elmat electrical components Germany elmat model elmat price

elmat electrical components are current fuses that provide overload protection. When a circuit fault or abnormality occurs, the current continues to rise. This rising current may damage certain important devices in the circuit, burn out the circuit, or even cause a fire. If a fuse is correctly installed in the circuit, it will melt and cut off the current when the current abnormally rises to a certain level and temperature, thereby protecting the safe operation of the circuit. With the fuse correctly installed in the circuit, the fuse will melt and cut off the current when the current abnormally rises to a certain level and temperature, protecting the safe operation of the circuit. The fuse invented by Edison was used to protect the expensive incandescent lamps of the time. With the development of the times, fuses protect power equipment from damage due to overcurrent and overheating, avoiding serious damage to electronic equipment caused by internal faults.

elmat electrical component classification

Inductor coils commonly used in circuits are roughly classified as follows: Classification by inductance form: fixed inductors, variable inductors. Classification by magnetic core properties: air-core coils, ferrite coils, iron-core coils, copper-core coils. Classification by operating nature: antenna coils, oscillator coils, choke coils, wave trap coils, deflection coils. Classification by winding structure: single-layer coils, multi-layer coils, honeycomb coils, close-wound coils, spaced-wound coils, self-supporting coils, honeycomb coils, random-wound coils.

elmat electrical component principle

A resistor consists of three parts: the resistive element, the backbone, and the leads (for solid-core resistors, the resistive element and the backbone are combined into one), and only the resistive element determines the resistance value. The volt-ampere characteristic is represented by a graphical curve showing the relationship between voltage and current at the resistor terminals. When voltage and current are proportional (the characteristic is a straight line), it is called a linear resistor; otherwise, it is called a non-linear resistor. The maximum power dissipation allowed for a resistor to operate continuously at the rated temperature (maximum ambient temperature) tR. For each type of resistor, a maximum working voltage is also specified. That is, when the resistance value is high, the maximum working voltage must not be exceeded even if the rated power has not been reached. The rated power of a resistor refers to the maximum power allowed to be consumed during long-term continuous operation in DC or AC circuits. Load characteristics: When the ambient working temperature is lower than tR, the resistor must not exceed its rated power. When it exceeds tR, the load power must be reduced. Each type of resistor has specified load characteristics. In addition, the allowable load is correspondingly reduced under low atmospheric pressure. Under pulse load, the average pulse power is far lower than the rated power, and there are generally separate regulations.

elmat electrical component requirements

1, copper and aluminum rods commonly used for power cables are passed through one or several drawing dies using a wire drawing machine at room temperature, reducing their cross-section, increasing their length, and improving their strength. Wire drawing is the first process for each wire and cable company, and the primary process parameter for drawing is die matching craftsmanship. 2, copper and aluminum single wires are heated to a certain temperature to improve the toughness and reduce the strength of the single wires through recrystallization, meeting the requirements of wire and cable conductive cores. The key to the annealing process is to prevent oxidation of the copper wire. 3, to improve the flexibility of power cables for easier laying and installation, the conductive core is made by stranding multiple single wires. Based on the stranding method of the conductive core, it can be divided into regular stranding and irregular stranding. Irregular stranding is further divided into bunch stranding, concentric composite stranding, and special stranding. To reduce the occupied area of the conductor and the geometric size of the power cable, a compacting method is adopted during conductor stranding, changing the ordinary circular shape into semi-circular, sectoral, tile-shaped, and compacted circular shapes. Such conductors are mainly used in power cables. 4, plastic power cables mainly adopt extruded solid insulation layers. The deviation value of the insulation thickness of plastic insulation is an important indicator of the extrusion process level. Most product structural dimensions and their deviation values are clearly specified in standards. The surface of the plastic insulation layer must be smooth, without poor quality issues such as roughness, scorching, or impurities. The cross-section of the insulation layer must be dense and firm, with no visible pinholes, and bubbles must be prevented. 5, multi-core power cables generally need to be cabled into a circular shape to ensure form stability and reduce the cable profile. The cabling mechanism is similar to conductor stranding. Due to the large stranding pitch, most adopt a non-back-twist method. Technical requirements for cabling: first, prevent irregularly shaped insulated cores from turning over, causing cable twisting; second, prevent damage to the insulation layer. Most cables complete two other processes during cabling: one is filling, to ensure the roundness and stability of the cable after cabling; the other is binding, to ensure the cable core does not loosen. 6, to protect the insulated cores from being damaged by the armor, appropriate protection is required for the insulation layer. The inner sheath is divided into: extruded inner sheath (isolation sleeve) and wrapped inner sheath (cushioning layer). The wrapped cushioning layer replaces the binding tape and is performed synchronously with the cabling process. 7, for power cables laid underground, which may withstand certain positive pressure during operation, an inner steel tape armored structure can be selected. For power cables laid in locations with both positive pressure and tensile force (such as in water, vertical shafts, or soil with large drops), a structure with inner steel wire armor should be selected. 11, the outer sheath is the structural part that protects the insulation layer of the power cable from environmental corrosion. The main functions of the outer sheath are to improve the mechanical strength of the power cable, provide chemical corrosion resistance, moisture resistance, water immersion resistance, and flame retardancy. Depending on the different requirements for the power cable, a plastic sheath is directly extruded using an extruder.

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