Bosch B520-C Auxiliary Power SDI2 Supply Kit, Includes TR1850, D8103, B12, B520

Ensure uninterrupted protection for your facility with the Bosch B520-C auxiliary power supply kit — designed to deliver reliable, supervised power to fire, burglar and access control systems. This Bosch power supply kit provides up to 2 A of 12 V standby current (and 4 A for burglary alarm output) and maintains system voltage between 11.50–12.20 V DC to keep sensors, keypads and communicators functioning during power events.

Engineered for commercial and institutional security installations, the B520-C supports two 12 V 7–18 Ah batteries independently (up to 36 Ah) and can offer up to 80 hours of standby time, reducing false trouble reports and costly service calls. Supervised SDI2 communication continuously reports AC status, battery health and device operation back to the control panel for improved monitoring and faster diagnostics. Installation is streamlined with the Bosch TR1850 plug-in transformer and simple address switches, saving time on-site.

Ideal for surveillance, alarm and monitoring applications, the B520-C delivers a dependable, service-friendly power foundation. Order the Bosch B520-C today to safeguard uptime and simplify maintenance for your security systems.

• Keeps security and surveillance systems online with supervised 12 V auxiliary power, providing up to 2 A standby and 4 A alarm output
• Provides extended backup with independent support for two 12 V 7–18 Ah batteries (up to 36 Ah) and up to 80 hours standby for critical monitoring
• SDI2 supervision reports AC, battery and device status to the control panel for proactive maintenance and reduced false alarms
• Quick installation with Bosch TR1850 plug-in transformer and easy-to-read address switches to minimize technician time and system downtime
• Flexible AUX and SDI2 outputs power keypads, PIR detectors and access control devices for seamless integration with fire, burglar and access control systems