Data Sheet

Fire Alarm Systems | D371 Family Floor‑mount Door Holders
D371 Family Floor‑mount Door Holders
www.boschsecurity.com
u Attractive design, sturdy cast construction with
brass (B) or metallic powder‑coat (C) finish
u 24 VAC, 24 VDC, or 120 VAC
u 12 AWG (ISO 4 mm
2
) to 22 AWG (ISO 0.34 mm
2
)
terminals
u Holding force between 35 lb and 110 lb
u A variety of available extension rods allow mounting
in difficult locations
The D371 electromagnetic door holders are rugged
die‑cast devices for holding doors. They allow control
of doorways in alarm conditions. Typical applications
are in stairways or other exit pathways where it is
desirable to restrict airflow yet allow free emergency
access.
Functions
Power and Holding Force
These door holders accept power from 24 VAC,
24 VDC, or 120 VAC sources. Depending on how they
are wired and the amount of current, they can supply
from 35 lb to 110 lb of holding force.
Certifications and approvals
Region Certification
USA UL SZNT: Releasing Devices, Ordinary Loca-
tions (UL864)
CSFM see our website
Hong Kong HKFSD
Installation/configuration notes
Mounting Considerations
These door holders are floor‑mounted units, complete
with back box and bracket and all fasteners needed
for standard installation.
Extension rods are available in lengths from 1 in.
(2.5 cm) to 4 in. (10 cm) to allow installation in
applications where the door does not swing to within
3 in. (7.5 cm) of the back box.
Wiring Considerations
Wire the D371B (brass) and D371C (metallic
powder‑coat) door holders through knockouts in the
bottom or the sides of the back boxes. The D371 back
box also has knockouts for conduit installation other
than from the bottom. The terminals accept wires from
12 AWG to 22 AWG (ISO 4 mm
2
to 0.34 mm
2
).
Parts included
Quant. Component
1 Back box bracket
1 Door magnet
1 Catch plate