Bosch MB-G6-24-R, MB-G6-12-R, MB-G10-24-R, MB-G10-12-R Specsheet

Fire Alarm Systems | MB Motor Bells

MB Motor Bells

www.boschsecurity.com

u High sound output for improved alerting capabilities

u High efficiency, low current motor

u Low starting voltage

These Wheelock motor bells use a high‑quality,
micro‑motor operating mechanism. This provides long­term reliability, low starting voltage, and extremely low
current consumption. These features enable the use of
more bells per circuit and greater alarm signal
distribution than conventional bells. The low starting
voltage provides a stronger signal on marginal circuits.
These motor bells eliminate the coils and contacts
found in conventional vibratory bells. They contain a
highly-efficient DC motor drive system to produce high
sound pressure levels at lower current requirements.
As a result, they reduce EMI generation problems.
The operating mechanism is enclosed in a die-cast
aluminum housing, making the bells suitable for both
interior and exterior applications. The steel gong and
striker last longer and produce a louder sound output.

Certifications and approvals

Cooper Wheelock, Inc. holds these Listings and
Approvals:

Region

Certification

USA UL ULSZ: Audible Signal Appliances

(UL464)

FM MB Family

u Fully‑enclosed mechanism

u Durable keyed steel gong and striker

Region Certification

CSFM see our website

Canada ULC ULSZC: Audible Signal Appliances and

Accessories, Fire Alarm

Hong Kong HKFSD J-005/C/035 & J-005/C/038

Installation/configuration notes

Compatible Products

The following products are compatible with the MB
Motor Bells:

CategoryProduct ID Product Description

Control
Panels

D7022

D7024

Compatible with all Bosch G Series, 6000 Series, 2000
Series, DS7400Xi and DS7400XiV4, DS7080iP‑32,
DS7200 Series, and DS7060 Series Control Panels

2

3

Conventional FACP

Addressable FACP

1

D7024 Conventional FACP

D8024

D9124

4

4

Analog FACP

Addressable FACP

2 | MB Motor Bells

D10024A

FPD-7024

FPD-7024

FPA-1000

Modules SM‑12/24‑R Synchronization module (red)

DSM‑12/24‑R Dual synchronization module

Strobes RSSP‑241575W‑FR Fixed‑candela retrofit strobe plate

RSSP‑24MCW‑FR Multi‑candela retrofit strobe plate

RSSP‑24MCWH‑FR High‑candela retrofit strobe plate

1

For synchronization, use the SM or DSM modules

4

3,5

5

5

Analog FACP

Addressable FACP

Conventional FACP

Analog Addressable FACPs

(red)

with these control panels and set the horns and
synchronization module for 12 VDC operation.

2

The D7022 can be used in either 12 VDC or 24 VDC
mode, but the synchronization module must be set for
the same operating voltage as the control panel, and
the bells must operate at the voltage supplied by the
control panel.

3

When used with a D7039 Multiplex Expansion
Module, the FPD-7024 and D7024 become
addressable fire alarm control panels (FACPs).

4

For synchronization, use the SM or DSM modules
with these control panels and set the synchronization
module for 24 VDC operation, and use 24 VDC bells.

5

24 V motor bells only.

Current Rating

The peak current of all these motor bells is
approximately four times the rated current. This peak
current surge exists for about 6 ms and must be
supplied by the system power supply to ensure
start‑up of all devices. If the system power supply
does not have sufficient surge capability (generally
provided by large filter capacitors), base loading of the
supply on the DC bell peak requirements rather than
their rated current.

Mounting Considerations

Outdoor or Severe Environment Applications
For an outdoor application or a severe environment
(NEMA 3R) application, these motor bells in
combination with a WBB‑R Weather Resistant Back
Box must be mounted on a flat wall such that the wall
covers the entire rear surface of the back box. The
back box must have its drain holes pointed toward the
ground. The knockouts in the rear surface of the back
box must remain intact.
The knockout hole on top of the back box is sized for a
half‑inch. conduit and matching connector. Use a
proper watertight conduit fitting.
Indoor Applications
For inside applications, mount these motor bells
directly on the indicated back boxes for the indicated
applications:

Conduit

Applications

Four‑inch square • •

BB • • •

DBB • • •

SBB • •

SHBB •

Surface
Mounted

Semi‑Flush
Mounted

Use as Combination Appliance
Where combination appliances are required, these
motor bells can be used with the RSSP‑241575W‑FR
(15/75 cd), RSSP‑24MCW‑FR (15 cd, 30 cd, 75 cd, or
110 cd), or RSSP‑24MCWH‑FR (135 cd or 185 cd)
Retrofit Strobe Plates that are designed to meet or
exceed the latest requirements of NFPA 72, ANSI

117.0 and UL 1971. The bells and retrofit strobe plates
are also compatible with the SBL2‑R Retrofit Device
Back Box.

