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Asco 300-260A-3Ph-Open Transition ATS-NEMA 1

ůSelect the Voltage You Need When Placing Order

Asco's commercial-grade 300-Series 3-phase automatic transfer switches are available from T-Rex in three voltages: 120/208, 120/240, and 277/480. Be sure to select the proper voltage for your application during checkout. Prices do not change based on voltage choice. The Asco 300 switches we offer are open transition; an open-transition switch does not contain its own built-in circuit breaker to disconnect utility power before backup power is employed. For safety reasons, the electrician handling installation of the switch must supply an external breaker, however this should be a routine, inexpensive procedure. We recommend this 260-amp automatic transfer switch for the following Winco standby generator models: the PSS21-4, PSS21-17, PSS21-18, PSS30LS-4, PSS30LS-17, PSS30LS-18, PSS40LS-4, PSS40LS-17, PSS40LS-18, PSS50LS-4, PSS50LS-17, PSS50LS-18, PSS60LS-4, PSS60LS-17, PSS60LS-18, PSS90LS-4, PSS90LS-17, and PSS90LS-18.

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

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    Model:  300/260-19I
    Price:  $2,456.50
    Available Options:
    Water-Resistant Cabinet?:

    Model Specs

    Manufacturer: Asco Power
    Model #: Series 300/260-19I
    Model Description: 260-Amp Three-Phase Automatic Transfer Switch (Indoor Model)
    Rating: Open
    Built-In Load-Shedding Capability?: No
    Price: $2,456.50

    Voltage (AC): 120/208, 120/240, 277/480
    Phase: Three
    Frequency: 60 Hz
    Maximum Generator kilowatts: NA
    Rated Amps: 260
    Maximum Generator Amps: 260
    Maximum Utility Amps: NA
    Number of Poles: 3
    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: 120 lbs
    Dimensions (Inches): 13(Depth) x 18W x 48H
    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

    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.