The Series 65 12V Relay Base is designed for use in both fire and security systems. For fire systems a jumper on the PCB is fitted to a 'latching' position. For security systems the jumper is moved to another position so that the base is non-latching.
The bases have been designed to enable detectors to be plugged in without any need for force - particularly useful when fitting to suspended ceilings. All Series 65 bases are lockable. The standard base is identical to the Series 60 base, so uses the same part number, 45681-200. It contains no electronic parts which could be damaged during installation.