Wiring

These motor bells are polarized for use on supervised
notification appliance circuits (NAC). All units are
provided with four 6 in. (15.2 cm), 18 AWG (ISO

0.75 mm2) color‑coded leads to meet UL requirements
and ensure correct polarity of notification appliance
circuit wiring connections.

• Built‑in EMI suppression

• Mounting options include surface, flush, semi‑flush,
and exterior

• Operates on filtered or unfiltered DC

Parts included

Quant. Component

1 Motor bell

1 Hardware pack

1 Literature pack

Technical specifications

Electrical

Current (maximum) at 8 VDC to 17.5 VDC

VDC: 90 mA

VFWR: 110 mA

Current (maximum) at 16 VDC to 33 VDC

VDC: 40 mA

VFWR: 56 mA

Environmental

Relative Humidity: Up to 85%

Temperature (Operating): -31°F to +151°F (-35°C to +66°C)

3 | MB Motor Bells

Mechanical

Color: High‑gloss, red enamel

Material: Base: die‑cast aluminum

Gong: steel

UL dB Rating

Spherical: 92 dB at 10 ft. (3 m)

Ordering information

MB‑G6‑12‑R 12 V Motor Bell (6 in. [15 cm])

Red, 12 VDC bell with a high efficiency, low current
motor providing high sound output for improved
alerting capabilities

Order number MB-G6-12-R

MB‑G6‑24‑R 24 V Motor Bell (6 in. [15 cm])

Red, 24 VDC bell with a high efficiency, low current
motor providing high sound output for improved
alerting capabilities

Order number MB-G6-24-R

MB‑G10‑12‑R 12 V Motor Bell (10 in. [25.4 cm])

Red, 12 VDC bell with a high efficiency, low current
motor providing high sound output for improved
alerting capabilities

Order number MB-G10-12-R

SBL2‑R Retrofit Device Back Box (red)

dimensions 27.8 cm (10.9 in.) x 15.5 cm (6.1 in.) x

4.3 cm (1.7 in.)

Order number SBL2-R

SFP‑R Semi‑flush Plate (red)

15.2 cm (6 in.) square by 0.8 cm (0.3125 in.) thick

Order number SFP-R

SHBB‑R Shallow Surface Back Box (red)

12.7 cm (5 in.) square by 4 cm (1.56 in.) deep

Order number SHBB-R

WBB‑R Weather‑resistant Back Box (red)

10.5 cm (4.125 in.) square by 5.1 cm (2 in.) deep

Order number WBB-R

MB‑G10‑24‑R 24 V Motor Bell (10 in. [25.4 cm])

Red, 24 VDC bell with a high efficiency, low current
motor providing high sound output for improved
alerting capabilities

Order number MB-G10-24-R

Accessories

AP‑R Adapter Plate

Red, 15.2 cm (6 in.) square

Order number AP-R

BB‑R Steel Back Box

Black, 10.2 cm (4 in.) square, 3.8 cm (1.5 in.) deep

Order number BB-R

DBB‑R Steel Back Box (red)

8.6 cm (3.375 in.) square, 5.6 cm (2.1875 in.) deep

Order number DBB-R

RP‑R Retrofit Plate (red)

20.3 cm (8 in.) high, 14.9 cm (5.875 in.) wide

Order number RP-R

SBB‑R Surface‑mount Back Box (red)

14 cm (5.5 in.) x 14.2 cm (5.6 in.) x 9.1 cm (3.6 in.)

Order number SBB-R

SBB‑W Surface‑mount Back Box (white)

14 cm (5.5 in.) x 14.2 cm (5.6 in.) x 9.1 cm (3.6 in.)

Order number SBB-W

4 | MB Motor Bells

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
2711872523 | en, V2, 13. Aug 2014