Potter CR-135EWT Explosion Proof

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  • Regular price $391.50

A cast aluminum housing encloses a standard Thermoflex® heat detector making it suitable for use in hazardous locations including those requiring detectors that are explosion proof, water and dust tight. The suffix EWT denotes a unit that is suitable for areas described as: Class I: Groups C and D, Class II: Groups E, F, and G, Class III: Applications requiring Special Purpose Enclosure Types III, IV and V, Weatherproof, Water-tight, and Dust-tight.

The Thermoflex® product group includes standard detectors as well as detectors for hazardous locations and moisture-proof applications. Each detector is available in single or multiple circuits with open and/or closed contact configurations. The prefix CR in the model number denotes rate-or-rise and fixed temperature operation.

The CR-135EWT is a combination rate-of-rise and fixed temperature detector in a case aluminum housing suitable for use in the hazardous locations described above. A set of normally open contacts will close when the ceiling temperature increases at a minimum rate of 15°F (8.4°C) per minute. Closing the contact initiates the direct alarm sequence. Independent of the rate-of-rise operation, the fixed temperature portion consists of a spring-loaded plunger retained by a fusible alloy that releases when the ceiling temperature reaches 135°F (57°C). When released, the plunger strikes the set of contacts and holds them closed. Spacing between detectors on an uninterrupted ceiling is 50 ft. (15.2m) for the rate-of-rise and 30 ft. (9.1m) for the fixed temperature portion. Distance from any wall or partition is 25 ft. (7.5m) and 15 ft. (4.5m) respectively.


Detector Housing: ULC Listed, Explosion Proof, Water and Dust Tight
Contact Ratings: 3 Amps at 125 VAC / 1 Amp at 28 VDC / 0.3 Amps at 125 VDC / 0.1 Amps at 250 VDC
Dimensions: Diameter - 5.5" (14 cm) Height - 3.6" (9.3 cm)