Littelfuse 250S Series of POLYFUSE® Resettable PTCs are polymer-based high voltage radial devices suitable for protecting telephone equipment against lightning and power cross strikes. The Littelfuse 250S Series is fully compatible with telecommunications standards and is offered in horizontal and vertical surface mount packages. Littelfuse 250S POLYFUSE Resettable PTCs are designed for use in customer premises equipment, central office / telecom centers, LAN / WAN equipment, and access equipment.
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