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Generac-ATS-Three Phase-100A-NEMA 3R

100 Amps; NEMA 3R Outdoor Enclosure

The 100-amp RTSN-Series 3-phase auto transfer switch is offered in these voltages: 208, 240, and 480. This is non-service rated, open-transition model. For use with liquid-cooled Guardian, QuietSource, and Commercial-Series standbys from 22 to 150 kilowatts. Silver-plated main contacts resist welding and sticking. Fast, positive connections for 160 millisecond transfer times. Indoor/outdoor NEMA 3R housing.

  • Important: See the shipping tab for information regarding our liftgate option, and residential versus commercial deliveries. At present, because T-Rex is shipping Generac products direct from the company's Wisconsin-based factory, any
  • residential delivery weighing in excess of 80 lbs will require the $75.00 liftgate shipping option. Shipments to commercial addresses (non-residences) remain exempt from liftgate charges unless specified by customer.

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    Model:  RTSN100X3
    Price:  $751.50
    Available Options:
    3-Phase Voltage:
    Delivery: 208/240-Volt:
    Delivery: 480-Volt:

    Model Specs

    Manufacturer: Generac
    Model #: RTSN100X3
    Model Description: 100-Amp RTS Three-Phase Automatic Transfer Switch (Outdoor Model)
    Rating: Open
    Built-In Load-Shedding Capability?: No
    Price (208/240-Volt): $751.50
    Price (480-Volt): $848.00

    Voltage (AC): 120/208
    Voltage (AC): 120/240
    Voltage (AC): 277/480
    Phase: Three
    Frequency: 60 Hz
    Maximum Generator kilowatts: NA
    Rated Amps: 100
    Maximum Generator Amps: NA
    Maximum Withstand Amps: 10000 (208-Volt)/14000 (240/480-Volt)
    Number of Poles: 3
    Number of Circuit Breakers: NA

    Power Management
    Startup Delay (After Power Interruption): Adjustable (10 - 30 Seconds)
    Engine Warm-Up Duration: 5 Seconds
    Engine Cool-Down Period: 60 Seconds
    Exerciser: Every 7 Days (12 Minutes)
    Minimum Run Time: NA
    Return to Utility (Retransfer): 15 Seconds
    Voltage Sensing (Normal Power Source): Yes
    Voltage Sensing (Standby Source): Yes
    Frequency Sensing (Standby Source): No

    UL Listing: Yes
    Weight (208-Volt): 20 lbs
    Weight (240-Volt): 53 lbs
    Weight (480-Volt): 105 lbs
    Dimensions - Inches (208/240-Volt): 7.1(Depth) x 20.2W x 24.1H
    Dimensions - Inches (480-Volt): 10(Depth) x 24W x 36.1H
    Cabinet Type: NEMA 3R

    Additional Information
    Compatible with Generac liquid-cooled generators
    Non-service rated; open transition
    Silver-plated main contacts
    100% equipment rated
    Rated for all classes of load, inductive and resistive
    Dual coil design
    160 millisecond transfer time

    Spec Sheet Pdf

    Generac RTS-Series 3-Phase ATS 100-400A Spec SheetGenerac RTS 3-Phase ATS 100-400A Spec Sheet


  • 24-month manufacturer's limited warranty

  • Shipping

    NOTE: all Generac residential shipments weighing in excess of 80 lbs require our $75.00 liftgate shipping charge (by Generac policy). Liftgate service is optional for commercial deliveries. This policy change does not apply to shipments from other manufacturers.
    The T-REX Free Shipping Pledge:


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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.