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Generac Nexus Smart Switch™ - 200 Amp Automatic Transfer Switch

Generac Guardian Electric Generators and Accessories
Model: RTSX200A3
(Based on expert analysis, manufacturer ratings and customer reviews)
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5
2 Reviews
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Amp Rating
200 @ 240 Volts (Single Phase)
Load Mgmt.
Nexus™ Automatic Transfer Switch

Compatible With Generac Nexus™ or Generac R200 Controllers
Leverages digital load management (DLM) technology
Ability to manage 2 A/C units with no additional hardware
Intelligently manage 4 more loads w/ additional DLM modules
DLM Module P/N: 5937 (Sold Separately)

NEMA 3R Indoor/Outdoor Rated
Aluminum, wall mountable weather-proof enclosure
Electrostatically applied and baked powder paint (Gray)

Tech Spec Summary:
Load transition type: Open Transition
Withstand rating: 10,000 Amps
Lug range: 400MCM - #4

Standard Installation
Also requires a sub-panel for overload protection

For Use With Generac Generators Only
Product Specs
120/240 Single-Phase
60 Hertz
Rated Amps
200 @ 240 Volts (Single Phase) Amps
Transfer Switch Style
Standard Installation
ATS Load Prioritizing
ATS Load Shedding
ATS Poles
2 Poles
ATS Service Disconnect
Max Utility Input
200 Amps
Max Generator Input
200 Amps
Maximum Wattage
48000 Watts
UL Listed
Made in USA
20 Pounds
Product Length
20 Inches
Product Width
15 Inches
Product Height
8 Inches
Consumer Warranty
1 Year
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How To Library
  7 Questions
Q: i just purchased a gardian 7000kw stand by generator,i need the automatic transfer smart electric pannel is 200 amp which is applicable for whole house,thanx
by Tim Halpin from New York on May 13, 2013

A: For whole house applications where the switch is mounted immediately after the electrical meter a service disconnect model is required so it meets local codes.

Generac offers their RTSY200A3 switch that has a built-in service disconnect.

Generac RTSY200A3

Note: Typically a 7000 watt generator does not have the capacity to handle an entire homes electrical requirements.

We recommend consulting with a certified electrician who can do your wattage calculations for proper sizing or switch needs.

by Mike, Product Expert

Q: I have a 20 kw and I need a 200 amp switch for whole house. I need 120/240v single phase. Will a RTSD200A3 work?
by Eric Desselle from Texas on February 11, 2013

A: Depending on the type of installation, the RTSD200A3 would be an applicable transfer switch. This is of course is only going to be compatible with Generac generators that are equipped with the current Nexus controllers.
by Mike, Product Expert

Q: i bought a generac 12.5kw came with 100 amp auto switch. electrician told me to purchase a 200 amp switch for whole house install. what switch will work for outdoor app?
by Rob Fristoe from Washington on October 02, 2012

A: Any of their switches with the model number ending in the number 3 are NEMA 3R rated for outdoor.

Whole house installations require a service disconnect so the switches that are RTSD models include the service disconnect.

We recommend you double check the model you select with your electrician prior to purchasing.

by Mike, Product Expert

Q: Hi Jim,

I have two 200 amp panels and would like to do whole house standby. My primary concern is a 5 ton AC/heat pump that is set as the primary heat source if over 40 degrees outside. I can easily run on aux heat (gas furnace) but I'm not sure now to exclude the heat pump if the whole panel is wired. I would like to save costs and do a 10kw generator if possible. Should i do one panel with a dedicated 16 circuit and the other panel with a smart switch?

by Scott from Washington on January 25, 2012

A: A 10kW generator will definitely not be large enough for a home with 400A incoming service especially if you have a heat pump system.

You also cannot cross a 16 circuit load center type transfer switch with a smart circuit type transfer switch. It would create major control issues with the generator. You could do 2 smart switches that work as a master and slave but the generator needs to be large enough for your application and a 10kW will not do it.

Proper sizing of the generator is crucial to the success of any generator installation and requires a good working knowledge of electricity and its characteristics, as well as the varying requirements of the electrical equipment comprising the load. A certified electrician should be consulted for proper sizing and installation of any generator.

When analyzing the electrical load, consult the manufacturer’s nameplate on each major appliance or piece of equipment to determine its starting and running requirements in terms of watts, amps and voltage.

When choosing the generator output select a rating that is approximately 20 to 25% higher than the peak load (for example, if the load is about 8 kilowatts, select a 10 kW generator).

A higher rated generator will operate comfortably at approximately 80% of its full capacity and will provide a margin of flexibility if the load increases in the future.

by Mike, Product Expert

Q: Jim, can a Nexus Smart Switch or LTS be used with a Generac portable gasoline generator (i.e. 10kw) or do they only work with the standby propone generators?
by Mark from New York on September 24, 2011

A: The Nexus smart switches and/or the LTS switch can only be used with Generac standby generators. They CANNOT be used with Generac portable generators.
by Mike, Product Expert

Q: Jim, I want to install a weatherproof transfer switch to control a whole house they have an existing 200 amp 240 volt main service. I need to install a generator and transfer switch outside to handle the all branch circuitry. What do you suggest so i will have no call back problems?
by Voltology / Kent from Illinois on February 20, 2011

A: All of the Generac transfer switches we offer are specific to Generac generators and only operate together. For a whole house application, when using a Generac generator, you would need transfer switch model RTSD200A3 which is a NEMA 3R outdoor transfer switch and includes an internal service entrance switch. This switch is packaged with the Generac 20kW Guardian home standby system, model 5875 and the best model whole home applications as long as the wattage needs are verified.

MODEL 5875

by Mike, Product Expert

Q: What is the difference between the Generac Nexus Smart Switch (100 Amp) automatic transfer switch for $349 and the Generac Nexus Smart Switch (100 Amp) automatic transfer switch (Service Entrance) for $499?

Thank you for your time and consideration.

by Cecil Camune from Illinois on January 29, 2011

A: The "Service Entrance" type automatic transfer switch has a built in shut off switch to power can be turned off to perform service on the generator without backlash from utility power. This type of switch is normally required by code to be installed if used in a whole house application and mounted between the meter and electrical panel being powered.

The "Standard" type automatic transfer switch does not include this service entrance feature and is normally installed when the generator is powering a sub-panel.
by Mike, Product Expert

Generac Guardian RTSX200A3 Reviews & Ratings
2 Reviews  Sort by 
Silver Spring, MD
Purchased from Electric Generators Direct
Purchased 3/4/13
5 out of 55 out of 55 out of 55 out of 55 out of 5
Transfer Switch
I received my transfer switch very quick 4 a great price & a quality product. Thank You
Was this review helpful?
Plaquemine, LA
Purchased from Electric Generators Direct
Purchased 9/9/12
Total Reviews
2 Reviews
5 out of 55 out of 55 out of 55 out of 55 out of 5
Generac Backup Power
Living in rural South Louisiana, 60 miles from the Gulf of Mexico as the crow flies, hurricanes and thunderstorms are just a way of life. I purchased the Generac Guardian for a whole-house backup power supply.

EGD charged a fair price and shipped on time, and follow up communication from Electric Generator’s Direct insured complete satisfaction.

Now for the one NEGATIVE point: bad design for ease of connecting electrical leads to generator main breakers. It's a small area that’s... more
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Shop for the Generac Nexus Smart Switch™ - 200 Amp Automatic Transfer Switch at Electric Generators Direct. Research Generac Guardian 696471607505 automatic transfer switch online. Find Generac Guardian RTSX200A3 automatic transfer switch & RTS Series 200 Amp ATS features and specifications.