Extra Standby Power
Provides up to 2A of 12V standby current (4A burglary alarm current) for larger systems.
Dual Battery Monitoring
Independently supervises two 12V 7–18Ah batteries for up to 36Ah and around 80 hours standby.
SDI2 Integration
Connects on the SDI2 bus with easy-to-read switch addressing for straightforward setup.
Standard Transformer
Uses the common Bosch TR1850 plug-in transformer for simple, familiar installation.
Which panels is the B520 for?
It is an auxiliary power supply module for Bosch G-Series control panels, connecting via the SDI2 bus.
How much current does it supply?
Up to 2A of 12V standby current, or 4A of burglary alarm current, for powering additional devices.
How many batteries can it monitor?
It independently supervises up to two 12V 7–18Ah batteries for a combined capacity of up to 36Ah.
What transformer does it use?
The standard Bosch TR1850 plug-in transformer supplies the module with 18V AC.
Can it be used for fire applications?
Yes. It provides supervised standby power suitable for both fire and burglary applications.
What's in the box?
The B520 power supply module PCB. Batteries, transformer and enclosure are supplied separately.
