The modules provide a supervised polarity reversal output used for audible and visual signaling devices or to trigger a remote NAC power expander. They require a 24 VDC auxiliary input voltage that can be provided by the FPA‐1000 Analog Addressable Fire Panels or other UL listed power supplies. The modules provide a Class B Circuit rated for 2 A at 24 VDC. They fit into a standard 4‐inch square or double‐gang electrical back box.