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For Standby or Gas Portable Generators: (Generac ATS) 400A 1Ph

400 Amps; DLM Technology; Outdoor Mount

This 1-phase 400-amp automatic switch is non-service rated model. Has standard NEMA 3R steel outdoor-mount enclosure. Is designed for use with single-phase Generac standby generators of 60 kilowatts or less. Expect years of reliable service from the UL recognized Generac-manufactured contactor. Unit also harbors digital load-management or DLM technology - allows switch to automatically manage two large AC loads without additional hardware. Purchase of additional DLM control modules will afford switch the capability of managing up to 4 more similar-sized loads without intervention. Warranty 2 years.

  • 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 these charges unless specified by customer.

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    Model:  RTSP400A3-1
    Price:  $1,867.50
    Available Options:
    Type Delivery Preferred:

    Model Specs

    Manufacturer: Generac
    Model #: RTSP400A3
    Model Description: 400-Amp Nexus Smart Switch (Outdoor Model)
    Rating: Open
    Built-In Load-Shedding Capability?: No
    Price: $1,867.50

    Voltage (AC): 120/240
    Phase: Single
    Frequency: 60 Hz
    Maximum Generator kilowatts: 60
    Rated Amps: 400
    Maximum Generator Amps: NA
    Maximum Withstand Amps: 18000
    Number of Poles: 2
    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: 133 lbs
    Dimensions (Inches): 10.06(Depth) x 24.0W x 36.0H
    Cabinet Type: NEMA 3R

    Additional Information
    Engineered for use with 1-phase Generac standbys up to 60 kW
    Non-service rated model
    Able to manage 2 air-conditioning loads with no additional hardware
    Steel NEMA 3R enclosure
    Switch can be operated manually with no power applied
    Will accommodate additional DLM modules
    Works with generator-equipped Nexus controller

    Spec Sheet Pdf

    Generac RTS SmartSwitch 100-400A Spec SheetGenerac RTS SmartSwitch 100-400A 1-Phase Spec Sheet
    Generac DLM Module Spec SheetGenerac DLM Module 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.