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July 27,2023

The Matching Function of Self Recovery Fuse and Overvoltage Protection Device in Preventing High Voltage Misconnection Protection

　　　　There are often testing requirements in circuit protection to prevent high voltage misconnections. In general, the self recovery fuse can be used in conjunction with overvoltage protection devices to prevent high-voltage misconnections. When high voltage is mistakenly connected to the circuit, the backend overvoltage protection device will quickly react, generate large currents, and limit the backend voltage to a certain range. The large current generated by the backend overvoltage protection device can quickly activate the , limit the total current of the system, and ensure that the backend overvoltage protection device will not be damaged due to long-term overcurrent.　　The key to this cooperation is that after enduring surges for a long time, can quickly act and limit the circulating current before the backend overvoltage protection device reaches the limit value. Therefore, low current can more effectively cooperate with back-end overvoltage protection devices to prevent misconn

July 07,2023

Rated current of fuse melt.how to test a car fuse with a multimeter

　　　　1. When protecting smooth loads without starting process, such as lighting circuits, resistors, electric furnaces, etc., the rated current of the melt is slightly greater than or equal to the rated current in the load circuit.　　2. The melt current of a single motor that operates for a long time can be selected based on the maximum starting current or according to the following formula:　　IRN ≥ (1.5-2.5) IN　　In the formula, IRN - rated current of the melt; IN - Rated current of the motor. If the motor starts frequently, the coefficient in the formula can be appropriately increased to 3-3.5, depending on the actual situation.　　3. Protecting multiple motors that have been operating for a long time (power supply main)　　IRN ≥ (1.5-2.5) IN max+ Σ IN　　IN max - The rated current of a single motor with the maximum capacity. Σ In other words, the sum of the rated current of the motor.

September 27,2024

Low voltage fuses

　　　　Low voltage fuses play a crucial protective role in power systems and electronic devices.　　Low voltage usually refers to circuit environments with AC voltage of 1000V or below or DC voltage of 1500V or below. In such low-voltage systems, fuses serve as a safety device that can quickly cut off current in the event of abnormal conditions such as overload or short circuit, protecting equipment and circuits from damage.　　The working principle of low-voltage fuses is based on their special materials and structural design. It usually consists of parts such as melt, shell, and support. Melt is the core component of fuses, usually made of low melting point metal materials such as lead, tin, zinc, etc. When the current in the circuit exceeds the rated current of the fuse, the melt heats up and gradually melts, eventually disconnecting the circuit.　　Low voltage fuses have multiple advantages. Firstly, it has a fast response speed and can instantly cut off excessive current to prevent the fau

August 10,2023

Working principle of self recovery fuse.battery charger fuse

　　　　In this link, the components that can block the oscillating current are usually fuses, but the general fuses are only disposable. If self recovery fuses are used, then the instruments in this type of circuit can be used for Test effort. And this type of function can be guaranteed not only by self recovery fuses, but also by some temperature sensors. However, these electronic components are far from fast in terms of reflection time compared to self recovery fuses. Therefore, for circuits with high-precision instruments, if some temperature sensors are applied, the oscillating current can burn out the instrument before the resistor blocks the power circuit.　　The function of a self restoring fuse is to provide overcurrent protection in the power circuit. A circuit with a high-precision instrument must have a fuse to maintain the safety of the high-precision instrument. However, if human factors are often used to remove and replace fuses during frequent use, it is not specific, which i

July 19,2023

Thermal cutoff NEC.best hair thermal protector

　　　　Although Thermal cutoff has high reliability in design, there are limits to the abnormal conditions that a single Thermal cutoff can cope with. In addition, due to man-made or unpredictable force majeure, the Thermal cutoff is damaged and cannot function normally, so the circuit cannot be cut off in time when the machine is abnormal. Therefore, when the machine is overheated, when the wrong action has a direct impact on the human body, when there is no circuit cut-off equipment except the fuse, and when high safety is required, more than two Thermal cutoff with different fusing temperatures should be used.　　The thin Thermal cutoff is specially developed for the over temperature protection of lithium ion batteries. Its working principle is the same as that of the second Thermal cutoff mentioned above. The circuit is connected with low melting point alloy, which is wrapped with flux resin, connected with metal guide plate and sealed with plastic material. When there is a short circui

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Fuseless car charger, carefully burn your phone

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2023-04