New | CTG Series Automatic Transfer Switch

The Cat® CTG Series Automatic Transfer Switches (ATS) are pre-configured for applications requiring the dependability and ease of operation found in a full feature power contactor type transfer switch.

CTG switches are equipped with the next generation MX150 microprocessor panel, which controls the operation and displays the status of the transfer switch's position, timers and available sources. As an embedded digital controller, the MX150 offers high reliability and ease of unattended operation across a range of applications.

Technical Summary
Rating Range40-3000A
Switch TypeContactor based
Transfer TypeOpen transition

  • ratings 40 To 3000 Amps (2, 3 Or 4 Poles)
  • Ul 1008 Listed At 480 Vac
  • Csa Certified At 600 Vac (200-225 Amp - 480v)
  • Iec Listed At 480 V
  • double Throw, Mechanically Interlocked Contactor Mechanism
  • electrically Operated, Mechanically Held
  • designed For Emergency And Standby Applications
  • available In Standard Open Transition (ctg)or Delayed Transition (ctgd) Models
  • Ringing Wave Immunity Per Ieee 472 (ansi C37.90a
  • conducted And Radiated Emissions Per En55022 Class B (cispr 11) (exceeds En55011 & Milstd 461 Class 3)
  • esd Immunity Test Per En61000-4-2 (level 4)
  • radiated Rf, Electromagnetic Field Immunity Test Per En61000-4-3 (env50140) 10v/m
  • electrical Fast Transient/burst Immunity Test Per En61000-4-4
  • radiated Rf, Electromagnetic Field Immunity
  • surge Immunity Test Per En61000-4-5 Ieee C62.41 (1.2 X 50 Ms, 5 & 8 Kv)
  • conducted Immunity Test Per En61000-4-6 (env50141)
  • voltage Dips And Interruption Immunity En61000-4-11
  • seismic Compliance To Ieee-693-2005 And Ibc-2003

  • close Differential 3 Phase Under-voltage Sensing Of The Normal Source - Factory Standard Setting 90% Pickup, 80% Dropout (adjustable);under Frequency Sensing Of The Normal Source Factory Setting 95% Pickup (adjustable)
  • voltage And Frequency Sensing Of The Emergency Source - Factory Standard Setting 90% Pickup Voltage, 95% Pickup Frequency (adjustable)
  • test Switch (fast Test/load/no Load) To Simulate Normal Source Failure - Automatically Bypassed Should The Emergency Source Fail
  • type 1 Enclosure Is Standard - Also Available In Open Style Or Types 3r, 4, 4x, Or 12
  • Standard Equipment

    Standard Features
    • Auxiliary Contact:
      Closed when the switch is in the emergency position
      (Additional contacts optional)
    • Auxiliary Contact:
      Closed when the switch is in the normal position
      (Additional contacts optional)
    • 7, 14, 28 day interval timed exerciser, pushbutton/timer operation
    • Engine Start Contact
    • Indicating LED Pilot Lights:
      -Switch in emergency position
      -Switch in normal position
      - Normal source available
      -Emergency source available
    • Time Delay to Engine Start: Standard setting 3 seconds, adjustable 0-10 seconds
    • In-Phase Monitor, self-adjusting (Not available on CTGD models)
    • Time Delay on Retransfer to Normal: To delay retransfer to normal source (immediate retransfer on generator set failure); standard setting 30 minutes, adjustable 0-60 minutes
    • Push button Bypass of time delay and normal emergency
    • Test Switch - Momentary
    • Event Log OD 16 Event that track date, time, reason and action taken
    • Voltage and Frequency Indication for S1 and S2
    • Peak Shave/Remote Load Test: Input for peak shave or remote load test; includes automatic return to normal if emergency source fails and normal is present; 120 VAC
    • When specified for use with a CTGD Series delayed transition switch, the control panel also includes the following:
    MX150 Control Panel
    • Time Delay for Engine Cool Down: Allows engine to run unloaded after switch retransfer to normal; standard setting 5 minutes, adjustable 0-60 minutes
    • Time Delay on Transfer to Emergency: To delay transfer to emergency after verifying emergency source available; standard setting 1 second, adjustable 0-5 minutes
    • Timer and voltage/frequency settings adjustable without disconnection from power sources
    • Built-in diagnostics with LCD display for immediate troubleshooting
    • LED/LCD indicators for ease of viewing and long life
    • Nonvolatile memory (exerciser battery backup not required for standard operation)
    • Processor and digital circuitry isolated from line voltage
    • Inputs opto-isolated for high electrical immunity to transients and noise
    • Communications header for network interface

    Optional Equipment

    • Plant Exerciser, clock type (load/no load): Allows the generator to start and run unloaded or to simulate a power failure, start generator and run under load (7-14-28-365 days, user selectable)
    • Space heater and thermostat
    • Network communications interface card (LonWorks / ModBus)
    • Maintained Test Switch
    • Maintained Test Switch w/Keypad
    • Service entrance configuration
    • Auxiliary Contact, operates on Source 1 line failure
    • Auxiliary Contact, operates on Source 2 availability
    • Auxiliary Contacts: Closed when the transfer switch is in Source 2 position
    • Auxiliary Contacts: Closed when the transfer switch is in Source 1 position
    • Disconnect Switch: Permits transfer in “AUTO” position and inhibits transfer in “INHIBIT” position. (Standard 800A and above)
    • Elevator Pre-Signal Auxiliary Contacts: Open 0-60 seconds prior to transfer to either direction, re-closes after transfer
    • Universal Motor Load Disconnect Circuit: Auxiliary Contact opens 0-60 seconds prior to transfer in either direction, re-closes after transfer. Can be configured by end user for Pre-transfer, Post-transfer, or both.
    • Voltage Imbalance Monitor (Three Phase)
    • Lockable, see-through cover for ATS controller
    • Power Measurement Meters
    • Note:For applications requiring additional options or other configurations, see the CTS Series fully configurable transfer switch.



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