FB-CD Bases
FB-CD Series® Bases for Smoke & Heat Detectors
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 FB-CD Series bases are lockable.
The standard base is part number, 7254-FBD-4200. It contains no electronic parts which could be damaged during installation.
Relay Bases
Application
FB-CD Series® relay bases are primarily intended for use with control units using 4-wire detector supply and alarm initiating circuits. Where local codes allow, they may also be used in 2- and 4-wire circuits to provide volt-free control signals to an auxiliary system such as an automatic door closer.They are not suitable for use in systems where it is specified or required that operation of the auxiliary system shall be fail-safe and must not be used with any other type of detector.
The standard FB-CD Series® relay base, 7254-FBD-4255, provides one set of volt-free, changeover (form C) contacts that change state when the detector signals an alarm.
Auxiliary relay base,7254-FBD-4256, provides two sets of volt-free changeover contacts to facilitate the switching of a remote LED or other auxiliary device.
EOL (end-of-line) relay bases are intended foruse with 4-wire circuits and feature two sets of changeover contacts and a power supervision relay. Part numbers: 7254-FBD-4257, for circuits havinga supply voltage between 9 and 18 volts DC and 7254-FBD-4258 for circuits having a supply voltage between 16 and 33 volts DC.