Bussmann
®
Bussmann
®
Power Module
™
Switch
PS
All-In-One Module
Legend:
N.O.F.A.
– Normally Open Fire Alarm contacts supplied from the fire alarm system to initiate the shunt trip.
Shunt Trip
– Solenoid for remote trip of switch, which is activated by the closing of the fire alarm contacts or key test switch.
Option R2
– Fire Safety Interface Relay that is operated at 24VDC from fire alarm system. May require an additional power source to be needed.
CR
– Control Relay used to isolate the N.O.F.A. contacts from the duty of the shunt trip.
FR
– Fire Alarm Voltage Monitoring Relay used to monitor presence of voltage in switch from a remote location (i.e. Fire Alarm Control Panel).
PL
– Pilot Light to visually indicate presence of voltage on outside of switch enclosure.
CPT
– Control Power Transformer used to step down line voltage to 120VAC to power shunt trip coil.
SW Aux.
– Normally closed contact when switch is closed. Opens as power switch opens.
Key Test
– Key-to-Test switch used to operate shunt trip from the outside of switch enclosure. Can be used for trouble-shooting and inspection.
Mechanically Interlocked Auxiliary Contact – Contact used to disconnect secondary source of power.
■
– Terminal Block Connection Point.
●
– Pre-wired Connection Points
Typical Control with Wiring Options for Fire Safety Interface (Option R2)
8-29-01
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Form No. PS
Page 4 of 5
BIF Doc# 1145
