An overcurrent protection device for a motor control circuit operating with a motor FLA of 20 amps should be sized for at least __________ amps.

In motor control circuits, overcurrent protection devices, such as circuit breakers or fuses, are crucial for safeguarding motors against overcurrent conditions that can arise during normal operation or due to faults. The Full Load Amperage (FLA) of 20 amps indicates the regular operating current of the motor. According to the National Electrical Code (NEC), the overcurrent protection for a motor should typically be sized based on certain multipliers of the motor's FLA to ensure adequate protection without nuisance tripping.

In most situations, the NEC recommends sizing the overcurrent protective device for a motor at 125% of the motor's FLA when considering continuous operation. In this case, calculating 125% of 20 amps results in 25 amps. Therefore, selecting a device rated at 25 amps or higher meets this requirement, providing proper protection while allowing for the motor's operational characteristics and potential inrush currents during startup.

Choosing a rating of at least 25 amps ensures sufficient headroom for normal fluctuations in motor current without compromising safety, while still allowing for compliant operation under the NEC guidelines. This protection helps to prevent damage to the motor and ensures both the motor and the connected equipment function safely and effectively.