PTC heater being disposed external of said sealed envelope and in a heat-transmitting relationship therewith; and
a pair of electrical contact means attached to the exterior of said envelope; and
means connecting each of said contact means to each of said lead-in wires, and connecting each side of said PTC heater in parallel with said electrodes.
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Accused Products
Abstract
A controlled cycling thermal protector device is provided comprising a snap blade and a PTC resistive heater disposed outside of a bulbous envelope in which the snap blade thermal protector is housed. The snap blade thermal protector and the resistive PTC heater are wired and constructed so as to prevent cycling of the snap blade thermal protector. The PTC heater is disposed upon a sleeve which encircles the bulbous envelope so as to radiate heat onto the snap blade thermal protector to keep it open once the circuit has been broken.
4 Citations
6 Claims
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1. A protective device comprising:
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a thermally conductive sealed envelope and a pair of electrodes disposed therein, one of said electrodes being stationary and the other being movable, said movable electrode having a heat responsive element, said electrodes further being disposed in an opposed relationship to each other whereby to open the contact between said electrodes when a predetermined temperature level is reached; and a PTC heater comprising a ceramic body and a pair of electrodes disposed on each side of said body, said PTC heater being disposed external of said sealed envelope and in a heat-transmitting relationship therewith; and a pair of electrical contact means attached to the exterior of said envelope; and means connecting each of said contact means to each of said lead-in wires, and connecting each side of said PTC heater in parallel with said electrodes. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification