CTX Series Automatic Transfer Switch

< Back

Financing & Insurance
See our Offers
View Product Downloads
Please answer to continue. Select an option to continue. Enter a valid email address.
Yes, I would like to receive future marketing communications (such as email) from Caterpillar Inc., its affiliates and subsidiaries worldwide and the Caterpillar dealer network. Regardless of whether you decide to receive these marketing communications, Caterpillar will continue to send service/transactional messages, including those that have to do with any accounts that you may have with us.


Cat® CTX Series switches are built for residential and light commercial applications requiring the dependability and ease of operation found in a power contactor switch.
Voltage sensing and system control is performed via a state-of-the-art microcontroller located on the cabinet door.

Technical Summary

Rating Range 40-400A 40-400A Less
Transfer Type Open transition Open transition Less
Switch Type Contactor Based Contactor Based Less

MX Control Panel

    CTX switches are equipped with the MX-60 control panel as standard.
    This microprocessor control includes:
  • Undervoltage sensing (90% pickup/80% dropout of the utility source
    • Voltage and frequency sensing of the generator source (90% voltage/95% frequency pickup)
    • Time Delay Engine Start – 5 seconds (P)
    • Time Delay Engine Warmup – Transfer to Generator – 20 seconds (W)
    • Time Delay Utility Stabilization/Retransfer to Utility – 5 minutes (T)
    • Time Delay Engine Cool Down – 5 minutes (U)

    All time delays are fixed.

CTX Series Automatic Transfer Switch Standard Equipment

The unit is available in open type, NEMA 1 or NEMA 3R enclosures. The MX-60 control panel adds a user interface and functionality, including:
  • Indicating LEDs for power availability, switch position and load energized
  • Pushbuttons for test, exercise set, timer bypass and program cancel
  • Special status annunciation of in-phase transfer and times operation
  • Selectable 7, 14, 21 or 28 day (factory set 28 days) generator exerciser timer
  • Diagnostic LED indications in logical one-line configuration

Additional options include:
  • A3/A4 Auxiliary contacts (1 each) closed in utility and generator positions
  • Special timer settings