Bosch D371B, D371C Specsheet
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
terminals
2
) to 22 AWG (ISO 0.34 mm2)
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
u Holding force between 35 lb and 110 lb
u A variety of available extension rods allow mounting
in difficult locations
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 mm2 to 0.34 mm2).
Parts included
Quant. Component
1 Back box bracket
1 Door magnet
1 Catch plate
2 | D371 Family Floor‑mount Door Holders
1 Nut plate
1 Mounting template
2 Drill bits
2 Black plastic caps
1 Hardware pack
1 Literature pack
Technical specifications
Electrical
Current Draw (24 V installations)
24 VAC: 19 mA
24 VDC: 20 mA
Current Draw (120 V installations)
Common and High
Voltage Terminals:
Common and Low
Voltage Terminals:
Voltage (supply): 24 VAC, 24 VDC, or 120 VAC
20 mA
100 mA
Environmental
Relative Humidity: Up to 95%, non‑condensing
Temperature (operating): +32°F to +120°F (0°C to +49°C)
Mechanical
Dimensions
Catch Plate (diameter x depth)1: 2.25 in. x 2.25 in.
Electromagnet (H x W x D)2: 2.75 in. x 4.625 in. x 2 in.
Floor Bracket (H x W x D): 3.875 in. x 4.75 in. x 2.75 in.
D372 Back Box (H x W x D): 2.75 in. x 4.75 in. x 1.5 in.
1
The diameter of the magnet plate is 1.75 in. (4.4 cm).
2
The electromagnet component extends 0.875 in
(5.7 cm x 5.7 cm)
(7 cm x 11.7 cm x 5.1 cm)
(9.8 cm x 12.1 cm x 7 cm)
(7 cm x 12.1 cm x 3.8 cm)
(2.2 cm) from the mounting surface when surface
mounted. It extends 1.125 in. (2.9 cm) into the back
box.
Ordering information
D371B Floor‑Mount Door Holder with Brass Finish
Door holder with brass finish accepts power from
24 VAC, 24 VDC, or 120 VAC sources and, depending
on wiring and current, can supply from 35 lb to 110 lb
of holding force
Order number D371B
D371C Floor‑Mount Door Holder with Metallic Powder‑coat Finish
Door holder with metallic powder‑coat finish accepts
power from 24 VAC, 24 VDC, or 120 VAC sources and,
depending on wiring and current, can supply from
35 lb to 110 lb of holding force
Order number D371C
D373B Extension Rod (brass, 2.5 cm [1 in.])
2.5 cm (1 in.) extension rod with brass finish; package
of five
Order number D373B
D373C Extension Rod (metallic powder‑coat, 2.5 cm
[1 in.])
2.5 cm (1 in.) extension rod with metallic powder‑coat
finish; package of five
Order number D373C
D374B Extension Rod (brass, 3.8 cm [1.5 in.])
3.8 cm (1.5 in.) extension rod with brass finish;
package of five
Order number D374B
D374C Extension Rod (metallic powder‑coat, 3.8 cm
[1.5 in.])
3.8 cm (1.5 in.) extension rod with metalliic
powder‑coat finish.; package of five
Order number D374C
D375B Extension Rod (brass, 5.1 cm [2 in.])
5.1 cm (2 in.) extension rod with brass finish; package
of five
Order number D375B
D375C Extension Rod (metallic powder‑coat, 5.1 cm
[2 in.])
5.1 cm (2 in.) extension rod with metallic powder‑coat
finish; package of five
Order number D375C
D376B Extension Rod (brass, 7.6 cm [3 in.])
7.6 cm (3 in.) extension rod with brass finish; package
of five
Order number D376B
D376C Extension Rod (metallic powder‑coat, 7.6 cm
[3 in.])
7.6 cm (3 in.) extension rod with metallic powder‑coat
finish; package of five
Order number D376C
D377B Extension Rod (brass, 10.2 cm [4 in.])
10.2 cm (4 in.) extension rod with brass finish;
package of five
Order number D377B
D377C Extension Rod (metallic powder‑coat, 10.2 cm
[4 in.])
10.2 cm (4 in.) extension rod with metallic
powder‑coat finish; package of five
Order number D377C
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