Bosch Security D125B


Powered loop interface

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  • Factory New
Brand: Bosch Security Part #: B04A-5018 Category: Manufacturer Part #: D125B


The D125B has two separate NFPA Class 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.


Weight 0.5 lbs
Dimensions 0.80 × 3.00 × 5.00 in



Bosch Security

Production Status



  • 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


D125B Powered loop interface
Bosch Security – Data Sheet – 2020
Powered loop interface; D125B
Bosch Security – Installation Instructions – 2018

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