Why can't I use an international model SU, SUA, SUM, SMT, or SMX series Smart-UPS in North American 208v or 120v environments?

International model testing is based on the primary environments in which it will be used. For example, units used in Europe must be verified according to EC Directives. All Smart-UPS international models can be sold in Europe because it is compliant with EN standards. UL (Underwriters Laboratory) has specific ratings and certifications for 120V models which are never performed on international models. That is, 230V Smart-UPS units would not be tested based on certifications appropriate for North America because the units are intended for overseas usage.


The grounding of an international unit differs from a 120V model. In the international model, there is normal mode surge suppression, but no common mode surge suppression. That is, there are no protective devices between the Neutral to Ground (N-G or the Hot to Ground(H-G) paths; therefore, no Site Wiring Fault Light is present. There is, however, full surge suppression between Hot and Neutral (H-N).

International models do not depend on the ground wire for surge suppression.


International Model Smart-UPS can be identified in several ways:

The box in which it is shipped has a sticker on the outside that indicates 220-240Vac, International Use Only.

The receptacles on the back are IEC320s; an international standard, and there is no input power cord included on the smaller units.

The model name, located on the rear white label, has 'I' as part of the name; for example SUA2200I.