Simplex 565-654 Duct Detector Card (With Relay)The Simplex 565 654 duct detector card is an internal replacement electronics board for the Simplex 4098 9751 TrueAlarm in duct sensor housing with relay. It serves as the housings interface board, linking the sensor head base assembly to system wiring and supporting the relay housing functions when the enclosure and field wiring are being reused. Key Specifications: Type: Internal duct detector interface card (replacement electronics) Core
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