Power Transfer
Switches
Completely assembled with fire pump controllers.
Firetrol® power transfer switches are available completely assembled with Firetrol electric fire 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 field connection to the power sources and the fire pump motor. The power transfer switch and the electric fire 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 fire pump service, providing short circuit, locked rotor and running current protection for the fire pump controller 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 first and then the circuit breaker. When moved to the OFF position, the circuit breaker opens first 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 fire 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 flange 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 fire pump controller assembled with the power transfer switch.
User Interface
ASCO Group 5 Control Panel
Separately mounted transfer switches.
Firetrol® brand Separately Mounted Fire Pump Automatic Transfer Switches are designed for use when pump room size constraints will not allow an integral controller/transfer switch configuration, or where a transfer switch is now being required on an existing installation. They are intended for use with Listed and Approved fire 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
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