Data Sheet

Fire Alarm Systems | D9142 Auxiliary Power Supplies
D9142 Auxiliary Power Supplies
www.boschsecurity.com
u Up to 4 A of power for charging batteries and
powering auxiliary or indicating devices
u Supervises batteries for low or missing conditions
u LED indicators for AC power and Trouble status
u Summary Trouble Relay
u Switched output control
The D9142F Auxiliary Power Supply is UL Listed, for
use in commercial fire alarm system applications. It
provides up to 4 A of power for charging batteries and
powering auxiliary or indicating devices.
The D9142F is provided either in its own red enclosure
(louvered for ventilation) or without the enclosure. A
green AC LED and a red Trouble LED are visible
through the enclosure door.
The enclosure also has room to install two 12 V, 7 Ah
batteries. Battery supervision is provided for both
batteries.
Power is supplied to the system through a D1601
Transformer. This specialized transformer provides
power to both the D9142F and to the control panel.
The D9142F supervises all critical circuits of the power
supply. It has several installation and service outputs
for troubleshooting. Five different trouble conditions
can be recognized and optionally communicated to a
central station. These trouble conditions are also
annunciated by on-board and off-board LED indicators.
A summary trouble relay can be programmed to give a
general trouble indication.
Functions
Auxiliary Devices
These devices are 4 A, 24 VDC power supplies with a
current-limited output for powering devices like smoke
detectors, bells, horns, strobes, or other 24 V devices.
Notice
Power-limited and non-power-limited wiring inside
the enclosure should be kept separate. Maintain
at least 0.25 in. (0.64 cm) spacing between all
field wiring and the AC and Battery harnesses. Be
sure to observe correct polarity when connecting
devices. For a list of compatible devices, see the
D9142F Compatibility List .
Battery Supervision
The power supply supervises the batteries for both
missing and low battery conditions.
Over-Current Protection
A 120 VAC fuse is located on the lower right-hand
corner of the power supply, above the 120 VAC
terminals. This fuse protects the D9142F and D1601
from damage due to power surges or overloads. The
fuse is a type 3 AG, 4 A, 250 VDC slow blow fuse (P/
N: 57‑01338‑004).