Bosch B520 Auxiliary Power Supply Module 2A, 12V

Keep critical security and monitoring equipment powered and supervised with the Bosch B520 auxiliary power supply module. This Bosch power supply module provides dependable 12V DC output with up to 2 A of standby current (and up to 4 A of burglary alarm current) so keypads, sensors and other surveillance devices remain operational during power events. The B520 independently supervises up to two 7–18 Ah batteries—supporting up to 36 Ah total—so system owners get predictable backup runtime and easier battery management.

Designed for commercial and industrial alarm systems, the B520 connects via the SDI2 bus and communicates status changes back to the control panel for centralized monitoring. Installer-friendly rotary addressing and compact dimensions make it simple to add auxiliary power where you need it, and the module is compatible with a wide range of Bosch enclosures and GV4 control panels.

Ideal for security integrators specifying reliable auxiliary power for surveillance, fire or intrusion systems. Add the Bosch B520 to your next installation to improve uptime and streamline maintenance—contact your distributor or order today.

• Delivers dependable 12V auxiliary power to keep security and surveillance devices online during power events
• Supervises dual batteries (up to 36 Ah total) to ensure reliable backup and predictable runtime for alarm systems
• Easy rotary addressing and SDI2 bus connectivity simplify installation and system expansion in commercial environments
• Built-in supervision reports status changes back to the control panel for proactive monitoring and maintenance
• Compact, enclosure-compatible design supports multiple modules per panel for scalable security deployments