Protectowire Linear Heat Detector is made in multiple temperature ratings to allow for differences in normal or ambient temperature. Guidelines for selecting the proper detector temperature rating are the same as for automatic sprinklers and other heat actuated devices. Refer to the Temperature Rating Chart for proper model selection based upon installation temperature limits.
 
The Detector’s product range consists of four distinct types of cable. Each designation identifies a specific outer jacket material which has unique characteristics that have been selected to accommodate the widest range of installation environments.

Type EPC
Type EPC Protectowire consists of a durable flame retardant vinyl outer jacket. This series is best described as multi-purpose and is well suited to a wide range of both commercial and industrial applications. The outer jacket provides good all-around performance for most installations. It features low moisture absorption, resistance to many common chemicals, and excellent flexibility at low temperatures.

Type EPR
The EPR series contains an extruded flame retardant jacket of polypropylene elastomer with a special UV stabilizer added to enhance weathering performance. It is intended for a wide range of industrial applications and is characterized by high resiliency, good abrasion resistance, excellent weathering properties and exceptional high temperature performance. EPR provides better overall performance at higher ambient temperatures than either EPC or EPN

TRI-WIRE™ - Dual Temperature - Vinyl Jacket
Type TRI Protectowire is a unique dual temperature detector which is capable of initiating separate pre-alarm and alarm signals once each of its rated activation temperatures is reached. The Detector consists of a durable vinyl outer jacket which features low moisture absorption, resistance to many common chemicals, excellent flexibility and flame retardant.

TYPE XCR - Fluoropolymer Jacket
Type XCR utilizes a high performance fluoropolymer jacket.  This detector is specifically designed for use in applications where extreme environmental and product performance criteria must be met.  In general, the flame retardant, low smoke XCR jacket provides excellent abrasion resistance and mechanical properties over a broad range of temperatures.  It provides excellent chemical and permeation resistance to a wide variety of acids, bases, and organic solvents as well as simple gases.  In addition, the jacket exhibits very little change in tensile properties upon outdoor exposure to sunlight and weather.

TYPE XLT - Vinyl Polymer Jacket
Protectowire Type XLT is a unique detector that has been designed for use in cold storage facilities and other applications that require a low alarm activation temperature.  The outer jacket consists of a proprietary flame retardant polymer that is specifically formulated to provide low moisture absorption, good chemical resistance, and excellent low temperature environmental performance.  This detector has been UL and FM tested to -60°F (-51°C).