High School

When a buck-boost transformer has a current of less than nine amperes, an overcurrent protection device is allowed to be rated at not more than what percentage of the input current?

Answer :

When a buck-boost transformer has a current less than nine amperes, an overcurrent protection device is allowed to be rated at not more than 125% of the transformer's primary current.

To calculate the rating of the overcurrent protection device:
1. Determine the primary current of the transformer (let's assume it's less than 9 amperes).
2. Multiply the primary current by 125% (or 1.25) to find the maximum allowed rating for the overcurrent protection device.

For example, if the primary current is 8 amperes, the maximum allowed rating for the overcurrent protection device would be 8 x 1.25 = 10 amperes.

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