Bosch D370B, D370C Specsheet

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

terminals

2

) to 22 AWG (ISO 0.34 mm2)

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

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 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 mm2 to

0.34 mm2).

Parts included

Quant. Component

1 Door magnet

1 Catch plate

2 | D370 Family Wall‑mount Door Holders

1 Nut plate

1 Mounting template

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

D372B Surface‑mount Back Box (brass)

Brass‑plated metal surface‑mount back box

Order number D372B

D372C Surface‑mount Back Box (metallic powder‑coat)

metal surface‑mount back box with metallic
powder‑coat finish

Order number D372C

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

Dimensions

Catch Plate (diameter x depth)1: 2.25 in. x 2.25 in.

Electromagnet (H x W x D)2: 4.625 in. x 2.75 in. x 2 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)

(11.7 cm x 7 cm x 5.1 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

D370B Wall‑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 D370B

D370C Wall‑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 D370C

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

3 | D370 Family Wall‑mount Door Holders

Represented by:

Americas: Europe, Middle East, Africa: Asia-Pacific: China: America Latina:

Bosch Security Systems, Inc.
130 Perinton Parkway
Fairport, New York, 14450, USA
Phone: [phone]
Fax: [phone]
[e-mail]
www.boschsecurity.us

Bosch Security Systems B.V.
P.O. Box 80002
5617 BA Eindhoven, The Netherlands
Phone: + 31 40 2577 284
Fax: [phone]
[e-mail]
www.boschsecurity.com

Robert Bosch (SEA) Pte Ltd, Security
Systems
11 Bishan Street 21
Singapore 573943
Phone: [phone]
Fax: [phone]
[e-mail]
www.boschsecurity.asia

Bosch (Shanghai) Security Systems Ltd.
201 Building, No. 333 Fuquan Road
North IBP
Changning District, Shanghai
200335 China
Phone [phone]
Fax: [phone]
www.boschsecurity.com.cn

Robert Bosch Ltda Security Systems Division
Via Anhanguera, Km 98
CEP 13065-900
Campinas, Sao Paulo, Brazil
Phone: [phone]
Fax: [phone]
[e-mail]
www.boschsecurity.com

© Bosch Security Systems 2014 | Data subject to change without notice
2737136651 | en, V3, 05. Sep 2014

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

D378 Extension Rod Wrench Kit

Wrench kit for installing extension rods and door
holders

Order number D378

D379 Swivel‑Base Mounting Drill Fixture

Fixture for locating and drilling a through hole for
mounting a magnetic door holder on a door.

Order number D379