Power Transfer Switches

ASCO 7000 SERIES Power Transfer Switch

ASCO Power Transfer Switches are the standard of the industry. High speed transfer of loads between alternate sources of power, regardless of ampacity, is achieved using a reliable, field-proven solenoid operating mechanism. When combined with a programmable microprocessor controller with keypad and LCD display, they offer the most advanced method of transferring all types of loads, such as motors, electronic drives, UPS’s and microprocessor-based systems.

Best Suited For
  • Construction and Engineering
  • Data Center/Colocation/Hosting
  • Education
  • Government
  • Healthcare
  • Power Generation
  • Retail and Wholesale
  • Telecom
  • Transportation
  • Water Supply/Sewage Disposal
Limited Guardian Warranty


Specifications per model
Ampere Size Pole Count Voltage Enclosure Type
30A - 4000A 2, 3, 4 115 - 600V Type 1, 3R, 3RX, 4, 4X, 12
* To view a specific model product page click on the model name above.


Conventional two-position transfer configuration, plus closed and delayed transition modes of operation.
UL listed to 1008 Transfer Switch Equipment & CSA certified to CSA 22.2 No. 178-1978 Automatic Transfer Switches.
Rated up to 600 VAC, 30 through 4000 amperes.
High withstand and close-on ratings including 30 cycle withstand current rating for optimum flexibility in circuit breaker coordination (600-4000 amperes).


Reliable and field-proven solenoid operating mechanism ensures maximum performance.
Local or Remote serial communication options provide user flexibility.
Standard ground conductor connections.
Protected by a comprehensive 2, 5, or 10 year warranty.

Services & Support


Frequently Asked Questions
How does an ATS function?
An ATS functions as a double-throw switch that connects one of two sources of power to a common load. It has interlocks which provide source to source isolation. The ATS is made up of two core components, a controller and a switching mechanism. The controller monitors both sources of power; if a loss is detected will start a generator and initiate a transfer sequence. When signaled by the controller, the switch mechanism will energize a coil which will move the switch to the alternate source. Once the primary source returns the controller transfers the switch back and shuts down the generator.
How do I contact a service technician?
Contact a local ASCO Power Services representative by calling the toll free hotline (1-800-800-2726), then go to option 2 then 3 on the prompt or connect with any customer service representative. They will transfer you to a local service technician’s office in your area.
What is the Withstand and Closing Rating and which breakers are tested with an ASCO transfer switch?
Refer to Publication 1128 for WCR and tested breakers for ASCO switches.
Is my generator compatible with an ASCO transfer switch, and where do I land my engine start connections?
ASCO 7000 SERIES transfer switches can accommodate any generator brand as long as it is has a 2 wire input engine start signal for automatic engine control. These input wires are connected to the engine start contacts of the transfer switch; which will turn the generator ON and OFF. The engine start contacts are also known as feature 7, which consists of a NC contact that de-energizes (closes) to send an engine start signal, and feature 8, which has of a NO contact that de-energizes (opens) to send an engine start signal. Refer to the switch wiring diagram for the terminal connections.
How do I communicate with the ATS?
The Group 5 controller can communicate via ASCOBusII (ASCO use only) or MODBUS protocol. To communicate with the ATS, you need the optional communication module (Acc.72EE2). This module supports Ethernet and RS-485 connection; which the customer can use to access data for external systems. This module also provides SNMP, email, and webserver capabilities. It serves as a gateway to other devices that will communicate with Group 5.


Sales In USA Change Location
ASCO Power Technologies (Maryland, Southern Delaware, Washington DC and VA) Justin Mitros
Email Contact +1 443 546 3710 Fax +1 703 342 0391
7130 Minstrel Way, Suite 217 Columbia Maryland 20191 USA
Product areas of focus: Transfer Switches, Paralleling Switch Gear, Power Control and Monitoring
Support Change Location
ASCO Power Technologies Global Corporate Office Customer Care
Email Contact +1 800 800 2726 Fax +1 973 966 5709
160 Park Avenue Florham Park New Jersey 07932 USA
Product areas of focus: Transfer Switches, Paralleling Switch Gear, Surge Protective Devices, Load Banks, Fire Pump Controllers, Power Control and Monitoring