legrand electrical components Germany legrand model legrand price

legrand electrical components are tools that can accurately determine and measure temperature, divided into pointer thermometers and digital thermometers. Depending on the temperature-sensing substance used and the temperature measurement range, there are kerosene thermometers, alcohol thermometers, mercury thermometers, gas thermometers, resistance thermometers, thermocouple thermometers, radiation thermometers and optical pyrometers, bimetallic thermometers, etc. Digital thermometers can accurately determine and measure temperature, displaying it digitally rather than with a pointer or mercury. Hence the name digital thermometer or digital temperature gauge.

legrand electrical component parameters

The main parameters of a potentiometer include nominal resistance, rated power, resolution, sliding noise, resistance variation characteristic, wear resistance, zero-position resistance, and temperature coefficient. 1. Rated power: The maximum power allowed to be dissipated across the two fixed terminals of a potentiometer is its rated power. Note that the rated power is not equal to the power between the center tap and a fixed terminal. The rated power of a potentiometer refers to the maximum power allowed to be consumed under long-term continuous load at the specified rated temperature in DC or AC circuits when the atmospheric pressure is 87~107kPa. 2. Nominal resistance: The nominal resistance value marked on the product, with series similar to those of resistors. 3. Allowable tolerance class: The error range between the measured resistance and the nominal resistance allows for 20%, 10%, 5%, 2%, 1% error depending on the precision class. The precision of precision potentiometers can reach 0.1%. 9. Resistance variation law: Refers to the relationship between resistance change and the rotation angle (or sliding travel) of the wiper contact. This relationship can take any functional form; common types include linear, logarithmic, and reverse logarithmic (exponential). In use, linear potentiometers are suitable as voltage dividers; reverse logarithmic (exponential) potentiometers are suitable as volume controls in radios, recorders, phonographs, and televisions. If a replacement of the same type is unavailable during maintenance, a linear type may be used as a substitute, but a logarithmic type should not be used. Logarithmic potentiometers are only suitable for tone control, etc.

legrand electrical component structure

The basic structure of a voltage transformer is very similar to that of a transformer; it also has two windings, one called the primary winding and the other called the secondary winding. Both windings are mounted on or wound around an iron core. There is insulation between the two windings and between the windings and the iron core, providing electrical isolation between the two windings and between the windings and the iron core. During operation of the voltage transformer, the primary winding N1 is connected in parallel to the line, and the secondary winding N9 is connected in parallel to instruments or relays. Therefore, when measuring voltage on high-voltage lines, although the primary voltage is very high, the secondary side is low voltage, ensuring the safety of operators and instruments.

legrand electrical component structure

A solid-state relay consists of three parts: input circuit, isolation, and output circuit. According to different categories of input voltage, input circuits can be divided into DC input circuits, AC input circuits, and AC/DC input circuits. Some input control circuits also feature compatibility with TTL/CMOS, positive/negative logic control, and inversion functions, allowing convenient connection to TTL, MOS logic circuits. For control signals with fixed control voltage, resistive input circuits are adopted. The isolation and coupling methods between the input and output circuits of solid-state relays include optocoupling and transformer coupling: Optocoupling typically uses photodiode-phototransistor, photodiode-triac optocoupler, or photovoltaic cells to achieve isolated control between the control side and the load side; High-frequency transformer coupling utilizes self-excited high-frequency signals generated by the input control signal, coupled to the secondary side, then demodulated, rectified, and processed by logic circuits to form drive signals. The power switch of the solid-state relay is directly connected to the power supply and load terminals to realize switching of the load power. Mainly used components include high-power bipolar transistors, SCRs, triacs, power MOSFETs, and IGBTs. The output circuit of a solid-state relay can also be divided into DC output circuits, AC output circuits, and AC/DC output circuits. According to load type, they can be divided into DC solid-state relays and AC solid-state relays. For DC output, bipolar devices or power MOSFETs can be used; for AC output, two SCRs or one triac are typically used. AC solid-state relays can be further divided into single-phase AC solid-state relays and three-phase AC solid-state relays. AC solid-state relays can be classified into random-turn-on AC solid-state relays and zero-crossing AC solid-state relays based on the timing of turn-on and turn-off.

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