Hybrid AC Device Boasts Overcurrent, Overvoltage Protection

By combining a polymeric positive temperature coefficient (PPTC) device and a thermally enhanced metal oxide varistor (MOV) into one package, TE Circuit Protection created a hybrid device that offers an integrated, resettable approach to protect sensitive downstream electronics against damage from overcurrent and overvoltage. The resettable PPTC/MOV hybrid configuration avoids problems experienced with other typical approaches used in low-current applications to help prevent thermal runaway, such as the use of an MOV with a fuse, which must be replaced when blown; placing the PPTC device and MOV next to each other on the board, which can lead to thermal instability; and employing a thermal fuse integrated with an MOV, a one-use solution that can trip without allowing resettability. The 2Pro device, on the other hand, integrates thermally coupled components; can be reset; and provides stability by maintaining a varistor surface temperature under 150°C. Applications include LED lighting, smart meters, and power supplies.

TE CIRCUIT PROTECTION (a business unit of TE CONNECTIVITY LTD.)