Bosch D125B User Manual
Fire Alarm Systems | D125B Dual Class B Initiating Module
D125B Dual Class B Initiating Module
www.boschsecurity.com
u Two separate powered detector loops
u Suitable for 12 VDC or 24 VDC, two‑wire or
four‑wire detectors
u Up to 50 two‑wire 12 VDC glass break detectors
u Reports individual loop alarm, individual loop
trouble, and ground fault
u Manually resets latching devices from control panel
or remote central station
The D125B has two separate NFPA Class B (Style B)
powered loops. The module supervises each of the
loops for opens, shorts, or ground faults. Both loops
can be powered with either 12 VDC or 24 VDC to
connect compatible two-wire detectors or other twoor four-wire devices such as retarded waterflow
switches, manual stations, heat detectors, or glass
break detectors.
The D125B is suitable for connecting fire or burglary
devices in commercial, industrial, and institutional
applications. Schools, offices, and health care facilities
are typical commercial applications.
Functions
Loop Supervision
The D125B needs to be electrically connected to earth
ground and to the control panel's common. The D125B
has a supervisory output terminal for each of its loops.
All terminal designations are clearly marked on the
module circuit board.
To supervise the loops, install an end-of-line (EOL)
resistor beyond the last detector of each protective
loop. If you are replacing a D125 or D125A Module
with the D125B, use the 1.5 k
(P/N: 15-03130-000) installed with the original system.
you are installing a D125B in a new system or are
If
Ω resistor
adding additional devices to an existing system, use
the 1.8 kΩ resistor (P/N: F01U009011) supplied with
the module.
The D125B shorts the protective loop on the control
panel when the high (+) and low (-) side of either
module loop is shorted together or when a smoke
detector activates. The D125B opens the protective
loop on the control panel during the following
conditions:
• Either of the module protective loops are opened.
• The D125B Interface module is unpowered.
• Either the high (+) side of the loop or the low (-) side
of the loop is shorted to ground.
With the D9412GV3, D7412GV3, D7212GV3,
D9412GV2, D7412GV2, D7212GV2, D9412G, D7412G,
and D7212G Control Panels, a short to ground causes
a ground fault condition when ground fault detect is
enabled.
When programming for fire applications, refer to the
appropriate control panel's operation and installation
guide.
Notice
Do not mix 12 VDC and 24 VDC detectors on the
same D125B Module.
2 | D125B Dual Class B Initiating Module
24 VDC Applications
An auxiliary power supply is used in 24 VDC
applications. The auxiliary power supply provides
power for the module and all devices connected to the
two loops.
Notice
The power supply is not provided with the unit.
Any power supply installed must be UL listed for
use with Bosch fire products.
The D130 Relay Module is used for 24 VDC
applications. CMD 47 is used to reset 24 VDC smoke
detectors. Refer to the control panel's operation and
installation guide.
Unpowered initiating devices such as waterflow
switches, manual stations, and heat detectors are
installed without the D130 Relay Module.
Certifications and approvals
Region Certification
USA UL AMCX: Central Station Alarm Units
(UL1610, UL1635), AMCX7: Central
Station Alarm Units Certified for Canada
(ANSI/UL 1635), AOTX: Local Alarm
Units (UL464, UL609), S525), APAW:
Police Station Alarm Units (UL365,
UL464), APAW7: Police-station-connected Alarm Units Certified for Canada
(CAN/ULC -S303, CAN/ULC-S304,
CAN/ULC-S525), APOU: Proprietary
Alarm Units (UL1076), NBSX: Household Burglar Alarm System Units
(UL1023), UOJZ: Control Units, System
(UL864, 9th edition), UTOU: Control
Units and Accessories - Household System Type (UL985)
FM
CSFM 7165-1615:0238
CSFM 7165-1615:0242
CSFM 7167-1615:0239
CSFM 7167-1615-0243
FDNY-
6059
CoA
NYC-
12-92-E, Vol. IV 12-92-E, Vol. IV
MEA
NYC-
12-92-E, Vol. 12 12-92-E, Vol. 12
MEA
NYC-
12-92-E, Vol. 15 12-92-E, Vol. 15
MEA
Installation/configuration notes
Compatible Products
The following products are compatible with the D125B
Dual Class B Initiating Module:
Category Product ID Product Description
Control
Panels
1
G-series
2
B-series
D94123,
D74123,
3
D7212
D9112B13,
D7212B1
3
D8112
3
Control panels
Control panels
Control panels
Control panels
Control panel
Detectors For a list of compatible two‑wire detectors, refer to the
D125B Installation Guide.
Enclosures D7103 Small enclosure (gray)
D8103 Universal enclosure (gray)
D8108A Attack-resistant enclosure (gray)
D8109 Fire enclosure (red)
Modules For a list of compatible modules, refer to the D125B
Installation Guide.
1
G-series = D9412GV4, D7412GV4, D7212GV4*, D9412GV3,
D7412GV3, D7212GV3*, D9412GV2, D7412GV2, D7212GV2*,
D9412G3, D7412G3, D7212G3*
2
B‑series = B5512 and B4512
3
These products are legacy products and have been investigated for
compatibility only to UL864 8th edition.
*
The D7212 models are not listed for commercial fire applications.
Mounting Considerations
The D125B module mounts in the Bosch control panel
enclosure using screws included with the unit. Use a
D137 Mounting Bracket to install additional modules
in the same enclosure, or when installing the D125B in
an approved adjacent enclosure. Separate enclosures
must be within 20 ft (6.1 m) of the control panel
enclosure and connected by conduit.
Wiring Considerations
Notice
When used in a fire system, NFPA 72 prohibits this
product from sharing a communications bus with
non-fire devices.
The D125B needs to be electrically connected to the
control panel's common terminal.
Parts included
Quant. Component
1 D125B module
2 1.8 kΩ EOL resistors (P/N: F01U009011)
1 Hardware pack
1 Literature pack
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