Cummins Onan RSS 200 Amp Automatic Transfer Switch
Cummins Power Generation

Cummins Onan RSS200-6635 200 Amp Automatic Transfer Switch

The RSS Automatic Transfer Switch combines the dependability and flexibility in a small, economical package.  RSS swtiches are suitable for standby power systems in residential and light commercial applications. RSS transfer switches monitor utility power 24 hours a day and 7 days a week.  When utility power becomes unsatisfactory or fails; the controller signals the generator to start, then transfers the load.  When stable utility voltage returns, the transfer switch will automatically switch electrical load from the generator to utility.  No action is required by the home owner.


200 Amp, Nema 3R (Outdoor Rated)

Fully automatic control, selectable exercise at repeatable intervals.

User-friendly front panel is configurable without special tools.

Integrated, automatic 2 amp regulated battery charger.

Independent break-before-make action

UL Listed


Country Living
Comment by Jim C. on 9th Nov 2014

My Mom and Dad are both in their 80's and live in the country. With the installation of the 6551 I can rest assured that they will never be without power, heat, ac and water. this is a great unit and worked perfectly upon startup. Should have installed this a lot sooner for them.

By the way, my son-in-law also has one for his home. I live in a motorhome or I would have one also.

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