Cummins Onan OTEC 225 Amp 208V Three Phase Automatic Transfer Switch Nema 3R | A040C978
Cummins Power Generation

Cummins Onan OTEC 225 Amp 208V Three Phase Automatic Transfer Switch Nema 3R, Rated Indoor/Outdoor | A040C978

OTEC transfer switches are designed for operation and switching of electrical loads between primary power and standby generator sets.  The switches monitor both power sources, signal generator set startup, automatically transfer power, and return the load to the primary power source once a stable utility is available.

Microprocessor Control:  Easy-to-use, standard control, LEDs display transfer switch status, push buttons allow operator to activate control test, exercise timing and transfer mode.
Programmed Transition:  Open transition timing can be adjusted to completely disconnect the load from both sources for a programmed time period.
Positive Interlocking:  Mechanical and electrical interlocking prevent source-to-source connection through the power or control wiring.
Easy Service/Access: Single-plug harness connection and compatible terminal markings simplify servicing.  Access space is ample.  Door-mounted controls are field-programmable, no tool is required.

Compatible With: Cummins Onan Connect Series 208V Three Phase

UL 1008 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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