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The division of the derating grade usually has a best derating range. In this range, the reduction of the working stress of the component has a significant improvement in the failure rate, and the design of the device is easy to achieve and does not have to pay a heavy price for the weight, volume and cost of the equipment. The derating level shall be determined based on the reliability requirements of the equipment, the maturity of the design, the cost of maintenance and the degree of difficulty, the safety requirements, and the restrictions on the weight and size of the equipment.

Three derating levels of common mode choke coil are recommended for the best derating.

A) Class I derating Class I derating is the largest derating, with the greatest improvement in the reliability of the use of components. More than its larger derating, usually improve the reliability of components is limited, and may make the equipment design difficult to achieve. Class I derating applies to the failure of equipment to cause casualties or serious damage to equipment and safeguards facilities; The equipment has a high reliability requirements, and the use of new technologies, new technology design; due to cost and technical reasons, equipment failure can not or not maintenance; the system size and weight of the equipment has harsh restrictions.

B) Class II derating Class II derating is a medium differential mode choke coil derating, with a significant improvement in the reliability of the use of components. Level II derating is easier to implement than Grade I derating. Class II derating applies to the following: failure of the equipment may result in damage to equipment and safeguards facilities; high reliability requirements and the use of certain special designs; and higher maintenance costs.

C) The III derating III derating is the smallest derating, the relative benefit of the improvement in the reliability of the use of components, but the absolute effect of reliability improvement is not as significant as Class I and II. Class III derating is the easiest to achieve in design. Class III derating applies to equipment failure and damage and damage to personnel and facilities; equipment with mature standard design.

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