automotive blade fuse specification.What kind of Shenzhen fuse is safe

　　1. How much current can a fuse flow through?

　　The rated current is the current value that Shenzhen fuses can operate for a long time, not the operating current.

　　Due to safety issues related to fuses, they are considered safety devices and must pass relevant certifications before they can be produced and sold.

　　Usually, safety regulations require that the temperature of a fuse should not exceed the allowable value when operating at its rated current. For example, UL specifies that the temperature should not exceed 75 ℃ when operating at 100% rated current.

　　The safety regulations also impose strict requirements on the fusing time when the actual current exceeds the rated current. For example, when a certain specification of fuse is given at 1.5 times the rated current, the fuse can operate continuously for 60 minutes; At 2.1 times the rated current, it can work continuously for 2 minutes; At 2.75 times the rated current, it can work for less than 400ms ($1.7100) and more than 10s; There is also a requirement for fusing time when the rated current is 4 times or 10 times.

　　In addition, UL specification fuses have low overload capacity, so a current reduction (Frf=0.75) is required. For 3A applications, when other characteristics are not considered, at least 4A (3/0.75=4) fuses should be selected.

　　2. How can I work safely?

　　When a fault occurs in the subsequent circuit (such as a short circuit), almost all of the input voltage is applied to both ends of the fuse! This generates a very high current. Will such a large current cause the fuse to continue to conduct and cannot be pulled open? It's completely possible! So, the proposed method for breaking current

　　IEC and UL have different requirements for breaking capacity. Taking IEC 127 as an example, there are the following

　　The low breaking capacity (LBC) fuse must be able to cut off the larger of 35A current or 10 times the rated current

　　The EBC capacity fuse must be able to safely cut off 150A

　　The high breaking capacity (HBC) fuse must be able to safely cut off 1500A

　　Breaking capacity is an important safety indicator for Shenzhen fuses. Therefore, when selecting a fuse, careful consideration should be given to this characteristic and actual testing should be conducted. The large short-circuit current that may occur in the fuse should not exceed the rated breaking capacity of the fuse, ensuring that in the event of a fault or large current in the later stage, the fuse can safely cut off the circuit without causing safety issues.

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