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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):
1 loop only: 75 mA maximum
Both loops:
145 mA maximum
Current (standby): 1 loop only: 12 mA maximum
Both loops: 24 mA maximum
Voltage (nominal) 12 VDC supplied by control panel or by
UL864 or UL1481 Listed 12 V power supply
Power Requirements (24 VDC Circuits)
Current (alarm):
1 loop only: 168 mA maximum
Both loops:
300 mA maximum
Current (standby): 1 loop only: 25 mA maximum
Both loops: 50 mA maximum
Voltage (nominal)
24 VDC supplied by UL864 or UL1481
Listed 24 V power supply
Two-wire Loop (Class B, Style B)_Characteristics
Current (alarm): 12 VDC: >11.8 mA
24 VDC: >24.1 mA
Current (trouble): 12 VDC: <3.5 mA
24 VDC: <7.5 mA
Detector Current: 12 VDC: 3 mA maximum
24 VDC: 7 mA maximum
Wiring Impedance:
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
3 | D125B Dual Class B Initiating Module