Which motors can be left without (or are not suitable for) overload protection

2009-03-15View Original

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1) For motors that operate for short periods of time or in intermittent cycles, it is difficult to set the parameters when using traditional bimetallic switches; therefore, overload protection may not be necessary. Typical examples include various electric valves (some of which have built-in overload protection). (2) Motors with a rated power of not more than 3 KW that are not prone to overload may not be equipped with such a device. (3) Sudden power loss can cause greater damage to the motor than overload conditions; therefore, overload protection devices that are designed to cut off the main power supply should not be installed in motors such as fire pumps and fire fans.

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Which motors can be left without (or are not suitable for) overload protection

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