Current fuses are what we are used to, and its official name is "fuse." Current fuses, in fact, is a piece of wire that can be blown. The resistance inside this wire is much higher than that in a normal wire. The principle is that when a short circuit occurs in the circuit, excessive current will pass through the fuse. At this time, the temperature of the fuse will increase and the fuse will be blown. It also cuts off the power supply and prevents further damage to the current. Next Xiaobian introduced current fuse parameters and current fuse standards for everyone. Current fuse parameters 1, rated current Also known as the nominal working current of the fuse, codenamed In, the rated current of the fuse is determined by the manufacturing department under laboratory conditions. The rated current is usually 100mA, 200mA, 315mA, 400mA, 500mA, 630mA, 800mA, 1A, 1.6A, 2A, 2.5A, 3.15A, 4A, 5A, 6.3A, etc., but the company generally takes the customer's needs and actual The purpose is to provide the rated current of various fuses. 2, rated voltage The nominal working voltage of the fuse, the code is Un, the standard voltage rating of the general fuse is 32V, 60V, 125V, 250V, 300V, 500V, 600V. Fuses may be used at voltages not greater than their rated voltage, but are generally not approved for use in circuits where the voltage of the circuit is greater than the rated voltage of the fuse. 3, voltage drop For the rated current of the fuse, when the fuse reaches the thermal equilibrium, that is, when the temperature stabilizes, the voltage at both ends is measured, and the code is Ud. Because the voltage drop across the fuse has a certain impact on the circuit, there is a clear specification for voltage drop in the European regulations. 4, fuse resistance It is generally classified into cold resistance and thermal resistance. The cold resistance is the resistance value measured at a test current of less than 10% of the rated current at 25°C. The thermal resistance is the conversion of the full rated current value to the measured voltage drop of the test current. The calculation formula is R heat = Ud/In. Usually the thermal resistance is larger than the cold resistance. The resistance value of the fuse provided by our company is the cold resistance value and is only used as a reference. 5, overload current Overcurrent refers to the current flowing in the circuit higher than normal operation. If the overload current cannot be cut off in time, it may cause damage to other devices in the circuit. Short-circuit current refers to the current generated by partial or total short-circuit in the circuit. The short-circuit current is usually large and larger than the overload current. 6, the melting characteristics That is, the time/current characteristics (also called Ampere-second characteristics). There are usually two methods of expression, namely IT charts and test reports. The IT diagram is a curve in which the fuse is connected to the average melting time point of the fuse under different current loads in a coordinate system in which the load current is the x coordinate and the melting time is the y coordinate. Each type of fuse has a corresponding curve that represents its fusing characteristics. This curve can be referenced when selecting a fuse. The test report is the test data record of the test performed according to the test items required by the standard. Our IT charts and test reports are based on the data measured under the conditions of the experiment. Under the actual conditions of use, the curves or test reports will be different. Therefore, the test reports and IT charts provided by our company For reference only. 7, breaking ability Also known as the rated short-circuit capacity, that is, the maximum current value of the fuse at which the fuse can be safely disconnected (AC is RMS). It is an important safety indicator for the fuse. The code for breaking capacity is Ir. 8, melting heat energy That is, the energy required to melt the fuse, its code is I t, read as A2Sec. It is the product of the square of the corresponding current and the fuse-time when the fuse is disconnected within 8ms or less. The limitation time is within 8ms to make all the heat generated by the fuse to be used to blow off the heat. It is a constant for each different fuse component. It is a parameter of the fuse itself and is determined by the design of the fuse. 9. Temperature rise The temperature rise refers to the difference between the temperature at which the fuse reaches a stable temperature and the temperature before energization at a predetermined current value (100% In in UL and 115% In in sun gauge). Current fuse standard Current fuses are generally classified according to their safety standards: UL/CSA specifications, IEC specifications, and so on. In the normal case of the UI specification, the fuse is capable of maintaining operation for more than 4 hours, is not within the range of 110% of the rating of the fusing current, and cannot exceed the rated current of 110%. According to the IEC regulations, the fuse can be maintained for more than one hour, and the rated current of the fuse current will not be 150%. The rated current of 150% cannot be exceeded. Editor's summary: The current fuse parameters and current fuse standards are introduced here, and we hope to be helpful to everyone. 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