Electric Power

  • Specs Summary
  • Rating Range
    40 to 4000A
  • Transfer Type
    Open transition
  • Switch Type
    Contactor Based
  • Control Power
    40 to 4000 amperes, 2, 3 or 4 Poles

CTS Series Automatic Transfer Switch


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.

Technical Summary

  • Rating Range 40 to 4000A
  • Transfer Type Open transition
  • Switch Type Contactor Based

Electrical Ratings

  • Control Power 40 to 4000 amperes, 2, 3 or 4 Poles
  • Enclosure Capability NEMA 1, 3R, 4, 4X and 12
  • System Voltage Application Available to 600 VAC, 50 or 60 Hz
  • Applicable Testing UL 1008 listed at 480 VAC
    CSA C22.2 No. 178 certified at 600 VAC
    IEC 947-6-1 listed through 480 VAC

Controller Specifications

Standard Equipment

The Cat CTS Series of Automatic Transfer Switches

  • 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 e

40-4000 Amps:

  • CTS Automatic Transfer Switches
  • CTSD Delayed Transition Transfer Switches
  • CTSM Manual Transfer Switches

100-4000 Amps:

  • CTSCT Closed Transition Transfer Switches
  • CBTS Automatic Transfer/Bypass Switches
  • CBTSD Delayed Transition Bypass Switches
  • CBTSCT Closed Transition Bypass Switches

All CTS products meet or exceed industry requirements to allow specification and installation with confidence.

  • UL 1008 listed through 480 VAC
  • CSA C22.2 No. 178 listed through 600 VAC
  • IEC 947-6-1 listed through 480 VAC
  • Codes and Standards: NFPA 0,99, 101,110,NEC 517,700,701,702,IEEE 446, 241,NEMA ICS2-447
  • Controls tested in accordance with:
  • Equipment (Controls and Power Section)Seismic Test Qualified to:<br>IBC-2003 <br>IEEE-693-2005
  • Enclosures meet the requirements of:<br>UL 508, UL 50, ICS 6, ANSI C33.76 and NEMA 250
  • Quality System:<br>ISO 9001 Registered
  • 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.<br>The CTS power panel components, consisting of power switching contact

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 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

Optional Equipment