Wheelock MB Series
Motor Bells
Description
Wheelock’s Series MB Motor Bells
provide a better engineered motor bell
for fire and life safety alarm systems.
The Wheelock Series MB Bells include
higher dBA, low current draw, built-in
trimplate for semi-flush mounting, low
frequency aluminum shells, and low RFI
noise. The motor for Series MB Bells is
a durable, high torque permanent
magnet motor selected for its high
performance and long life.
Series RSSP Sync/Non-Sync retrofit
plates are used in conjunction with the
Series MB Motor Bell when combination
appliances are required. The Series
RSSP retrofit plates are available with
either Multi-Candela or single candela
strobes and easily mount to a 4” square
or Wheelock SBL-2 backbox. All Series
RSSP strobe appliances meet or exceed
the requirements of NFPA 72 (National
Fire Alarm Code), ANSI 117.1 (American
National Standard for Accessible and
Usable Buildings and Facilities), ADA
(Americans with Disabilities Act) and UL
Standard 1971 (Signaling Devices for the
Hearing Impaired).
The Series RSSP retrofit plates may be synchronized when installed with the
Wheelock Series SM, DSM, Sync Modules or a Power Supply with Wheelock’s
patented sync protocol. Wheelock’s synchronized strobes offer an easy way to
comply with ADA requirements concerning photo-sensitive epilepsy.
Features
• High sound output with low
current draw.
• Low frequency aluminum shells
for better audibility through walls,
doors and other structures.
• 6” and 10” shell sizes in 12 or 24
VDC models.
• Integral RFI suppression to
minimize included noise on the
NAC circuit.
• Mounting options for surface,
semi-flush, outdoor, and con-
cealed conduit installation.
• Built-in trimplate makes semi-
flush mounting simpler and less
expensive
• Polarized for DC supervision of
NAC circuits.
• Operates on filtered or unfiltered
DC.
Listings
Listings and approvals below
apply to Wheelock MB Series
Motor Bells. In some cases,
certain modules may not be
listed by certain approval agen-
cies, or listing may be in pro-
cess. Consult factory for latest
listing status.
• UL Listed: file E5946
• ULC Listed: file CS243
• FM approved.
• MEA approved: file 151-92-E.
• CSFM approved: files 7135-
0785:113.
Engineer’s Specification
The alarm appliances shall be Wheelock Series MB vibrating Motor Bells or
approved equal. They shall be UL Standard 464 Listed for Fire Protective
Service. Shells shall be aluminum in 6” or 10” diameter. Sound output at 10
feet shall be 92 dBA. The bells shall incorporate a permanent magnet motor
and suppression circuitry to minimize RFI. They shall include a built-in
trimplate for semi-flush mounting to a standard 4” square backbox, or surface
mounting to Wheelock’s indoor BB backbox or outdoor WBB backbox. For
bell strobe applications, retrofit plates Wheelock Series RSSP with Multi-
Candela or Single Candela strobes shall be used. All bell models shall be
polarized for line supervision and shall have screw terminals for in-out field
wiring of #12 to #18 AWG wire. Operating voltage shall be nominal 24 VDC or
12 VDC. Finish on all models shall be red enamel.
MB Series Motor Bells
CS-2236
05/04/04
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