SNAP ACTION SWITCH (P/N 12524)
Snap Action Switch, designed to be mounted in the MRM / MRM II / PRM, are used to control various output
functions. These output functions may involve turning off or turning on power. Examples of output functions
are sounding a visual or audible alarm, operate an electrical gas valve, send a signal to an unsupervised
building fire alarm system, shut off supply air fans and energize a relay to shut off electrical appliances. Two
SPDT snap action switches, one PN12524 and one PN 18312, are pre-installed in the MRM, MRM II and
PRM. Up to 2 additional SPDT switches may be added for a total of our configurations – SPDT, DPDT,
3PDT and 4PDT.
ALARM-INITIATING SNAP ACTION SWITCH (P/N 18312)
One alarm initiating Snap Action Switch, (P/N 18312), is pre-
installed and is used when the system is required to be
electrically connected to a fire alarm system per NFPA 17 and
NFPA 72 in a supervised, four-wire manner. It is designed to
be mounted in the Mechanical Release Module (MRM / MRM II)
and the Pneumatic Release Module (PRM) only for the purpose
of initiating an alarm in a supervised fire alarm system. All
Snap Action Switch connections are to be made outside the
MRM / MRM II / PRM in an approved junction box. This is a
SPST; 0.25A; 30 VDC; N.O. switch.
VENT PLUG (P/N 10173)
The vent plug is required in the system actuation network to allow a
means of relieving pressure in the actuation piping after a system
discharge, and to prevent a slow build-up of pressure in the actuation
line.
120 VAC Horn & Strobe (P/N 21396)
The Horn & Strobe Assembly is provided for use when visual and
sound warnings are required at system actuation. The unit requires
the use of a 4” square (10.16cm sq.) x 2 1/8” (5.5cm) deep back-box
with ½” conduit entrance on the top of the box. This device is to be
used with 120 VAC power supply and may be used inside or
outside. Refer to installation and setup instructions supplied with
each unit.
April 2011
Section 2 System Components
Page 2 – 14
Amerex Restaurant Fire Suppression System (EX4658)
Red
Common
Non Alarm
Condition
Yellow
N.O.
Black
N.C.
COMMON -
LEADS SOLDERED IN PLACE
NORMALLY OPEN -
LEADS SOLDERED IN PLACE
SNAP ACTION SWITCH
SINGLE POLE
DOUBLE THROW
P/N 12524
