System Sensor RTS451KEY

Remote Test Station, Key Switch

  • Factory New
  • Material Obsolete
Brand: System Sensor Part #: 9981 Categories: , Manufacturer Part #: RTS451KEY


The System Sensor RTS451KEY(A) is an automatic fire detector accessory designed to test remotely located duct and beam detectors. For 4-wire detectors, the RTS451KEY features a multi-colored LED that alternates between steady green and red. Green indicates power and that the detector board is in place. Red indicates alarm. For 2-wire detectors, the LED will show red for alarm. Consult the detector installation instructions for additional information.

The National Fire Protection Association has published codes, standards, and recommended practices for the installation and use of this product. It is recommended that the installer be familiar with these requirements, with local codes, and any special requirements of the local authority having jurisdiction.


Weight 0.22 lbs
Dimensions 4.60 × 2.75 × 1.80 in



System Sensor



Production Status


Product Notes

Replacement: RTS151KEY

RTS451KEY(A) Remote Test Station

System Sensor - Installation Instructions

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