What are the two standard ampere ratings for a dual-element time-delay fuse for a 10-horsepower motor?

For a 10-horsepower motor, it is crucial to select the appropriate fuse ratings to ensure adequate protection while allowing for the necessary inrush current that occurs when the motor starts. Dual-element time-delay fuses are designed specifically to handle the higher inrush currents without blowing immediately, which is particularly important for motor applications.

The standard ampere ratings that are typically recommended for motor protection are based on the motor's full-load current and the inrush characteristics. A 10-horsepower motor generally has a full-load current around 25 to 30 amps, depending on the voltage level. For this size motor, using a dual-element time-delay fuse, the recommended ampere ratings are typically set at about double the full-load current to accommodate the starting conditions, hence the choice of 80 A or 90 A fuses.

These ratings provide the necessary protection against overloads and short circuits while allowing the motor to start without nuisance tripping. Therefore, selecting a dual-element time-delay fuse of 80 A or 90 A aligns with both the protection requirements and the expected operational characteristics of a 10-horsepower motor.