Generac Generator Transfer Switches

Minimize The Lag Time Between Loss Of Utility Power and Start of Auxiliary Power

Generac Generator Transfer Switch

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Generator Transfer Switch

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  • Generac 200AMP Transfer Switch Generator - icon

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Low Price GuaranteeWhat's special about these transfer switches?

  • Once the generator is at full power, the switch will automatically disconnect it from the utility and connect it to the load until your main power is restored
  • Continually monitors voltage from the utility via internal circuit boards to ensure constant power to your building, house or office
  • Prevents feedback to the utility system when the generator is on, preventing fires and other dangers
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Generac offers two types of transfer switches; choose between automatically disconnecting the power from utility before switching to the generator, or manually switching the transfer of power. Available in either 100 or 200 amps, they're a perfect addition for hospitals, office buildings, or homes.

  • Two different types of transfer switches to choose from:
    • Manual, to physically transfer the power from utility to generator
    • Open transition, to automatically shut off power from the utility before turning on the generator
  • Synchronizes different power sources before the power is combined or loads are transferred, for safety
  • The transfer switch will only start the generator when the switch senses no utility power
  • 160 millisecond transfer time for continuous power without delay
  • Part numbers GE-04678 and GE-04635 have a service disconnect switch built in, while part numbers GE-05036 and GE04945 will need to have a service disconnect installed elsewhere prior to installing the transfer switch
  • NEMA 3R rated, so it's safe to use outside in hot or cold climates
  • UL 1008 listed


Part # GE-04678 GE-05036 GE-04635 GE-04945
Amps 100 100 200 200
Voltage 120/240 120/240 120/240 120/240
Open transistion Yes Yes Yes Yes
Enclosure Type NEMA 3R NEMA 3R NEMA 3R NEMA 3R
Withstand Rating (Amps) 14,000 14,000 25,000 25,000
Lug Range 2/0 - #14 2/0 - #14 400 MCM - #4 400 MCM - #4
External Dimensions 24.1" H x 20.2" W x 7.1" D   24.1" H x 20.2" W x 7.1" D  24.1" H x 20.2" W x 7.1" D   24.1" H x 20.2" W x 7.1" D
Weight 53 lbs 53 lbs 53 lbs 53 lbs
Utility Voltage Drop-out <60%
Timer To Generator Start 15 Seconds
Engine Warm up Dely 5 Seconds
Standyby Voltage Sensor 90%
Utility Voltage Pickup >80%
Re-Transfer Time Delay 15 Seconds
Engine cool-down timer 60 Seconds
Excerciser 15 minutes every 7 days
UL 1008 Listed Yes
GE-04678 100 Amps, Open Transition w/ service disconnect 24.1" H x 20.2" W x 7.1" D 53 lbs
GE-04635 200 Amps, Open Transition w/ service disconnect 24.1" H x 20.2" W x 7.1" D 53 lbs
GE-05036 100 Amps, without service disconnect 24.1" H x 20.2" W x 7.1" D 53 lbs
GE-04945 200 Amps, without service disconnect 24.1" H x 20.2" W x 7.1" D 53 lbs
GE-04397 100 AMP NEMA 1 Transfer Switch (Gen. Ready Kit) - Shipping Included - 53 lbs


by PowerReviews
100 AMP NEMA 3R - Transfer Switch

(based on 1 review)

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Reviewed by 1 customer

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New and Improved technology

By Obi Won

from Aguadilla, PR

About Me Tech Savvy

Verified Buyer


  • Compact Size
  • Durable Construction
  • Good Warranty
  • Great Protection


    Best Uses

    • Generac Generator

    Comments about 100 AMP NEMA 3R - Transfer Switch:

    Produck is used on old Generac Generator and with just a few modifications it worked perfectly for my home ussage. [...]

    • Primary use:
    • Personal

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