MB Series Motor Bells CS-2236 05/04/04

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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.

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.

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.