GENERAC RXSW400A3CUL Smart Switch 400 Amp Service Rated 120/240 1-Phase, NEMA3R Cul Approved

It's a service rated switch, so it can sit at the service entrance and act as the service disconnecting means rather than being fed downstream of a separate main. That's the whole point of the SE rating on a 400 amp switch: one enclosure at the meter instead of a main panel plus a downstream transfer switch. It is rated 400 amps, 120/240 volt single phase.

No. This is a single-phase 120/240 volt transfer switch, and it's built for single-phase generators running a Generac Evolution or Nexus controller. A three-phase installation needs a three-phase switch instead. Same answer if your generator is another brand with a non-Generac controller: the load management side of this switch talks to the Evolution or Nexus controller, so pairing it outside that family gives up the function you're paying for.

The switch accepts up to 22,000 watts of generator input. Size the standby unit at or below 22 kW on the generator side; the 400 amp rating is about the service it sits on, not how big a genset it will take. If your generator is larger than 22 kW, this isn't the right switch.

Not for up to four HVAC loads. The switch manages four individual air conditioning loads on its own, with no add-on hardware, using digital power technology and a Smart A/C Module that sheds connected loads when generator frequency drops under overload. If you need to prioritize more than those four, or shed non-HVAC loads like a range or a water heater, that's where Smart Management Modules come in alongside it.

Yes, it's built for it. The enclosure is aluminum with electrostatically applied and baked powder paint for extra corrosion protection, rated for indoor or outdoor use, in grey. Aluminum also matters for coastal or high-humidity sites where a painted steel can will chalk and rust at the seams first.

Plan for 48 inches of height, 21.8 inches of width, and 10.1 inches of depth off the wall. That's a tall can, so check your meter height and any soffit or gas meter clearance before you commit to a wall. It weighs 113 pounds, which is a two-person lift onto unistrut or block.

It carries a cUL listing as well as being UL Listed, which is the Canadian side of the listing an AHJ north of the border will look for. The CUL in the model designation is what separates it from the US-only version of the same 400 amp Smart Switch.

The transfer switch ships with its installation hardware and installation instructions in the box. What isn't in the box is the wire, conduit, and any Smart Management Modules you're adding for loads beyond the four HVAC circuits the switch handles itself.

Country of origin on the RXSW400A3CUL is the United States. For a federally funded or institutional spec that asks for domestic origin documentation, that's the value on record for the part.