Profile: Raychem focuses on the development of PPTC (polymer positive temperature coefficient) resettable device technology. We introduced SiBar™ thyristor surge protectors that provide transient voltage protection for telecommunication equipment. Our company develops, manufactures, and markets a complete line of PolySwitch™ resettable devices, fast acting fuses, SiBar™ thyristor surge protectors, GDT's (gas discharge tubes), ROV's (metal oxide varistors) and ESD protection devices.