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The Cat® CTS Series Automatic Transfer Switch(ATS)is configurable for applications requiring the dependability and ease of operation found in a full featured power contactor type transfer switch. The CTS Series is equipped with the MX250 controller that is designed for the most demanding transfer or bypass switch applications.
Benefits
The
Cat CTS series
contactor type transfer switch
makes use of a fully programmable / configurable microprocessor-based controller to allow the utmost in application flexibility
Features At A Glance
Performance Features
Contact transfer speed less than 100 milliseconds
High close-in and withstand capability
Temperature rise test per UL 1008 conducted after overload and endurance tests in unventilated enclosure – exceeds UL requirements
Equipped with the MX250 Control Package
Design and Construction Features
Double throw, interlocked operation
Electrically operated, mechanically held by a simple, over-center mechanism
Silver alloy contacts with separate arcing contacts on 600 amp and above
Arc quenching grids, enclosed arc chambers, and wide contact air gap for superior source to- source isolation on all units
Control circuit disconnect plug and drive inhibit switch for safe maintenance
Components accessible for inspection and maintenance without removal of the switch or the power conductors
Mechanical indicator and contact chamber cover designed for inspection, safety and position designation
The Cat CTS Series power contactor type transfer switch makes use of a fully programmable / configurable microprocessor-based controller to allow the utmost in application flexibility. Further, the CTS Series is offered in a wide array of configurations enabling it to meet the needs of even the most highly critical load.Available configurations include:
40-4000 Amps:
CTSD Delayed Transition Transfer Switches
CTSM Manual Transfer Switches
CTS Automatic Transfer Switches
100-4000 Amps:
CTSCT Closed Transition Transfer Switches
CBTSD Delayed Transition Bypass Switches
CBTSCT Closed Transition Bypass Switches
CBTS Automatic Transfer/Bypass Switches
All CTS products meet or exceed industry requirements to allow specification and installation with confidence.
Codes and Standards: NFPA 0,99, 101,110,NEC 517,700,701,702,IEEE 446, 241,NEMA ICS2-447
CSA C22.2 No. 178 listed through 600 VAC
Quality System: ISO 9001 Registered
UL 1008 listed through 480 VAC
Controls tested in accordance with:
Equipment (Controls and Power Section)Seismic Test Qualified to: IBC-2003 IEEE-693-2005
Enclosures meet the requirements of: UL 508, UL 50, ICS 6, ANSI C33.76 and NEMA 250
IEC 947-6-1 listed through 480 VAC
This ruggedly built family of power contactor switches has been specifically designed for transfer switch duty with dependability, versatility and user friendliness of prime concern. The CTS power panel components, consisting of power switching contacts, drive mechanism and terminal lugs, are mounted on a specially formed backplane. Logic devices including microprocessor control auxiliary time delays and special accessory equipment are assembled on the door for ease of maintenance and separation from the power section. They are connected with a numbered wiring harness equipped with a disconnect plug that allows isolation of the control panel for maintenance.
CTS Series Method of Operation
When the normal source fails or the voltage drops to a predetermined point (usually 80% of nominal), if required, a circuit is closed to start the engine generator set. When the emergency source reaches 90% of rated voltage and 95% of rated frequency, the drive solenoid is energized through the emergency coil control relay, causing the main contacts to disconnect the load from the normal source and connect it to the emergency source. After the drive solenoid has completed its electrical stroke and is seated, the emergency coil control relay opens to disconnect it. The transfer switch is now mechanically locked in the emergency position. When normal voltage is the normal source and connect it to the emergency source. After the drive solenoid has completed its electrical stroke and is seated, the emergency coil control relay opens to disconnect it. The transfer switch is now mechanically locked in the emergency position. When normal voltage is and is seated, the coil control relay opens to disconnect it. The transfer switch is now mechanically locked in the normal position.
Drive Mechanism
All CTS switches employ the simple “over-center” principle to achieve a mechanically locked position in either normal or emergency and a high speed drive assures contact transfer in 100 ms or less. High contact pressure and positive mechanical lock allow for high withstand and closing ratings, far exceeding UL requirements.
See how CTS Series Automatic Transfer Switch compares against frequently compared products.
Electric PowerCTS Series Automatic Transfer Switch
Rating Range
40 to 4000A
40 to 4000A
Transfer Type
Open transition
Open transition
Switch Type
Contactor Based
Contactor Based
Selected Model
Electric PowerCTGSE & CTGDSE Series Service Rated Entrance Rated ATS
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