Cranford Controls

Stopper Range

Product Overview

The popular range of Stopper® units help to prevent malicious or accidental activation of fire alarm manual call point units. The Stopper® has been specifically designed to offer the maximum level of protection without restricting the legal operation of fire alarm devices. With a variety of models and IP ratings, the Stopper® range is ideal for use in schools, colleges, hospitals, nursing homes, hotels, public buildings and a wide variety of other properties, where there is a history or threat of unwanted activation of the fire alarm manual call points.

The stopper® range of products consists of a clear, tough, tamperproof polycarbonate cover, frame and optional deterrent sounder, which is designed to be easily retrofitted over existing or newly installed manual call point units. When the cover is lifted to operate the manual call point, the optional battery powered integral sounder emits a high-frequency sound at 95 dB(A). This draws immediate attention to the area, causing the perpetrator to leave or be apprehended. The devices are available in a wide range of colour options, to suit a variety of installation applications.


  • A wide variety of models to suit most applications
  • Available with or without integral deterrent sounder
  • Available with or without break seals for additional security
  • Custom labeling available
  • Language options available
  • IP 56 variant available
  • Sounder variants are powered by a 9V PP3 battery
  • Optional 12-24Vdc power input units on some variants

Part Numbers

308-184 STI 15C10ML Eurostopper Kit, No Sounder, Surface Mount
308-185 STI 15C20ML Eurostopper Kit, Sounder, Surface Mount
308-091 STI 13620FR Enviro Stopper® Unit, Red, Integral Sounder, Surface Mount
308-092 STI 13610FR Enviro Stopper® Unit, Red, No Sounder, Surface Mount
308-093 STI13620EG Enviro Stopper® Unit, Green, Integral Sounder, Surface Mount.
308-094 STI13610EG Enviro Stopper® Unit, Green, No Sounder, Surface Mount

All of STI’s range of Stopper products are available. For further information, please contact the Cranford Controls sales team.