Bosch Appliances Smoke Alarm D125B User Manual

Fire Alarm Systems | D125B Dual Class B Initiating Module  
D125B Dual Class B Initiating Module  
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 two-  
or 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.  
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.  
Functions  
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.  
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 kΩ resistor  
(P/N: 15-03130-000) installed with the original system.  
If you are installing a D125B in a new system or are  
Notice  
Do not mix 12 VDC and 24 VDC detectors on the  
same D125B Module.  
 
3 | D125B Dual Class B Initiating Module  
Technical specifications  
Mechanical Properties  
Dimensions  
(H x W x D):  
5 in. x 3 in. x 0.8 in.  
(12.7 cm x 7.6 cm x 2.0 cm)  
Power Requirements (12 VDC Circuits)  
Current (alarm):  
Current (standby):  
Voltage (nominal)  
1 loop only:  
Both loops:  
1 loop only:  
Both loops:  
75 mA maximum  
145 mA maximum  
12 mA maximum  
24 mA maximum  
12 VDC supplied by control panel or by  
UL864 or UL1481 Listed 12 V power supply  
Power Requirements (24 VDC Circuits)  
Current (alarm):  
Current (standby):  
Voltage (nominal)  
1 loop only:  
Both loops:  
1 loop only:  
Both loops:  
168 mA maximum  
300 mA maximum  
25 mA maximum  
50 mA maximum  
24 VDC supplied by UL864 or UL1481  
Listed 24 V power supply  
Two-wire Loop (Class B, Style B)_Characteristics  
Current (alarm):  
Current (trouble):  
Detector Current:  
Wiring Impedance:  
12 VDC:  
>11.8 mA  
24 VDC:  
>24.1 mA  
12 VDC:  
<3.5 mA  
24 VDC:  
<7.5 mA  
12 VDC:  
3 mA maximum  
7 mA maximum  
24 VDC:  
50 Ω maximum  
Ordering information  
D125B Dual Class B Initiating Module  
The module provides 2 Class B (Style B) powered  
loops for connecting 12 or 24 VDC, two- or four‑wire  
fire or burglary devices or up to 50 two‑wire 12 VDC  
glass break detectors. It reports individual loop alarm  
or trouble and ground fault; and allows latching device  
reset from panel or central station.  
Order number D125B  
Accessories  
D137 Mounting Bracket  
Used to mount accessory modules in D8103, D8108A,  
and D8109 enclosures.  
Order number D137  
 
4 | D125B Dual Class B Initiating Module  
Represented by:  
Americas:  
Europe, Middle East, Africa:  
Bosch Security Systems B.V.  
P.O. Box 80002  
5617 BA Eindhoven, The Netherlands  
Phone: + 31 40 2577 284  
Fax: +31 40 2577 330  
Asia-Pacific:  
Robert Bosch (SEA) Pte Ltd, Security  
Systems  
11 Bishan Street 21  
Singapore 573943  
Phone: +65 6571 2808  
Fax: +65 6571 2699  
China:  
America Latina:  
Bosch Security Systems, Inc.  
130 Perinton Parkway  
Fairport, New York, 14450, USA  
Phone: +1 800 289 0096  
Fax: +1 585 223 9180  
Bosch (Shanghai) Security Systems Ltd. Robert Bosch Ltda Security Systems Division  
201 Building, No. 333 Fuquan Road  
North IBP  
Changning District, Shanghai  
200335 China  
Phone +86 21 22181111  
Fax: +86 21 22182398  
Via Anhanguera, Km 98  
CEP 13065-900  
Campinas, Sao Paulo, Brazil  
Phone: +55 19 2103 2860  
Fax: +55 19 2103 2862  
© Bosch Security Systems 2013 | Data subject to change without notice  
2691432971 | en, V2, 06. Aug 2013  
 

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