STI-1200A-HTR Stopper II Heated Enclosure with 4" Deep Backbox






Stopper® II Heated Enclosure with 4" Deep Backbox


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Protect your pull stations and similar devices located where temperature or environmental conditions exceed the suggested operating range with our protective cover fitted with a heater assembly.

STI-1200A-HTR consists of a clear, tamperproof, super tough polycarbonate cover, housing for an instructional operation label, gasket, NEMA 4X conduit hub, fan, silicone laminate heater and four inch deep NEMA 3R backbox. The standard STI-1200A -HTR accommodates most manual pull stations and is marked with an "IN CASE OF FIRE" message, but can be custom labeled and used to protect many other devices. The thermostatically controlled 110 VAC heater and continuous duty fan maintain a uniform temperature inside the enclosure when temperatures drop. Applications include, but are not limited to, refrigerators, freezers, meat packaging plants, arctic environments, ocean rigs, slaughter houses, etc. This enclosure is designed to protect UL Listed 38 and 2017 initiating devices at temperatures down to -70ËšF (-57ËšC)



  • Maintains operating initiating device temperature with external temperatures to -70°F (-57°C).
  • Protects initiating devices for addressable monitor modules to UL 38 Standards.
  • The clear, protective polycarbonate cover is UV-stabilized.
  • Enclosure rated to NEMA 3R Standards to provide a degree of protection against rain, sleet and damage from external ice formation.
  • Fan runs continuously to maintain a uniform temperature inside the enclosure.
  • Heater units cycle as required to maintain the correct range of operating temperatures.
  • 110 VAC heater.
  • Rated for indoor and outdoor applications.
  • All initiating stations are required to be outdoor rated by UL.
  • Typical working properties of polycarbonate are -40° to 250°F (-40° to 121°C).
  • Lifetime guarantee against breakage of polycarbonate in normal use (one year on electro mechanical and electronic components).
  • Comes standard with an "IN CASE OF FIRE - LIFT COVER PULL FIRE ALARM" label.
  • Custom labeling available (incurs a fee).


  • Model: STI 1200AHTR
  • 0 Units in Stock
  • Manufactured by: STI Safety Technology Int'l

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