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Asco 185-100A-1Ph-Open Transition ATS-NEMA 3R

ůSuper Residential/Light-Duty Automatic Switch

Asco's 185-Series automatic transfer switches are rated for residential and light-duty use. For commercial purposes, consider the heavier 300 Series. This 100-amp model is an open transition; open transition means that the switch 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 PSS8B, PSS12H, PSS15B, PSS21-3, PSS30LS-3, PSS40LS-3, PSS60LS-3, and PSS90LS-3. Model comes with a weatherproof enclosure that can be mounted indoors or out. 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:  185/100-3O
    Price:  $875.50
    Available Options:
    Residential Shipment?:
    Strip Heater For Cold Climate:

    Model Specs

    Manufacturer: Asco Power
    Model #: Series 185/100-3O
    Model Description: 100-Amp Single-Phase Transfer Switch (Outdoor Mount/2-Wire Start)
    Rating: Open
    Built-In Load-Shedding Capability?: No
    Price: $875.50

    Voltage (AC): 120/240
    Phase: Single
    Frequency: 60 Hz
    Maximum Generator kilowatts: 24
    Rated Amps: 100
    Maximum Generator Amps: 100
    Maximum Utility Amps: NA
    Number of Poles: 2
    Number of Circuit Breakers: NA

    Power Management
    Startup Delay (After Power Interruption): 3 Seconds
    Engine Warm-Up Duration: 15 Seconds
    Engine Cool-Down Period: 1 Minute
    Exerciser: 20 Minutes Every 14 Days
    Minimum Run Time: NA
    Return to Utility (Retransfer): 5 Minutes
    Voltage Sensing (Normal Power Source): No
    Voltage Sensing (Standby Source): No
    Frequency Sensing (Standby Source): Yes

    UL Listing: Yes
    Weight: 49 lbs
    Dimensions (Inches): 10(Depth) x 16W x 24H
    Cabinet Type: NEMA 3R

    Spec Sheet Pdf

    Asco 185-Series BrochureAsco 185-Series Brochure
    Asco 185-Series Operation ManualAsco 185-Series Operation Manual


  • 18-month limited warranty

  • Shipping

    Asco transfer equipment is shipped via standard 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.