CURRENT LIMITING CIRCUIT BREAKERS WITH PTC (POSITIVE TEMPERATURE COEFFICIENT RESISTIVITY) ELEMENTS AND ARC EXTINGUISHING CAPABILITIES

摘要

A Positive Temperature Coefficient Resistivity (PTC) element has a resistivity that increases as the temperature increases. Circuit breakers having PTC elements can achieve better overload and short circuit protection than existing products. Circuit breakers hving PTC elements are also configured as current limiting devices for low, medium and high voltage applications wherein the amount of arcing is reduced and the arc is extinguished by interposition of an insulating body between the contacts.