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Automatic Transfer Switch
400 amp, 3-phase, 3 Poles, NEMA 1 indoor
with generator exerciser
(single phase, 2 or 4 pole, NEMA 3R optional)

Yes, we can export this product to most other countries!

Product Description
The Eaton Cutler-Hammer
Automatic Transfer Switch from Eaton’s electrical business is designed to provide unmatched performance, reliability and versatility for critical standby power applications. The switches can be equipped with the ATC-100 or ATC-300 controllers to match your application needs. All the controllers offer rock-solid monitor-ing, status reporting and transfer control operation. Superior design and robust construction make Eaton’s Cutler-Hammer transfer switch the industry benchmark for critical and distributed power systems.  Assembled in Mexico with USA components.

Electrical Ratings
• Ratings 100, 200, 225, 260, 400 and 600 amps.
• 2, 3 or 4-poles.
• Up to 600 Vac, 50/60 Hz.
• NEMA 1, 3R, 12, open.
• UL 1008 listed.
• CSA C22.2 No. 178 certified.
Industrial Design Highlights
• Double-throw, mechanically interlocked
  transfer mechanism.
• Seismic Zone 4 qualified 
Standard Features
• Auxiliary relay contacts:
    • Source 1 Present 2NO and 2NC
    • Source 2 Present 2NO and 2NC
• Switch position indication contacts:
    • Source 1 Position 1NO and 1NC
    • Source 2 Position 1NO and 1NC
• Source 1 and Source 2 sensing:
    • Undervoltage/underfrequency
    • Overvoltage/overfrequency
    • 3-phase rotation protection
    • 3-phase voltage unbalance/loss
• Pre-transfer signal contacts 1NO/1NC.

• Go to Emergency (Source 2).
• Seven field-programmable time delays.
• LCD-based display for programming, system
  diagnostics and Help message display.
• Mimic diagram with source available and
   connected LED indication.
• Time-stamped history log.
• System test pushbutton.
• Programmable plant exerciser -- OFF, daily,
  7, 14, 28-day interval selectable, run time
  0-600 minutes, no load/load with fail-safe.
Optional Features
• Available TVSS surge suppression for
  power/controller, engine start circuit,
  phone and cable connections.
• Field-selectable multi-tap transformer
  panel permits operation on a wide range
  of system voltages.

• Space heater with thermostat.
• Ammeter -- load side.
• Stainless steel cover for controller.



Switch Current Rating 400 amps
Voltage Ratings (field selectable) many including 120, 208, 240, 480V 60Hz, 1 or 3 phase
Operating Temperature (controller) -20 to +70C (-5 to +158F)
Operating Humidity 95% relative humidity, non-condensing
Control Features (see Note 1)

see spec sheets for additional details

- start time delay: 0-120 seconds
- transfer time delay: 0-1800 seconds
- retransfer time delay: 0-1800 seconds
- time delay generator fail: 0-8 seconds
- stop time delay: 0-1800 seconds
- time delay neutral: 0-120 seconds
- time delay voltage unbalance: 10-30 seconds
- voltage unbalance: 5% - 20%
- voltage & frequency sensing of both sources
    50-97% D.O. undervoltage
    54.0-58.2Hz D.O. underfrequency
    105-120% overvoltage
    61.8-66.0Hz overfrequency
Exerciser Clock 1, 7, 14, 28 day interval at no load or load
0-600 minute run-time
Position Indication (4)LEDs and LCD Display on door
Spare Auxiliary Contacts (2) Form C (1 Emergency, 1 Normal)
Battery Charger not included (order separately if required)
UL Withstand & Closing Ratings 35,000 amps when used with any circuit breakers
Higher when used with specific Cutler-Hammer breakers
Lug Capacities (1)600MCM to 4/0 AWG per pole or
(2)250MCM to (2)1/0 AWG per pole
Nominal Dimensions (H x W x D) 48.7" x 25.3" x 13.9" with door closed

1) The start time delay prevents nuisance generator starts during momentary utility power variations; transfer time delay allows generator set to stabilize before load is applied; retransfer delay prevents needless power interruption if return of utility power is momentary; stop delay allows gradual generator set cool down; undervoltage sensing of utility supply provides reliable starting of generator set during brownout conditions.
2) This switch is NOT service entrance rated.  The NEC normally requires a separate service entrance rated disconnect between this switch and your utility meter.
3) The ATC contactor comes standard with 2 or 3 power poles to switch the hot leads of a single phase or 3 phase system.  It does NOT switch the neutral, which is acceptable in most areas of the USA.  See article 250.20 of the 2002 NEC.  If there are special requirements in your area that require switching the neutral (as dictated by local codes or electrical inspectors) you must specify an additional power pole using the dropdown menu below when ordering.
4) This switch provides a single isolated contact for controlling the genset.  The contact closes when the genset is to start and run. 


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Automatic Transfer Switch Service Entrance Disconnect (required if power company meter is directly upstream of ATS location)

Item Number: ATC3C2-400
Price: $2,901
Price last updated 5/16/2017
Shipping Weight: 260 lbs.
This item normally ships in approximately 2-4 weeks or less.

NEMA 1 240V

Item Number: DG325UGK
Price: $796
Price last updated 1/16/2009
Shipping Weight: 70 lbs.
This item normally ships in approximately 1 week or less.

NEMA 1 600V

Item Number: DH365UGK
Price: $1,002
Price last updated 1/16/2009
Shipping Weight: 151 lbs.
This item normally ships in approximately 1 week or less.

NEMA 3R 240V

Item Number: DG325URK
Price: $1,233
Price last updated 1/16/2009
Shipping Weight: 151 lbs.
This item normally ships in approximately 1 week or less.

NEMA 3R 600V

Item Number: DH365URK
Price: $1,304
Price last updated 1/16/2009
Shipping Weight: 151 lbs.
This item normally ships in approximately 1 week or less.

Neutral Kit (req'd for service entrance rating)

Item Number: DS400NK
Price: $166
Price last updated 1/16/2009
Shipping Weight: 10 lbs.
This item normally ships in approximately 1 week or less.




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