Texas Instruments Corporation

Michael L Bouffard

John Lincoln Grant

Radi Pejouhy

A miniature, solid state motor protector has a metallic housing with two hingedly connected recessed portions with a wafer of positive temperature coefficient (PTC) of resistivity material disposed in each recess in electrical connection with the housing and a center spring contact located intermediate the two PTC wafers and in electrical connection therewith so that the wafers are electrically connected in parallel relation.

Miniature motor protector apparatus and method for assembling thereof

An electrical heater device includes a disc-like ceramic resistor element of a material of positive temperature coefficient of resistivity having contact surfaces formed on a broad opposite sides of the element. A pair of device terminals engage respective contact surfaces of the resistor element for directing electrical current through the element. At least one of the terminals has a plurality of protuberances resiliently engaged with a limited area of one contact surface of the resistor element to provide good electrical connection to the element in a convenient manner. In addition, an inert silicone material having a metallic particulate dispersed therein is disposed between the terminal and the remaining area of the contact surface of the resistor element to maximize heat transfer from the element to the terminal so that heat generated by the resistor element is efficiently emitted from the heater device.

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Pawtucket, RI, United States of America

Michael L Bouffard