However, 210 to 250-V rated power supplies may not be suitable for European power systems. These are suitable for application on most U.S. Standard power-supply modules rated for 210 to 250-Vac input are also available. If low or high voltage is expected, that fact should be included in specifications for a power supply. Since power system loading and, thus, line voltage varies widely during operation, line voltage for a proposed power-supply application should be checked. And power supplies tend to overheat when subjected to high line voltage.
When connected to a low-voltage line, a regulated power supply may not produce rated dc output voltage. However, line voltage for heavily loaded systems can drop below 105 V, and line voltage for lightly loaded systems or for systems close to utility substations may rise appreciably above 125 V. Most 115-Vac power systems maintain line voltage within that range. Input ratings: Typical power-supply modules are designed and rated to operate with their inputs connected to lines delivering 105 to 125 Vac.
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