Bosch B520 Auxiliary Power Supply Module

Brand: Bosch
Part Number: B520
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  • Color : Black
  • Environmental : Indoor
  • Output Voltage : 12VDC
  • Output Current : 2-4 A


Bosch B520 Auxiliary Power Supply Module

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. Industrial, commercial, and institutional facilities are typical installations for the B520 module. The B520 address switches allow for easy device addressing. The SDI2 Out terminals provide auxiliary power for SDI2 expansion devices, such as keypads. The AUX PWR terminals provides added auxiliary power capabilities for additional devices such as PIR motion detectors.

Key Features:

  • 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


Compatible products

Additional Information

Accessory Type:
Power Supply
Alternative SKUs:
114.3 x 176.2 x 29 mm (4.5 x 6.94 in x 1.15 in)
Manufacturer Website:
Operating Humidity:
5% to 95% RH
Operating Temperature:
0 °C to 50 °C (32 °F to 122 °F)
Output Current:
2-4 A
Output Voltage:
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