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Home --> System Sensor
S300 Relay bases-00
  • General
  • Feature
  • Specification

The B501 is a plug in detector base intended for use in an
intelligent system with screw terminals provided for power
(+) and (–), and remote annunciator connections. The
communication takes place over the power (+) and (–)



Diameter: 4.0 inches (10.2cm)


Mounting: 50mm, 60mm, and 70mm centers


Electrical Ratings – includes base and detector


Voltage Range: 15-32 VDC


Standby Current (nominal): 150μA at 24 VDC


Power-Up Surge at

Maximum Rated Voltage: 1.5mA–Sec.


LED Current (nominal): 6mA at 24 VDC


Operating Temperature Range: 32° to 150°F (0° to 66°C)