Siemens OH121


Detector Combo PE/Heat Conv

Availability: Estimated 12 days

Condition: New
Brand: Siemens
Status: Active
SKU: 72156
Manufacturer Part #: OH121
Secondary Part #: S54372-F2-A1


Model OH121 from Siemens Industry ─ Fire Safety is a photo / thermal smoke detector that contains a thermal sensor. When the sensor is utilized, an Alarm condition will trigger when the temperature reaches 135°F ─ at this point, the detector will also lock into Alarm condition. The magnet-test feature allows for Model OH121 to be tested without the use of a heat gun, providing quick testing for installers and test personnel to prove the integrity of the wiring and proper connection to the fire alarm control panel (FACP).

Additional information

Weight 0.48 lbs

Siemens Industry, Inc.




Unit of Measurement

EA (Each)

Production Status



  • State-of-the-art, smoke-detection chamber that yields quick response
  • Incorporates one (1) state-of-the-art chamber for rapid, uniform response to alarm criteria (i.e. ─ heat, smoke)
  • Magnet-test feature
  • Automatic sensitivity test without the need for a special tester (per NFPA 72)
  • Available optional sounder base, providing an alert and evacuation signal
  • UL 268 Listed, ULC S529 Listed; FM, CSFM Approved


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Photo Thermal Smoke Detector; Model OH121


Siemens – Data Sheet