Select the type of fuse based on the electrical load characteristics in the circuit (slow melting or fast melting fuse). Fuses can be divided into slow fuse and fast fuse according to their different fusing characteristics. Fast melting fuses are commonly used in resistive circuits to protect components that are particularly sensitive to current fluctuations; Slow melting fuses are commonly used to quickly disconnect circuits when there is a fault with a large surge current when the circuit status changes. Finally, according to the sensitivity/capacitance circuit (such as the fan motor circuit), it can withstand the impact of surge pulses when switching on and off the machine, and the appropriate fuse type of structure is selected for the actual assembly position where the fuse wire appears. Priority should be given to fuses that occupy little space after installation.
To fully utilize the protective effect of a fuse in a circuit, the position of the fuse in the circuit should be considered when designing the circuit. The fuse can be blown in a timely manner to protect the circuit and switch; And the fuse cannot be blown in a timely manner, unable to protect the front-end circuit and switch. If a short circuit occurs at B, the fuse can only be blown in a timely manner, which can protect the circuit; As shown in the circuit diagram, when a short circuit occurs at point A, the switch will still burn out, while the fuse will not blow, meaning that the fuse in this circuit cannot protect the circuit and electrical components. So the circuit diagram is the most reasonable one for designing the position of the fuse in the circuit. Note: For the case where relays and fuses are integrated in the same electrical box, the fuse connection is not closely related (as the possibility of a short circuit occurring within the same electrical box is not high),
A fuse is an electrical component installed in a circuit to ensure safe operation of the circuit. When the circuit malfunctions or is abnormal, it may burn the circuit or even cause a fire. Some fuses have a blown indicator device, which is used to indicate that when the fuse is activated (blown), it undergoes a certain appearance change and is easily detected by maintenance personnel. So what are the components of a fuse? 1. Electrode Usually, there are two important components that are connected between the melt and the circuit. They need to have good conductivity and should not generate significant installation contact resistance. 2. Melt It is the core of a fuse and plays a role in cutting off the current when it is blown. Fuses of the same type and specification should have the same material, geometric dimensions, and resistance values as small and consistent as possible. It is important to have consistent fusing characteristics. 3. Bracket The melt of a fuse is generall
Micro fuses are different from ordinary electronic components such as chip resistors and chip capacitors. Due to differences in manufacturers, their specifications vary greatly. In addition, actual installation can have a certain impact on the heat dissipation of printed boards and wiring. Therefore, the selection of micro fuses should ultimately be determined by the state of the product. Miniature fuses are primarily used in digital cameras, laptops, mobile phones, and other electronic products. From traditional glass tube fuses to miniature fuses, the selection focus varies slightly due to differences in product technology. The selection of miniature fuses involves the following elements: The normal operating current of the circuit should not exceed 75% of the rated current of the fuse. 2. Pulse, pulse current, surge current, starting current, and circuit transient values. Micro fuses are particularly concerned about this. Due to technological reasons brought about by small-sc
The overcurrent protection application of self recovery fuses - There are two optional types of self recovery fuse materials: radial lead packaging and surface mount. The function of self restoring fuses is suitable for various design applications. In daily life, there are many plug and play models of device products, and "plug and play" applications include motherboards and many peripheral devices that can be frequently connected or disconnected from computer ports. For example, devices connected to mice, keyboards, audio, networks, monitors, and USB ports may malfunction, the connecting cables may be damaged, or incorrect connections may occur. The application of self restoring fuses for overcurrent protection - therefore, the ability to reset after correcting incorrect connections is particularly attractive. Some of these applications use radial lead devices, while others are more suitable for surface mount devices. (Related knowledge: Application cases of self recovery fuses)
What is overcurrent protection - Short circuit protection is characterized by high setting current and instantaneous action. Electromagnetic current releases (or relays) and fuses are commonly used as short-circuit protection components. The characteristics of overload protection are small setting current and inverse time action. Thermal relays and delayed electromagnetic current relays are commonly used as overload protection components. (Related knowledge: What is the relationship between the rated current and the fusing current of a fuse?) Fuses are also commonly used as overload protection components without significant impact current. What is overcurrent protection - In TN systems, when using fuses as short-circuit protection, the rated current of the melt should be less than 1/4 of the single-phase short-circuit current; When using a circuit breaker for protection, the setting current of the instantaneous action or short delay action overcurrent release of the circuit break
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