D125B Initiating module, dual class B, 12/24V

D125B Initiating module, dual class B, 12/24V

  • Two separate powered detector loops
  • Suitable for 12 VDC or 24 VDC, two‑wire or four‑wire detectors
  • Up to 50 two‑wire 12 VDC glass break detectors
  • Reports individual loop alarm, individual loop trouble, and ground fault
  • 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.

 
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)
   
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
   
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
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