Emerson Bypass Isolation Switches, Separately Mounted, TSA, FTA950 Brochures and Data Sheets

Power Transfer Switches

Completely assembled with fire pump controllers.

Firetrol® power transfer switches are available com­pletely assembled with Firetrol electric fi re pump
controllers – full voltage or reduced voltage types.

The entire package of power transfer switch and
controller is completely factory assembled, wired,
tested and shipped as a complete unit for easy fi eld
connection to the power sources and the fi re pump
motor. The power transfer switch and the electric
fi re pump controller are assembled in separate but
connected enclosure compartments. All wiring be­tween the two enclosures in completed by Firetrol.

Approvals

The power transfer switches are listed by Underwrit­ers Laboratories, Inc. for transfer switch service and
also meet the requirements of NFPA 20, Standard

for the Installation of Stationary Pumps for Fire Pro­tection and NFPA 70, National Electrical Code. The

automatic/manual power transfer switches are
listed by Underwriters Laboratories, Inc. under UL­1008, Automatic Transfer Switches, as well as UL-508,
Industrial Control Equipment.

Construction

The construction of the FTA950 power transfer
switch includes an isolating disconnect switch/
circuit breaker assembly, designed for fi re pump
service, providing short circuit, locked rotor and
running current protection for the fi re pump con-
troller and the motor. The operating handle has a
mechanical interlock so that the enclosure door
can not be opened with the isolating disconnect
switch in the ON position. The operating handle
mechanism closes and opens both the isolating dis­connect switch and the circuit breaker in the proper
sequence. When the handle is moved to the ON
position, the isolating disconnect switch is closed
fi rst and then the circuit breaker. When moved to
the OFF position, the circuit breaker opens fi rst and
then the isolating disconnect switch. The circuit
breaker always “makes” and “breaks” the load.

The transfer switch is electrically operated and
mechanically held. The electrical operator is a mo­mentarily energized, single solenoid mechanism.
The switch is mechanically interlocked to ensure
only two possible positions, normal or emergency.
The transfer switch control panel features a 4 line,
20 character LCD display and keypad for viewing
all available data and setting desired operational
parameters. Source status screens are provided
for both normal & emergency to provide digital
readout of voltage, frequency and phase rotation
on all 3 phases.

Included on the fi re pump Mark IIXG user interface
panel are LED’s for TRANSFER SWITCH NORMAL,
TRANSFER SWITCH EMERGENCY and EMERGENCY
ISOLATING SWITCH OFF. Mounted on the enclosure
fl ange are TEST and TRANSFER BYPASS selector
switches and the audible alarm.

FTA976 power transfer switches for use with Limited
Service Controllers are constructed identically as
the FTA950 except that a thermal magnetic circuit
breaker is supplied and no disconnect switch is
required. They are also available for use with single­phase Limited Service Controllers.

Short Circuit Current Rating

The short circuit current rating for the normal
power source and the emergency power source side
of the power transfer switch will be the same as the
rating of the fi re pump controller assembled with
the power transfer switch.

User Interface

ASCO Group 5 Control Panel

Separately mounted transfer
switches.

Firetrol
Automatic Transfer Switches are designed for use
when pump room size constraints will not allow an
integral controller/transfer switch confi guration, or
where a transfer switch is now being required on an
existing installation. They are intended for use with
Listed and Approved fi re pump controllers.

Approvals

Firetrol® Separately Mounted Fire Pump Automatic
Transfer Switches are listed by Underwriters’ Labo­ratories, Inc., for transfer switch service and also
meet the requirements of NFPA 20, Standard for the
Installation of Stationary Pumps for Fire Protection

®

brand Separately Mounted Fire Pump

and NFPA 70, National Electrical Code. The transfer
switches are listed by Underwriters Laboratories,
Inc. under UL-1008, Automatic Transfer Switches,
as well as UL-508, Industrial Control Equipment.

Configurations

Firetrol Separately Mounted Automatic Transfer
Switches are available in the following confi gura-
tions:
FTA902 – Provides the transfer of 3-phase power to

a fi re pump controller between a utility on
the normal side and a generator on the
alternate (emergency) side. The discon­necting means and overcurrent protec­tive devices required for the normal side
of the transfer switch are NOT supplied.

FTA903 – Provides the transfer of 3-phase power to

a fi re pump controller between a utility on
the normal side and a generator on the
alternate (emergency) side. The discon­necting means and overcurrent protec­tive devices required for the normal side
of the transfer switch ARE provided.

