CIRCUIT PROTECTION DEVICE HAVING THERMALLY COUPLED MOV OVERVOLTAGE ELEMENT AND PPTC OVERCURRENT ELEMENT

摘要

In a composite electrical circuit protection device (10), thermal coupling between a planar PPTC element (12) and a planar MOV element (14) is controlled by insertion of a thermal mass material (13) for regulating heat transfer from the MOV element to the PPTC element, such that a PPTC resistor hot zone forms consistently away from the planar major foil electrode confronting the MOV thereby regulating heat transfer from the MOV to the PPTC resistor.