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Zenith 100A 120-240V 3-Phase Outdoor Automatic Transfer Switch

120/240-Volt 3-Phase Outdoor-Mount Residential Switch

The GE/Zenith ZTX100-17O is a 3-phase light-duty automatic transfer switch rated at 120/240 volts. Enclosure is a weatherproof NEMA 3R model that can be mounted indoors or out. All of T-Rex's Zenith ZTX switches are open transition; this entails that the switch does not harbor a built-in circuit breaker for disconnecting utility power before backup power is applied. An electrician who installs the ZTX switch will need to supply an external breaker for safety reasons, however this should be an inexpensive and routine matter. T-Rex recommends this 100-amp 3-phase ZTX100-17O switch for Winco standby-generator models: PSS21-17, PSS30LS-17, PSS40LS-17, PSS50LS-17, PSS60LS-17, and PSS90LS-17. 1-year warranty. Standard monitoring of backup source frequency and volts. Optional NEMA 4 and NEMA 12 enclosures - call us for details.

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

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    Model:  ZTX100-17O
    Price:  $2,002.00

    Model Specs

    Manufacturer: GE Zenith
    Model #: ZTX100-17O
    Model Description: 100-Amp 3-Phase 120/240-Volt Transfer Switch (Outdoor Model)
    Rating: Open
    Built-In Load-Shedding Capability?: No
    Price: $2,002.00

    Voltage (AC): 120/240
    Phase: 3
    Frequency: 60
    Maximum Generator kilowatts: NA
    Rated Amps: 100
    Maximum Generator Amps: 100
    Maximum Utility Amps: NA
    Number of Poles: 3
    Number of Circuit Breakers: NA

    Power Management
    Startup Delay (After Power Interruption): 5 Seconds
    Engine Warm-Up Duration: 20 Seconds
    Engine Cool-Down Period: 5 Minutes
    Exerciser: 10 Minutes/Every 7 - 28 Days
    Minimum Run Time: NA
    Return to Utility (Retransfer): 5 Minutes
    Voltage Sensing (Normal Power Source): Yes
    Voltage Sensing (Standby Source): Yes
    Frequency Sensing (Standby Source): Yes

    UL Listing: Yes
    Weight: 41 lbs
    Dimensions (Inches): 8(Depth) x 18W x 18H
    Cabinet Type: NEMA 3R

    Additional Information
    Can be set to exercise generator with or without load
    In addition to NEMA 1 and NEMA 3R, model available in NEMA 4 and NEMA 12 enclosures - call for details
    Great choice for residential and light-commercial applications
    Frequency and voltage monitoring of emergency power source
    Double throw, mechanically-interlocked contactor

    Spec Sheet Pdf

    Zenith ATS Spec SheetZenith 3-Phase ATS Spec Sheet
    Zenith ATS Operation ManualZenith 3-Phase ATS Operation Manual


  • 1-year warranty

  • Shipping

    Zenith transfer equipment is shipped from either T-Rex facilities in Utah, or from a GE factory location in Eastern or Central United States. Method utilized is standard UPS ground. T-Rex Generators makes no profit on shipping. For every accessory we sell, our customers are charged only what GE has charged us. The freight charge 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.