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CTG Series Automatic Transfer Switch

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.

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Transfer TypeOpen transition

Rating Range40-3000A

Switch TypeContactor based


Auxiliary Contact:
Closed when the switch is in the normal position
(Additional contacts optional)

Time Delay to Engine Start: Standard setting 3 seconds, adjustable 0-10 seconds

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

Indicating LED Pilot Lights:
-Switch in emergency position
-Switch in normal position
- Normal source available
-Emergency source available

When specified for use with a CTGD Series delayed transition switch, the control panel also includes the following:

Event Log OD 16 Event that track date, time, reason and action taken

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

7, 14, 28 day interval timed exerciser, pushbutton/timer operation

Test Switch - Momentary

In-Phase Monitor, self-adjusting (Not available on CTGD models)

Auxiliary Contact:
Closed when the switch is in the emergency position
(Additional contacts optional)

Push button Bypass of time delay and normal emergency

Voltage and Frequency Indication for S1 and S2

Engine Start Contact


LED/LCD indicators for ease of viewing and long life

Time Delay for Engine Cool Down: Allows engine to run unloaded after switch retransfer to normal; standard setting 5 minutes, adjustable 0-60 minutes

Inputs opto-isolated for high electrical immunity to transients and noise

Built-in diagnostics with LCD display for immediate troubleshooting

Nonvolatile memory (exerciser battery backup not required for standard operation)

Processor and digital circuitry isolated from line voltage

Communications header for network interface

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


Service entrance configuration

Auxiliary Contacts: Closed when the transfer switch is in Source 1 position

Elevator Pre-Signal Auxiliary Contacts: Open 0-60 seconds prior to transfer to either direction, re-closes after transfer

Space heater and thermostat

Auxiliary Contact, operates on Source 1 line failure

Note:For applications requiring additional options or other configurations, see the CTS Series fully configurable transfer switch.

Auxiliary Contact, operates on Source 2 availability

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)

Network communications interface card (LonWorks / ModBus)

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.

Auxiliary Contacts: Closed when the transfer switch is in Source 2 position

Power Measurement Meters

Maintained Test Switch

Disconnect Switch: Permits transfer in “AUTO” position and inhibits transfer in “INHIBIT” position. (Standard 800A and above)

Lockable, see-through cover for ATS controller

Voltage Imbalance Monitor (Three Phase)

Maintained Test Switch w/Keypad



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