Raychem Circuit Protection announces the PolySwitch TSM600-400, low resistance, resettable overcurrent protection device for communications infrastructure applications. This RoHS-compliant device helps equipment comply with recent worldwide telecommunications standards such as: Telcordia GR-1089 Issue 3, UL 60950 3rd edition and TIA-968-A (formerly FCC Part 68), and can also be used in systems designed to ITU-T K.21 & K.21 recommendations.

The device, with its surface-mount configuration, incorporates two matched, low-resistance PPTC (polymeric positive temperature coefficient) components in a single package, yielding highly balanced resistance characteristics. This newly developed PolySwitch device is primarily intended for use in “grounded” communications systems such as POTS and xDSL linecards. Each of the two resettable overcurrent protection components in the TSM600-400 device has a typical resistance of 1.2 Ohms, and the two components are typically matched to better than 0.3 Ohms. In addition to interrupting AC power faults, the device is designed to help equipment comply with Telcordia GR-1089 Issue 3 lightning tests, and has a rated hold current of 400mA at room temperature. This device is designed for operating temperatures between -40C and +85C, and withstands soldering temperatures of up to 260ºC for 60 seconds maximum. Price: $1.00 in quantities of 100k units.