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SEREB® is a thermal protector integrated into the battery cells of various portable electronic devices. It interrupts the current flow when overheating is leading to dangerous levels or when over-current is causing self generation of abnormal heat levels. In these situations, the rise in temperature will cause the bimetal element within the protector to reverse, shunting the conductive line to the PTC ceramic , which would  also act as a heater to keep the bimetal element reversed until there is sufficient voltage drop.