|
|
작성일 : 13-04-22 15:33
|
[제품소개] LVR Series of PolySwitch(tm) Devices Provides Overcurrent and Overtemperature Protection in Line Voltage Applications at 240VAC
|
|
|
글쓴이 :
최고관리자
 조회 : 14,900
|
MENLO PARK, CA— April 16, 2003 – Raychem Circuit Protection, a unit of Tyco Electronics, announces the introduction of the LVR series of PolySwitch® resettable devices. Designed for use in line voltage applications, the polymeric positive temperature coefficient (PPTC) devices are rated at 240 VAC, permitting maximum voltages of up to 265 VAC, and are available in hold currents from 50 to 400 mA. The thermally active devices can help protect against both overcurrent and overtemperature 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 overcurrent and overtemperature protection with a single installed component.
The properties of the LVR device can provide distinct benefits in transformer protection designs. The surface temperature of the LVR device in the high resistance state is well within the range of most transformer winding insulation ratings. This low temperature operation, combined with small size, low resistance and good thermal shock tolerance, can allow the LVR device to be mounted in direct contact with the transformer windings for a faster response to potential fault conditions.
“For many years, circuit designers have relied on PPTC devices for secondary-side protection. This development makes possible, for the first time, resettable PPTC circuit protection on the primary side of power circuitry,” said Karin Kinsman, product manager for radial-leaded PPTC devices for Tyco Electronics Power Components. “Higher voltage ratings and the thermal characteristics of the LVR series PolySwitch device make it a logical and innovative solution for power supply and charger designs,” she added.
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. The LVR parts have UL and TUV certifications, and CSA certification is currently pending. For further information or technical assistance, call (800) 227-7040, or visit http://www.circuitprotection.com/lvr.
|
|
|
| | |
