Siemens HI121 Conventional Heat (135F) DetectorThe Siemens HI121 is a Conventional plug in Heat Detector. Alarm Temp: 135F (57C) COMPATIBLE BASES and ACCESSORIES: TM121 Test Magnet DB 11 Low Profile Surface Mount Base DB 11E Smaller Diameter Detector Base RR 11 Relay Module p n S54372 F3 A1
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