Tyco Electronics Debuts LVR Series PolySwitch Devices
Tyco Electronics Power Components (Menlo Park, CA) announced the introduction of its new LVR Series of PolySwitch resettable devices. Designed for use in line voltage applications, the LVR Series polymeric positive temperature coefficient devices are rated at 240Vac, permitting maximum voltages of up to 265Vac, and are available in hold currents from 50mA to 400mA. The thermally active devices can help protect against both over-current and over-temperature faults on the primary side of power supplies and transformers.
The LVR device was developed to help prevent damage to control boards and components by limiting current in the event of a load-side, short-circuit or overdraw, or improper incoming voltage. Unlike a single-shot current fuse, the resettable LVR device can help protect against conditions where faults may cause a rise in temperature with only a slight increase in current draw. When installed on the primary side of the circuit, in proximity to potential heat-generating components such as magnetics, FETs or power resistors, the LVR device can help provide both over-current and over-temperature protection with a single installed component.
The LVR devices are available in straight-lead or kinked-lead configurations, and can be supplied in tape-and-reel packaging for compatibility with high-volume assembly. UL, CSA and TUV certifications are currently pending. Available now, prices range from $0.20 to 0.34 each in 250,000-per-year volumes. Delivery lead-time is eight weeks ARO.
