Corrente p/ disjuntor

This calculator determines the electric current required to size a circuit breaker for single-phase electrical installations. It uses the formula I = P / (V · cosφ), where P is the circuit power in watts, V is the voltage in volts, and cosφ is the equipment's power factor. The calculated current indicates the maximum amperage the circuit breaker must withstand to protect against overloads.

To use the calculator, input the values of power, voltage, and power factor. The result provides the current in amps, which should be compared to the circuit breaker's specifications. This calculation is essential for residential, commercial, and industrial projects, especially when sizing circuits for appliances like water heaters, ovens, or motors.

The power factor is critical for inductive loads (e.g., motors), as low values increase the required current. For three-phase applications, use I = P / (√3 · V · cosφ). Always round the result to the nearest commercial circuit breaker size (e.g., 15A, 20A, 30A).

Common mistakes include omitting the power factor or using phase voltage instead of line voltage. Check equipment specifications and consult an electrician for complex installations, such as high-power circuits or industrial environments.