Fully compliant with BS 5839 Part 4.
Lift-off lid for easy first fix and maintenance.
Robust metal lid and metal back box with heavy-duty base connections.
Built-in 24V power supply and battery charger.
Optional head removal monitoring facility.
True three wire operation of sounder and detector circuits (Ov is common) for considerable cost savings on installation.
Separate indicators for open and short circuit fault, sounder fault and battery/power supply fault.
Non-latching ‘class change’ sounder input, latching fire and non-latching fault outputs (available via optional expansion loom).
Fault buzzer mute facility.
Space available for the rated capacity of VRLA batteries.
Short circuit = fire facility (pre-1980 BS, no resistors in call points), selectable on a zone by zone basis - ideal for retro-installations.
True battery monitoring circuit.