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Asco 300-600A-1Ph-Open Transition ATS-NEMA 3R

…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. This 600-Amp 1-phase model is open-transition rated; this means that it does not harbor an internal circuit breaker for disconnecting the utility or main power source before backup generator power is applied. An electrician handling installation of the switch will need to supply that breaker, however this is a simple and routine procedure. We recommend this switch for the following Winco standby generators: models PSS21-3, PSS30LS-3, 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:  300/600-3O
    Price:  $5,397.50
    Available Options:
    Lift Gate Shipping Option?:
    Residential Shipment?:

    Model Specs

    Manufacturer: Asco Power
    Model #: Series 300/600-3O
    Model Description: 600-Amp 1-Phase Automatic Transfer Switch (Outdoor Model)
    Rating: Open
    Built-In Load-Shedding Capability?: No
    Price: $5,397.50

    Voltage (AC): 120/240
    Phase: Single
    Frequency: 60 Hz
    Maximum Generator kilowatts: NA
    Rated Amps: 600
    Maximum Generator Amps: 600
    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: 680 lbs
    Dimensions (Inches): 17(Depth) x 24W x 63H
    Cabinet Type: NEMA 3R

    Spec Sheet Pdf

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


  • 18-month limited warranty

  • Shipping

    Asco transfer equipment is shipped either from T-Rex facilities in Utah, or from Asco factory locations in New Jersey or Texas, via standard UPS ground. In all instances, T-Rex makes no profit on shipping. For every accessory we sell, our customers will be charged only what Asco or another vendor has charged us. Shipping to your location will be calculated during checkout. Please allow up to 10 business days for delivery.


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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.