PPTCs Extend Protection To Line-Voltage Applications

July 8, 2002
Polymeric positive temperature coefficient (PPTC) devices traditionally provide resettable circuit protection against overcurrent and overtemperature conditions. Yet their low voltage ratings limit their application to secondary-side protection of...

Polymeric positive temperature coefficient (PPTC) devices traditionally provide resettable circuit protection against overcurrent and overtemperature conditions. Yet their low voltage ratings limit their application to secondary-side protection of power supplies and transformers.

The LVR Series of PolySwitch resettable devices expands their role to primary-side applications by increasing the PPTC's voltage ratings to 240 V ac, permitting their use at maximum voltages up to 265 V ac. As members of the Raychem Circuit Protection product line, the LVR Series PPTCs are available in hold currents ranging from 50 to 400 mA. Trip currents are generally specified at 2 to 2.5 times the hold current.

In production quantities, which are typically 250,000 pieces per year, pricing ranges from $0.20 to $0.34 per unit. Samples are available now with volume delivery in eight to 12 weeks.

Tyco Electronics, www.tycopowercomponents.com; (800) 227-7040.

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