Transformer Current Calculator

Determine the current (I) that will pass through the primary winding to select an appropriate circuit breaker

When connecting a transformer to an electrical power source, it is important to determine the current that will flow through its primary winding. This information is necessary to select a circuit breaker with an appropriate current rating to ensure that it can handle the transformer’s operation without tripping. Use this convenient online transformer current calculator to determine the current flow (I) in the transformer. Current is a measure of the rate at which electric charge flows and is crucial for ensuring proper operation and safety.

Power Rating
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    3 Number of calculations
    I = \frac{P}{V}


    • I = Current
    • P = Power Rating
    • V = Voltage