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FAQ03066 of Measuring / Motor Protective Relays FAQ

FAQ No. FAQ03066

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Question

Why is the operating value for the overload factor of motors and relays given as "115% of the current setting value"?

Answer



The JEM 1357 standard for Motors and Relays states that the operating value for the overload factor of static protective relays for motors must be in the range of 105% to 125% of the current setting value.

The operating value of OMRON products is 115% of the current setting value, with a ± 10% setting tolerance for the overload factor. This combines to give a range of 105% to 125%, which satisfies the above standard.

Applicable models: K2CM, SE Motor Protective Relay

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