The selectivity limit current is the value at which the let-through energy I 2 t of the circuit-breaker exceeds the pre-arcing I 2 t of the fuse (curve or value provided by the manufacturer).. ... A typical fuse time-current curve is shown below. It also contains equation parameters for E-speed, T-speed, Tap, Main, IEEE, and IEC curves. The I 2 t characteristic of the short time function determines the delay type. Replacement is must after completed operation. Fuse Time Current Curve. A fuse’s time-current characteristics can help. TC curves… Circuit breaker characteristic curve doesn’t shift. This is similar to the long time function except with a much faster delay. The grey shaded area is the point where the fuse is designed to operate. It is related to the let through energy I 2 t characteristics.. Characteristic Curve: Fuse characteristic curve shifts because of the ageing effect. and other fuses. Replacement & post-operation: Fuse can be used only once per operation as it is self destructive. https://electrical-engineering-portal.com/fuse-characteristics-protection-circuits Kearney offers six types of fuse links with a wide range of time-current characteristics (refer to Table 1). The higher the ratio, To start our discussion on common overcurrent protection devices, let us review the basic considerations of a coordination study. In fact a 13A fuse will allow a current of 20A to pass indefinitely without blowing. I 2 t IN will result in an inverse-time delay that resembles the time/current characteristics of fuses. Figure 3. The speed ratio of all fuse link sizes 100 A and below is the ratio between the current that melts the fuse in 0.1 seconds to the current that melts the fuse in 300 seconds. MICRO3 Fuse Time-Current Characteristics 3 5 7.5 10 15 Time-Current Characteristic Curves Blade Fuses Dimensions Dimensions in mm Temperature Rerating Curve *Component Level Temperature = the maximum ambient temperature that a single fuse will survive. The time-current characteristics of fuses are affected by ambient temperature. Understanding overcurrent protection device characteristics is very important in a protection coordination study. Cable Damage Curves: Cable damage curve shows that how much current a cable can carry without insulation damage and for how long it … BASIS-These fuse links are tested in accordance with the ... than 200% of fuse-link ampere rating, and the minimum melting and total clearing curves are based on tests starting with the fuse link at an ambient temperature of 25°C (77°F) and no initial load. For example, Littelfuse’s 383 series - TR5® time-lag 300V rated fuses have time-current characteristics as shown by the below graph. 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