Bosch B520 Specsheet

Intrusion Alarm Systems | B520 Auxiliary Power Supply Module

B520 Auxiliary Power Supply Module

www.boschsecurity.com

u Provides up to 2A of 12V standby current for Fire or

Burglar Applications (4A of Burglary alarm current)

u Supervises up to two 12v 7-18Ah batteries

independently for up to 36AH of capacity

The B520 Auxiliary Power Supply Module is a fully
supervised, addressable SDI2 bus device that provides
an integrated auxiliary power supply solution for
Bosch control panels.

System overview

The B520 Auxiliary Power Supply Module is an
auxiliary power supply expansion device that connects
to compatible control panels through the SDI2 bus.
This module is supervised and communicates back to
the control panel all status changes.
Industrial, commercial, and institutional facilities are
typical installations for the B520 module. The B520
rotary switches allow for ease of use in device
addressing. The SDI2 Out terminals provide auxiliary
power for SDI2 expansion devices such as keypads.
The AUX PWR terminals provides added auxiliary
power capabilities for additional devices such as PIR’s.

Functions

Supervision Monitoring

The module monitors and communicates status
information over the SDI2 bus for the following:

• Operation (Heartbeat)

• Battery 1 (BATT 1)

• Battery 2 (BATT 2)

• AC input power (AC)

u Provides up to 80 hours of standby time

u Uses the Bosch standard TR1850 plug-in

transformer

u Easy to read rotary switch addressing

• Battery OK

• Low Battery

• Missing Battery

Indicators

• Heartbeat [icon]: Blue LED flashing On and Off when
system is operating normally. A steady On or Off LED
indicates a system error. Triple flash indicates
communication failure.

• BATT 1 LED: Green steady On LED indicates the
battery status of BATT 1 is operating normally.
Flashing indicates low battery. Triple flash indicates
battery charger failure. Off LED indicates a missing
battery.

• BATT 2 LED: Green steady On LED indicates the
battery status of BATT 2 is operating normally.
Flashing indicates low battery. Triple flash indicates
battery charger failure. Off LED indicates a missing
battery.

• AC LED: Green steady On LED indicates the AC
power is operational. A pulsating LED (3 pulses per
sec.) occurs when a battery test is being performed.
Flashing indicates low or failed AC.

Battery Charging

Fully charged batteries, connected to the battery
terminals, sustain power to the B520 in the event that
the AC power fails.

2 | B520 Auxiliary Power Supply Module

If AC power fails (is absent, or low) on the B520, the
B520 automatically switches from primary power (AC)
to secondary power (battery). When AC power is
present, the B520 performs periodic battery tests to
ensure battery life and usability.

Certifications and approvals

Region

US UL 365 ￚ Police Station Connected Burglar

Alarm Units and Systems

UL 609 ￚ Local Burglar Alarm Units and
Systems

UL 636 ￚ Holdup Alarm Units and Systems

UL 864 ￚ Control Units and Accessories for
Fire Alarm Systems

UL 985 ￚ Household Fire Warning System
Units

UL 1023 ￚ Household Burglar Alarm System
Units

UL 1076 ￚ Proprietary Burglar Alarm Units and
Systems

UL 1610 ￚ Central Station Burglar Alarm Units

FCC Part 15 Class B

Canada CAN/ULC S303 ￚ Local Burglar Alarm Units

and Systems

CAN/ULC S304 ￚ Signal Receiving Centre and
Premise Alarm Control Units

ULC-ORD C1023 ￚ Household Burglar Alarm
System Units

ULC-ORD C1076 ￚ Propriety Burglar Alarm
Units and Systems

ICES-003 ￚ Digital Apparatus

Region Certification

USA UL 20121010-S5579

CSFM see our website

Installation/configuration notes

Mounting Considerations

You can mount the B520 Auxiliary Power Supply
Module in a variety of enclosures for optimal
situations.
Mounting in the D8103 requires the addition on the
B12 Mounting plate.
The D8103 enclosure supports up to two 12V, 18Ah
batteries. The B10 supports either one 12V, 18Ah or
up to two 12V, 7Ah batteries.

Wiring Considerations

The B520 connects to a control panel using the SDI2
IN connections (PWR, A, B, COM). Use 12 AWG to
22 AWG (1.5 mm to 0.6 mm) wires from the power
supply to the control panel.
The B520 provides auxiliary power to expansion
modules via the SDI2 OUT (PWR, A, B, COM), or AUX
Power (AUX PWR) connections using the screw
terminal strip, or by using the interconnect wiring
connection. Use 12 AWG to 22 AWG (1.5 mm to

0.6 mm) wires from the module to the SDI2 expansion
module(s).

Parts included

Quantity Component

1 B520 Auxiliary Power Supply module

1 Hardware pack

1 Literature pack

B520 Kit, B10 Enclosure

Kit contents include:

• B520 Aux Power Supply

• TR1850 transformer

• B10 white enclosure

Order number: B520-B

B520 Kit, D8103 Enclosure

Kit contents include:

• B520 Aux Power Supply

• TR1850 transformer

• B12 mounting plate

• D8103 gray, steel enclosure

Order number: B520-C

Technical specifications

Properties

Board Dimensions 11.43 cm x 17.62 cm x 2.9 cm

Maximum Distance – Wire
Size

Compatibility GV4 Series control panels (Up to 8

(4.5 in x 6.94 in x 1.15 in)

305 m (1000 ft) - 0.65 mm (22
AWG)
305 m (1000 ft) – 2 mm (18 AWG)
Unshielded wire only

B520 Auxiliary Power Supply
Modules per control panel)
D8103 Enclosure
B10 Large Control Panel Enclosure
B12 Mounting Plate for the D8103
Enclosure
D8108A Attack Enclosure
D2203 Enclosure
BATB-40 Enclosure
AE1, AE2 Enclosures
D8004 Transformer Enclosure*

B501-10 Interconnect cables (10 per pack)