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Wickmann fuse protects against power crosses

Posted: 05 Jan 2004 ?? ?Print Version ?Bookmark and Share

Keywords:wickmann? polyfuse hvr250? positive temperature coefficient? pptc? resettable fuse?

Wickmann has introduced the Polyfuse HVR250 series of Positive Temperature Coefficient (PPTC) devices that protect telecommunications and networking equipment against lightning strikes and power crosses.

The polymer-based device resettable fuses are designed to provide overcurrent for xDSL and ISDN modems, splitters, and MDF equipment that must comply with ITU K.20, K.21, K.45 and Telcordia GR-974 requirements.

Available in coated and uncoated versions with hold currents from 80mA to 180mA, the product can withstand a maximum of 250Vac interrupting voltage to comply with the ac power cross tests and to operate at up to 60Vdc with low internal resistance. The small footprint, low-resistance, through-hole device features high resistance stability after every overcurrent event caused by an ac power cross.

Packaged in tape and ammopack per the EIA-481 standard or in bulk, the HVR250 protects the equipment from induced current conditions and automatically resets after correction of the fault. Lead-free devices are available for 80mA and 180mA hold currents.

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