1. Rated Voltage

2. Rated Current

3. Protective Characteristics

The time-current characteristic (I-t characteristic), also known as ampere-second characteristic, represents the curve showing the relationship between current passing through the fuse element and melting time under specified conditions. It follows an inverse time characteristic: the higher the current, the shorter the melting time.

The I-t curve contains a critical boundary distinguishing melting and non-melting states. The corresponding current is the minimum melting current (critical current IRmin), normally defined as the lowest current capable of melting the fuse element within 1~2 hours. According to fuse design specifications, the element must remain intact at rated current INN, so IRmin shall exceed INN.

4. Rated Breaking Capacity

It stands for the prospective short-circuit current that the fuse can reliably interrupt under specified operating conditions, which is the maximum fault current the fuse can break.

When a short-circuit fault occurs, the fault current will be interrupted after a certain period. If the fuse operates prior to the peak of short-circuit current, current limiting will take effect. Better current limiting performance means higher breaking capacity.