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CTX Series Automatic Transfer Switch

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Overview

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

Units:
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

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