Bosch Security B520


The B520 Auxiliary Power Supply Module is an auxiliary power supply expansion device that connects to compatible control panels through the SDI2 bus. This module is supervised and communicates all status changes to the control panel.

Lead Time: 6-8 Business Days

  • Factory New
Brand: Bosch Security Part #: 55289 Categories: , Manufacturer Part #: B520 Tags: , ,


  • Provides up to 2 A of 12 V standby current for Fire or Burglar Applications (4 A of Burglary alarm current)
  • Supervises up to two 12 V 7-18 Ah batteries independently for up to 36 Ah of capacity
  • Provides up to 80 hours of standby time
  • Easy-to-read switch addressing
  • Uses the Bosch standard TR1850 plug-in transformer


Weight 1.00 lbs



B520 Auxiliary power supply module, 2A 12V
Bosch Security – Data Sheet
Auxiliary Power Supply Module B520
Installation Manual


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