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STI-1100 STI Stopper II with Horn Flush Mount with Fire Label

STI-1100 STI Stopper II with Horn Flush Mount with Fire Label
STI-1100 STI Stopper II with Horn Flush Mount with Fire Label
  • Brand: STI
  • Model: STI-1100
  • SKU: STI-1100
  • UPC: 662950110002

This unique, patented cover has helped stop false fire alarms around the world for over 30 years, without restricting legitimate alarms. Ideal for schools, hospitals, nursing homes, stores, hotels and public buildings of almost every kind.
STI-1100 consists of a clear, tamperproof, tough polycarbonate cover, frame, "IN CASE OF FIRE" message and piezo horn that fits over most manual pull stations. When lifted to gain access to the actual alarm, a piercing 95 or 105 dB warning horn sounds. Immediate attention is drawn to the area and a prankster will either run or be caught. The cover is connected to the frame by a cable. When the cover is lifted, it hangs off of the frame and the horn will sound until the cover is snapped back onto the frame (or for the life of the battery).


Polycarbonate Enclosure

  • Flammability - UL94 V-2
  • Wall Thickness - .095 inches
  • NEMA Rating - Meets NEMA 3R when mounted to smooth non-masonry surfaces


  • Closed Cell IV2 with pressure sensitive adhesive
  • Replace after 5 years


  • Low (95 dB @ 1 ft.)
    • 9V - 96mA
    • 12V - 107mA
    • 24V - 125mA
  • High (105 dB @ 1 ft.)
    • 9V - 130mA
    • 12V - 145mA
    • 24V - 182mA
  • Min. Operating Req.
    • 9V- 2V @ 20mA
    • 12V - 4V @ 20mA
    • 24V - 4V @ 20mA


  • Relay
    • 9V - 23mA
    • 12V - 25mA
    • 24V - 29mA
  • Min. Activation Voltage
    • 9V - 3.7V
    • 12V - 5.8V
    • 24V - 5.8V
  • Reset Voltage
    • 9V - 1.5V
    • 12V - 3.3V
    • 24V - 3.3V
  • Dry Contact Rating (type Form “C”)
    • 9V - <30V, 1A
    • 12V - <30V, 1A
    • 24V - <30V, 1A

Temperature Range

  • -40° to 120°F (-40° to 49°C)
  • For temperatures below -4°F (-20°C) recommend using remote power source


  • Three year guarantee against breakage of polycarbonate housing in normal use (one year on electro mechanical and electronic components).
  • Electronic warranty form at

STI-1100 Specifications PDF

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