BOSCH B520 Auxiliary Power Supply Module, 2A 12V - Used

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This used power supply module will ship insured and inspected from Rapid City, SD. This unit is like new, with the manual and materials included.

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The Bosch B520 Auxiliary Power Supply Module is a dependable and efficient solution designed to extend the power capabilities of Bosch control panels. Delivering up to 2A of 12V standby current (or 4A in alarm for burglary systems), it provides reliable performance for both fire and security applications. This fully supervised SDI2 bus device monitors up to two connected batteries independently, ensuring continuous safety and up to 80 hours of standby power. With its rugged design and advanced supervision, the B520 is built to meet the high standards of industrial, commercial, and institutional environments.

Installation is made simple through rotary switch addressing, which allows quick setup and configuration without unnecessary complexity. Compatible with Bosch’s standard TR1850 plug-in transformer, the B520 integrates seamlessly into existing systems while expanding power capacity up to 36AH. Whether supporting mission-critical security or fire protection systems, this auxiliary power module ensures reliable operation when it’s needed most.

Features / Specs

• Type: SDI2 Bus Device
• Standby Current: 2A at 12V
• Battery Supervision: Up to two 12V 7-18Ah batteries
• Transformer: Bosch TR1850
• Installation: Easy rotary switch addressing

Dimensions

• Width: 7 in
• Height: 4.5 in
• Depth: 1.5 in (at tallest)