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The North American standard NASI/NFPA 70 has clearly stipulated that the protective appliances on the DC side require DC specifications. For the fuse protecting the PV string, the rated current In>=1.56Isc (Isc is the short circuit current of the PV string) is required, and the rated voltage is not ... Read More
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The internal resistance of a fuse is an index that reflects its own power consumption in the circuit. The larger the resistance value, the more power it consumes. For fuses, there are two parameters for detecting this indicator: voltage drop or cold resistance. The voltage drop refers to the reading ... Read More
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The recoverable fuse is essentially a positive temperature coefficient thermistor. It protects the circuit through the positive correlation of the resistance value of the PTC material to the temperature and the sudden change at the Curie temperature point. This principle is completely the same as ... Read More
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Since the resistance value of the fuse itself is very small, and the smaller the better, the voltage drop across the fuse is very small, which is much smaller than the rated voltage of the fuse, so when the fuse works normally, the rated voltage does not matter. practical meaning. The real ... Read More
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A high-quality or suitable fuse should meet at least three requirements: it must be broken when it should be broken, it must not be broken when it should not be broken, and safety must be guaranteed during the breaking process. The first function of the fuse is the protection function, that is, the ... Read More
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In order to ensure that the equipment can continue to operate stably when the instantaneous current is too large, it is necessary to have a product that can improve the protection of the overload current greater than the maximum peak current in the overall overload capacity of the inverter, and can ... Read More
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A complete high-speed fuse is mainly composed of pure silver (99.995%) fuse link, high-strength flame-retardant insulated composite pipe body, conductive connection terminal and internal arc extinguishing quartz sand. After the fuse (fuse) is connected to the electrical circuit, the silver fuse is a ... Read More
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1. Temperature and voltage test: Use the power supply to apply voltage and current on the fuse. The fixed voltage is 220 volts, and the current is supplied from 2 ampel. The temperature increases at the temperature of 2 ampel to 10 ampere current every 4-5 minutes. 2. Follow time test: Use a ... Read More
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Automotive fuse seat refers to the seat of the car fuse. The car fuse seat can be divided into: panel installation of the car fuse seat; Panel installation of automotive fuse seats is mostly used on car electrical appliances, such as automobile power amplifiers, car speakers, car DVDs, etc. The fuse ... Read More
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When selecting DC fuses, the electrical specifications and structural dimensions of AC fuses cannot be simply copied, because there are many different technical specifications and design concepts between the two, which are related to the comprehensive consideration of whether the fault current can ... Read More
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