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)
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