Description—Firetrol® Power Transfer Switches areavailable completely assembled with Firetrol Elec-tric Fire Pump Controllers; full or reduced voltagetypes. The power transfer switches are built in twoversions:FTA900 — For use when the normal power sourceis a utility and the emergency power source is a gen-erator set.FTA950 — For use when both the normal and emer-gency power sources are utilities.The entire package of power transfer switch and

controller is completely factory assembled, wired,tested and shipped as a complete unit for easy fieldconnection to the power sources and the fire pumpmotor.

Approvals—Firetrol power transfer switches arelisted by Underwriters' Laboratories, Inc., in accor-dance with UL218, Standard for Fire Pump Control-lers; UL1008, Automatic Transfer Switches; UL508,Industrial Control Equipment, CSA, Standard for In-dustrial Control Equipment; and approved by Fac-tory Mutual. They are built to meet or exceed therequirements of the approving authorities as well asNEMA and the latest editions of NFPA 20, Installa-tion of Centrifugal Fire Pumps, and NFPA 70, Na-tional Electrical Code.

Standard Features—The following are included asstandard with each transfer switch:� Emergency power source disconnect switch sized

for connected motor horsepower and voltage� (FTA950 only) Fire pump circuit breaker

Product DescriptionPower Transfer Switches for

Electric Fire Pump ControllersFTA900FTA950

� (FTA950 only) Mark II monitors for overcurrent trip-ping (non-thermal) of circuit breaker and alarm in-dicator for phase failure/phase reversal

� 3-pole, double throw transfer switch mechanism,electrically operated, mechanically held

� Control module providing for the following:Differential voltage sensing on all phases of thenormal power sourceVoltage sensing of the emergency power sourceFrequency sensing of the emergency powersourceTransfer time delay to compensate for momen-tary power outages of the normal sourceRetransfer from emergency to normal source isautomatically delayed unless the emergencysource failsCool-down timer for unloaded running of the gen-erator set after retransfer to the normal powersourceInstantaneous retransfer to normal if the emer-gency source fails and the normal source is avail-able3 second transfer restart delay to reduce currentsurges when transferring to or from the emer-gency sourceNO and NC engine control contacts to start thegenerator set when the normal power source fails

� Transfer Switch Normal LED� Transfer Switch Emergency LED� Emergency Isolating Switch Open LED� Test Selector Switch� Transfer By-pass Switch� Silence Alarm Pushbutton� Emergency Isolating Switch Open and Transfer

Switch in Emergency Audible Alarms� Output contacts (NO and NC) for Generator Start,

Emergency Isolating Switch Open and TransferSwitch position indicators

� Standard Withstand Rating, emergency side onlyFTA900 (Generator set equipped with moldedcase circuit breaker)100-150A, 22,000A RMS Sym., 200-480V;

10,000A RMS Sym., 550-600V260-400A, 35,000A RMS Sym ., 200-480 V;

10,000A RMS Sym., 550-600 V600-800A, 50,000A RMS Sym., 200-480V;

10,000A RMS Sym., 550-600V(See Options for higher ratings)

FTA950—See Options� NEMA Type 2 enclosure (IEC IP11)

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(919) 460-5200 • www.firetrol.com • Sales Office: Cary, NC 27512 USA

Options—The following are available as options toFTA900 Power Transfer Switches: (Note: The with-stand rating of the normal power source side of thetransfer switch will be the same as the withstand rat-ing of the fire pump controller assembled with the powertransfer switch.)-M Optional withstand rating

200-600V - 100,000 Amps, RMS Sym.(Contact factory for applications above 250 HP)

The following are available as options to FTA950 PowerTransfer Switches: (Note: The short circuit currentrating for the normal power source and the emergencypower source side of the power transfer switch will bethe same as the rating of the fire pump controller as-sembled with the power transfer switch.)Circuit Breaker Option-M Standard withstand rating

200-600V - 100,000 Amps, RMS Sym.-N Intermediate withstand rating

200-600V - 150,000 Amps, RMS Sym.-P High withstand rating

200-600V - 200,000 Amps, RMS Sym.-Q Standard intermediate withstand rating

200-480V - 65,000 Amps RMS Sym.-R Standard low withstand rating

550-600V - 42,000 Amps RMS Sym.

Modifications—The following are available as modi-fications to all transfer switches:Special Enclosures-T NEMA Type 3R (IEC IP14)-E NEMA Type 4 (painted steel) (IEC IP56)-F NEMA Type 4X (#304 stainless steel) (IEC IP

56)-G NEMA Type 12 (IEC IP52)

Special finish paint—consult factorySpecial finish color—consult factory

Anti-condensation Space Heaters-H 120 Volt space heater-J 120 Volt space heater with thermostat-K 120 Volt space heater with humidistat-L 240 Volt space heater-M 240 Volt space heater with thermostat-N 240 Volt space heater with humidistat

PD900-20(B)

Alarms-EC Extra contacts for remote indication, transfer switch

position-BX Contacts for remote indication, second utility source

phase failure/phase reversal (FTA950 only)Miscellaneous-ED Load shed circuits-TM Microprocessor type (Group 5) control module-TN As above, with serial communications port-S Tropicalization