Bosch Auxiliary Power Supply Module, B520
SKU
B520
Model No
B520
$235.01
Product Highlights
- Provides up to 2A of 12V standby current for Fire or Burglar Applications (4A of Burglary alarm current)
- Supervises up to two 12v 7-18Ah batteries independently for up to 36AH of capacity
- Provides up to 80 hours of standby time
- Uses the Bosch standard TR1850 plug-in transformer
- Easy to read rotary switch addressing

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The B520 Auxiliary Power Supply Module is engineered for reliability and efficiency, offering a robust power solution for Bosch control panels. This fully supervised, addressable SDI2 bus device provides up to 2A of standby current, making it ideal for fire and burglary applications while ensuring independent supervision of connected batteries for enhanced safety. The integration of rotary switch addressing simplifies installation and configuration, ensuring that the B520 module meets the demands of industrial, commercial, and institutional facilities with ease.
Bosch B520 Auxiliary Power Supply Module Features
- Power Supply Capacity: Provides up to 2A of 12V standby current for Fire or Burglar Applications (4A of Burglary alarm current), ensuring your system has adequate power during critical situations.
- Battery Supervision: Supervises up to two 12V 7-18Ah batteries independently for up to 36AH of capacity, enhancing the reliability of your power supply.
- Standby Time: Provides up to 80 hours of standby time, ensuring operational continuity during power outages.
- Transformer Compatibility: Uses the Bosch standard TR1850 plug-in transformer, making it compatible with existing Bosch equipment.
- Easy Addressing: Easy to read rotary switch addressing simplifies the installation process and enhances user experience.
Bosch B520 Auxiliary Power Supply Module Specifications
| Model | B520 Auxiliary Power Supply Module |
| Type | SDI2 Bus Device |
| Standby Current | 2A at 12V |
| Burglary Alarm Current | 4A |
| Battery Supervision | Up to two 12V 7-18Ah batteries |
| Standby Time | Up to 80 hours |
| Transformer Type | Bosch TR1850 |
| Installation Type | Easy rotary switch addressing |
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