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 components 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 then-expensive incandescent lamps. 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, 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 former, and the leads (for solid-core resistors, the resistive element and the former are combined into one), and only the resistive element determines the resistance value. The volt-ampere characteristic is a graphical curve representing 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 continuous operation of the resistor at the rated temperature (maximum ambient temperature) tR. For each 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 is not 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 temperature is lower than tR, the resistor must not exceed its rated power. When it exceeds tR, the load power must be derated. Each 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 separate specifications generally apply.

elmat electrical component requirements

1, copper and aluminum rods commonly used for power cables are passed through one or several drawing dies on a drawing machine at room temperature to reduce their cross-section, increase their length, and improve their strength. Wire drawing is the first process in wire and cable companies, 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 for conductive cores in wires and cables. The key to the annealing process is to prevent oxidation of the copper wires. 3, to improve the flexibility of power cables for easier 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 compound stranding, and special stranding. To reduce the occupied area of the conductor and the geometric size of the power cable, compacted methods are adopted during conductor stranding, changing the standard circular shape into semi-circular, sectoral, tile-shaped, and compacted circular shapes. This type of conductor is mainly used in power cables. 4, plastic power cables mainly adopt extruded solid insulation layers. The deviation of the insulation thickness of plastic insulation is an important indicator of the extrusion process level. Most product structural dimensions and their deviations 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 eliminated. 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 larger lay length, non-back-twist methods are mostly adopted. Technical requirements for cabling: first, prevent irregular insulated cores from turning over, which causes cable twisting; second, prevent scratching of the insulation layer. Most cables complete two other processes during cabling: filling, to ensure the roundness and stability of the cable after cabling; and 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. Inner sheaths are divided into: extruded inner sheath (separating sleeve) and wrapped inner sheath (bedding). Wrapped bedding replaces binding tape and is performed synchronously with the cabling process. 7, for power cables laid underground that can withstand a 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 forces (such as in water, vertical shafts, or soil with large elevation differences), 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 ingress prevention, and flame retardancy. Plastic sheaths are directly extruded using an extruder according to different requirements for the power cable.

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