Resettable overcurrent device helps comm equipment meet international requirements -

Resettable overcurrent device helps comm equipment meet international requirements

The PolySwitch TSM600-400, developed by Raychem Circuit Protection, is a 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, small-footprint, and low-resistance, is designed for use in high-density multi-port line cards and other space-constrained communications network equipment. The TSM600-400 incorporates two matched, low-resistance PPTC (polymeric positive temperature coefficient) components in one package, yielding highly balanced resistance characteristics. It's 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 has a typical resistance of 1.2 ê, and the two components are typically matched to better than 0.3 ê. In addition to interrupting ac power faults, the device helps equipment comply with Telcordia GR-1089 Issue 3 lightning tests, and has a rated hold current of 400 mA at room temperature. The devices are tape and reel packaged for compatibility with high-volume assembly processes. In lots of 100,000, it sells for $1.00. For further information visit

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