Main Parameters for Selecting Patch Fuses
Main Parameters for Selecting patch fuses
1. Voltage Ratings:
The voltage rating of the fuse must be greater than or equal to the high voltage of the disconnected circuit. Due to the very low resistance of the fuse, the voltage rating of the fuse becomes important only when the fuse attempts to blow. After the fuse element melts, the fuse must be able to quickly disconnect, extinguish the arc, and prevent the open circuit voltage from triggering the arc again through the disconnected fuse element.
2. Current Ratings:
The current rating indicates the current carrying capacity of the fuse under a set of test conditions. Each fuse will indicate the current rating, which can be marked with numbers, letters, or colors. The meaning of each marker can be found in the product data table.
3. Breaking Capacity/Interrupting Rating:
The fuse must be able to disconnect the faulty circuit without damaging the surrounding circuit. Breaking capacity refers to the current value at which a fuse can safely open a circuit without damage at rated voltage. The breaking capacity of a fuse must be equal to or greater than the possible fault current in the circuit.
4. Melting Integral:
The fusing integral of a fuse is the energy required to fuse the fuse element of this fuse, also known as the fusing value I2t. The structure, material, and cross-sectional area of the fuse element determine this value. Each series of fuses uses different materials and component configurations based on their rated current values, making it necessary to determine the I²t of each fuse.
Usually, in DC circuits, a fault current of 10 times the rated current is used to disconnect the fuse in an extremely short time, and a very accurate I²t is measured using a high-speed oscilloscope and integration program.
Fig.1
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