Siemens (OP121) Photoelectric Smoke Detector – S54372-F1-A1


SKU: OP121

A conventional smoke detector that uses state-of-the-art microcontroller circuitry and surface-mount technology for maximum reliability

Siemens (OP121) Photoelectric Smoke Detector – S54372-F1-A1

The Siemens OP121 is a photoelectric smoke detector with microprocessor-controlled, self-diagnostic circuitry, eliminating the need for burdensome sensitivity test equipment.  The OP121 also comes with a new magnet-test feature.  The magnet-test feature allows installers and test personnel to prove the integrity of the wiring and proper connection to the fire alarm control panel (FACP).

At Life Safety Consultants, we strive to only offer high-quality products when it comes to smoke detector replacement parts. That’s why we’re proud to introduce the Siemens Conventional Photoelectric Smoke Detector OP121 ( Siemens part#S54372-F1-A1).

The Siemens OP121 detectors can be used as a replacement to the discontinued Siemens DI-3 Ionization detector.  When replacing, a new DB-11 base would be required. 

Order yours today and browse our website to learn more about our Siemens parts and accessories.

For more details, get in touch with the Life Safety Consultants team at  (888) 557-0558 or email us at

Additional information

Weight .2 lbs
Dimensions 4 × 4 × 2 in


Part Type

Photoelectric, Smoke Detector



You may also like…