A Proposed Method of Rating Fuses for Pulsed Service

For many applications the present standard I2t rating method for coordinating fuses is not satisfactory. Examples include the protection of solid-state devices without large safety factors, and high-voltage dc circuits. Therefore, an improved engineering and rating procedure for the application engineer is needed for such interrupting devices. This paper examines the problem and suggests a method for obtaining the arc voltage as a function of the circuit parameters and applying ratings based on this. The procedure is checked against test results for four types of fuses.