FTA952 – Provides the transfer of 3-phase power to

a fi re pump controller between a utility on
the normal side and a 2nd utility on the
alternate (emergency) side. The discon­necting means and overcurrent protec­tive devices required for the normal side
are NOT supplied. The disconnecting
means and overcurrent protective for
the alternate (emergency) side are NOT
supplied.

FTA953 – Provides the transfer of 3-phase power to

a fi re pump controller between a utility on
the normal side and a 2nd Utility on the
alternate (emergency) side. The discon­necting means and overcurrent protec­tive devices required for the normal side
and alternate side of the transfer switch
ARE provided.

Features

Firetrol Separately Mounted Automatic Trans­fer Switches feature the ASCO 7000 series transfer
switch with Group 5 controller as standard. The
microprocessor based controller includes a built-in
keypad and four line LCD display mounted through
the enclosure door. This allows all monitoring and
control functions to be done with the door closed,
providing convenience and safety.
The menu driven user interface allows setting

changes to be made easily. These settings include:

• Voltage and Frequency

• Time Delays

• Features

• Engine Exerciser

• Event Log

• Service Features

Bypass-Isolation transfer
switches

®

Firetrol
Switches are designed to be used with any Firetrol®
Electric Fire Pump Controller. The entire package of
Automatic Transfer & Bypass-Isolation Switch and
Electric Fire Pump Controller is completely factory
assembled, wired, tested and shipped as a complete
unit for easy fi eld connection to the power sources
and the fi re pump motor.
Automatic Transfer & Bypass-Isolation Switches
are designed for critical applications where the
transfer switch cannot be taken out of service for
maintenance or repair purposes; these applications
include health care facilities, data centers, retire­ment facilities and correctional institutions.

Approvals

Firetrol Automatic Transfer & Bypass-Isolation
Switches are listed by Underwriters Laboratories,
Inc. for transfer switch service and also meet the
requirements of NFPA 20, Standard for the Instal­lation of Stationary Pumps for Fire Protection and
NFPA 70, National Electrical Code. The Automatic
Transfer & Bypass-Isolation Switches are listed by
Underwriters Laboratories, Inc. under UL-1008,
Automatic Transfer Switches, as well as UL-508,
Industrial Control Equipment.

Construction

The power transfer switch and the electric fi re
pump controller are assembled in separate but con­nected NEMA type 2 enclosures. All wiring between
the two enclosures is completed by Firetrol. The en­closure containing the Automatic Transfer & Bypass­Isolation Switch is constructed with a dead front
door-in-door design. The transfer switch BYPASS /
ISOLATION handles as well as the operating controls
& indicators are located behind the outer enclosure
door. The enclosure containing the transfer switch
disconnecting means and overcurrent protection is

Automatic Transfer & Bypass-Isolation

attached adjacent to the transfer switch enclosure.
The operating handle has a mechanical interlock
so that the enclosure door cannot be opened with
the isolating disconnect switch in the ON position.

Switch Features

• Allows bypa

ss-isolation without load

interruption.

• Bypass switch and transfer switch have
identical electrical ratings.

• Heavy duty mechanical interlocks prevent
undesirable operation.

• Bypass contacts carry current only during
bypass mode.

• Bypass and isolation handles are perma-
nently mounted.

• Bypass switch is fully rated for use as a
manual 3-position transfer switch.

• Bypass and isolation functions are simple,
requiring a total of two operating handles.

• No toggle switches, push buttons, selector
switches or levers are required for bypass-
isolation operation.

• Mechanical indicators show bypass and
transfer switch positions.

Control

Automatic transfer switch control is provided by
an ASCO

®

Group 5 Microprocessor based control

panel. The control panel features a built-in keypad
and four-line LCD display, allowing all monitoring
and control functions to be done with the enclosure
door closed. The six key keypad allows access to the
easily navigated menu system to monitor system
status or to adjust settings. A Transfer/Bypass panel
provides a single line connection diagram with LED
indication for switch positions and power source
information. Also included on the panel is a lamp
test push-button and Auto-Run engine selector
switch.

Bypass and Isolation Operating Handles

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While every precaution has been taken to ensure accuracy and completeness herein, ASCO assumes no responsibility, and disclaims all liability, for damages resulting from use
of this information or for any errors or omissions. Information and specifications are subject to change without notice.
Emerson, Consider It Solved., Emerson Network Power, the Emerson Network Power Logo, ASCO, Firetrol and the Firetrol Logo are trademarks or registered trademarks of
Emerson Electric Co. All other names and logos referred to are trade names, trademarks, or registered trademarks of their respective owners. ©2013 Emerson Electric Co.

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