B401BH

Models B401BH and B401BHA sounder bases are intended for use with System Sensor 400 Series plug-in sensor heads in conventional 2-wire plug-in systems. Refer to systems manuals for the maximum allowable number of units per loop. The B401BH requires an external 24VDC (nominal) supply with reverse polarity capability. The connections of the external supply (terminals 1 and 2) and the initiating loop (terminals 3, 4, and 5) are isolated in the B401BH to prevent electrical interaction between them.

When the B401BH and B401BHA detector head's visible LEDs are latched on for approximately 10 seconds, the associated horn sounds. A loop of horns can be made to sound by reversing the polarity of the external supply.

NOTE: When the associated system is NOT used as a supplementary evacuation system, the external 24VDC supply must be treated as a component of the main power supply system with the result that it falls under the requirements of NFPA 72.