Data Sheet

Fire Alarm Systems | D370 Family Wall‑mount Door Holders
D370 Family Wall‑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 D370 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 for wall‑mounted applications
and can be flush‑mounted on standard single‑gang
back boxes or surface‑mounted on the D372B and
D372C back boxes. The D372 back boxes complement
the finish of the D370 electromagnet component that
mounts in them.
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 D370B (brass) and D370C (metallic
powder‑coat) holders through knockouts in the back
or the sides of the back boxes. The terminals accept
wires from 12 AWG to 22 AWG (ISO 4 mm
2
to
0.34 mm
2
).
Parts included
Quant. Component
1 Door magnet
1 Catch plate