The Bosch B520 Auxiliary Power Supply Module is a robust, supervised 12V DC power expansion solution designed to meet the demanding requirements of modern intrusion and fire alarm systems. Delivering up to 2A of continuous auxiliary power and 4A of burglary alarm current, it ensures uninterrupted performance for peripheral devices like motion detectors, keypads, and SDI2 modules. It supports up to two 12V sealed lead-acid batteries (7-18Ah each), offering a combined standby capacity of up to 36Ah and up to 80 hours of battery-backed power. Engineered for seamless integration with Bosch's Solution 4000 and a broad range of B and D series control panels, the B520 is ideal for commercial, industrial, and institutional security applications.

What's Included:

• Bosch B520 Auxiliary Power Supply Module

• Installation hardware pack

• User/Installer manual

Main Features:

• Supplies up to 2A of auxiliary 12V DC power and 4A alarm current

• Supports two independently supervised 12V batteries (7–18Ah)

• Monitors AC input, battery presence, charge level, and faults

• Compatible with SDI2 devices and Bosch security panels

• Easy addressing via DIP switches

• 80-hour maximum battery standby time

• Heartbeat, battery, and AC status LEDs for system diagnostics

• Compatible with TR1850 transformer (18VAC, 50VA)

• UL listed and CE certified

Detailed Specifications:

• Part Number: B520

• Dimensions: 11.43 cm x 17.62 cm x 2.9 cm

• Input Power: 18VAC, 50VA

• Output Power: 2A continuous (up to 4A for burglar alarm current)

• Battery Charging Reserve: 150mA

• Voltage Range: 11.5V – 12.2V DC

• Max Battery Support: Two 12V sealed lead-acid batteries, 7-18Ah each (up to 36Ah total)

• Current Draw (from control panel): 15mA

• Operating Temperature: 0°C to +49°C

• Storage Temperature: -20°C to +60°C

• Humidity: 5% to 93% non-condensing at 32°C

• Mounting Options: B8103, D8103, B10, D8108A, AE1/AE2, BATB-40

• Compatible Transformers: TR1850 (North America), TR1850-CA (Canada)

Warranty Information:
Bosch offers a standard 3-year return-to-base warranty on the B520 module. Warranty covers manufacturing defects and hardware failure under normal operating conditions.

Brand Description:
Bosch Security Systems is a global pioneer in reliable, innovative security and life safety technology. Their extensive range of intrusion detection, fire safety, and access control systems are engineered for durability and high performance, trusted in critical installations worldwide.

SKU: B520

Practical Use Scenarios:

• Supplementing auxiliary power in large-scale Bosch intrusion/fire alarm systems

• Extending power supply to additional keypads, PIRs, and SDI2 devices

• Providing battery-backed power in power outage-prone environments

• Supporting fire safety installations requiring UL 864 compliance

• Industrial and institutional environments with multiple expansion modules

Datasheets and Downloadable Resources:

• • Download Datasheet
  • Download Installation Manual

Excellence for the Australian and New Zealand Market:
The Bosch B520 Auxiliary Power Supply Module is engineered to meet stringent Australian and New Zealand electrical and safety standards. Fully compatible with Bosch’s authorized regional panel offerings, it is sourced exclusively through Bosch’s certified channels. All warranty claims and technical support are handled locally by Bosch representatives, ensuring seamless service. The module’s rugged design and broad compatibility make it a reliable addition to security infrastructure across commercial and government sectors in Australia and New Zealand.

Frequently Asked Questions (FAQs):

Q1: Can the Bosch B520 (B520) be used with the Solution 4000 control panel?
A1: Yes, the B520 is fully compatible with the Bosch Solution 4000, providing auxiliary power and communication through the SDI2 bus.

Q2: What is the maximum backup battery capacity supported by the B520 (B520)?
A2: The B520 supports up to two 12V batteries ranging from 7Ah to 18Ah each, providing a total backup capacity of up to 36Ah.

Q3: Does the B520 (B520) include monitoring for AC and battery faults?
A3: Yes, the module monitors AC power, battery presence, charge status, and faults. LED indicators display heartbeat, AC, and battery status.

Q4: What enclosures are recommended for installing the Bosch B520 (B520)?
A4: The B520 can be installed in Bosch enclosures including the B10, B8103, D8103, and D8108A. The B12 mounting plate is recommended for secure installation in some enclosures.

Q5: What power supply transformer is required for the B520 (B520)?
A5: The B520 is designed for use with the Bosch TR1850 (18VAC, 50VA) plug-in transformer. In fire system applications, the D8004 transformer enclosure may be required