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
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