• The B501BH-3 sounder base is used with Notifier intelligent detectors. Refer to the appropriate manual for more information on detectors.
• The B501BH-3 sounder base was designed specifically to meet the needs of dwelling unit applications. It offers maximum flexibility in configuration and operation to meet or exceed the requirements of FM3150.

• The sounder base is capable of producing either the distinctive three-pulse temporal pattern (ANSI Temporal 3) fire alarm signal now required by NFPA 72 for commercial and residential applications or a continuous tone by simply setting toggle switch from the device. Additionally, the B501BH-3 is designed to be compatible with existing installations of B200S(R) sounder bases.
• The sounder base is intended for use with intelligent systems. It requires an external 24VDC supply or communication loop power supply, which is set by using a DPDT slide switch. The sounder base is capable of sounding in high volume or low volume with or without gradient tone. Work-alone mode or synchronization mode is also settable. These functions can independently set by two toggle switches. Refer to the panel manual for maximum allowable number of units per loop.

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B501-BH-3 intelligent sounder base

• Base Diameter: 4.04” (10.26cm)
• Base Height (less detector): 1.495” (3.8cm)
• Operating Temperature Range: -4° to 120°F (-20° to 49°C)
• Operating Humidity Range: 10% to 93% relative humidity (non-condensing)

External Supply Electrical Ratings

• External Supply Voltage: 16 to 33VDC
• Standby Current: 110μA (Typical in 24VDC)
• Alarm Current: 35mA maximum

• FM Approval
• UL Approval