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Asco 300-1000A-1Ph-Open Transition ATS-NEMA 1

…Ideal Switch for Selected-Circuit 1-Phase Backup

Asco 300-Series automatic transfer switches are heavy-duty commercial-grade models that can be used for both commercial and residential purposes. T-Rex's 1000-Amp 1-phase Asco 300 is open-transition rated; open transition means that it does not contain a built-in circuit breaker to disconnect utility power before backup power is employed. For safety reasons, the electrician handling installation of the transfer switch will need to supply an external breaker, however this is an easy, routine procedure. We recommend this switch for the following Winco standby generators: models PSS40LS-3, PSS60LS-3, and PSS90LS-3. Standard 18-month warranty. Optional extended warranties available at checkout (see Accessories tab for details).

  • Important: Please see the shipping tab for information regarding the freight on generator accessories.

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    Model:  300/1000-3I
    Price:  $7,633.00
    Available Options:
    Lift Gate Shipping Option?:
    Residential Shipment?:
    Water-Resistant Cabinet?:

    Model Specs

    Manufacturer: Asco Power
    Model #: Series 300/1000-3I
    Model Description: 1000-Amp Single-Phase Automatic Transfer Switch (Indoor Model)
    Rating: Open
    Built-In Load-Shedding Capability?: No
    Price: $7,633.00

    Voltage (AC): 120/240
    Phase: Single
    Frequency: 60 Hz
    Maximum Generator kilowatts: NA
    Rated Amps: 1000
    Maximum Generator Amps: 1000
    Maximum Utility Amps: NA
    Number of Poles: 2
    Number of Circuit Breakers: NA

    Power Management
    Startup Delay (After Power Interruption): Adjustable
    Engine Warm-Up Duration: Adjustable (0 - 5 Minutes)
    Engine Cool-Down Period: 5 Minutes
    Exerciser: Every 7 Days
    Minimum Run Time: NA
    Return to Utility (Retransfer): Adjustable (Up to 30 Minutes)
    Voltage Sensing (Normal Power Source): Yes
    Voltage Sensing (Standby Source): No
    Frequency Sensing (Standby Source): Yes

    UL Listing: Yes
    Weight: 500 lbs
    Dimensions (Inches): 20(Depth) x 34W x 72H
    Cabinet Type: NEMA 1

    Spec Sheet Pdf

    Asco 300-Series Fact SheetAsco 300-Series Fact Sheet
    Asco 300-Series BrochureAsco 300-Series Brochure


  • 18-month limited warranty

  • Shipping

    This Asco transfer switch is shipped via standard truck freight.


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    T-Rex Generators distributes products from many different standby and portable generator manufacturers at substantially discounted prices. These represented companies include: Asco automatic transfer switches, Briggs & Stratton generators, Winco generators, Generac Generators, GenTran transfer switches, Reliance Controls Transfer Switches, and Zenith automatic transfer switches. T-Rex also carries Honda powered generators which have the same time-tested Honda engines as the substantially more expensive Honda generator brand units.