SSZ electrical components Germany SSZ model SSZ price

SSZ electrical component is a current-limiting element. After connecting a resistor in the circuit, the resistance value is fixed, generally with two pins, and it can limit the current magnitude through the branch to which it is connected. A resistor whose resistance value cannot be changed is called a fixed resistor. A resistor whose resistance value can be changed is called a potentiometer or variable resistor. An ideal resistor is linear, meaning the instantaneous current through the resistor is proportional to the applied instantaneous voltage. Variable resistors used for voltage division. One or two movable metal contacts are pressed tightly against the exposed resistive body. The contact position determines the resistance between either end of the resistive body and the contact. The terminal voltage and current have a definite functional relationship. It is a two-terminal device that embodies the ability to convert electrical energy into other forms, represented by the letter R, with the unit Ohm Ω. Actual devices such as light bulbs, heating wires, and resistors can all be represented as resistor elements. The resistance value of a resistive element is generally related to temperature, material, length, and cross-sectional area. The physical quantity measuring the extent to which resistance is affected by temperature is the temperature coefficient, defined as the percentage change in resistance value when the temperature increases by 1 ℃. The main physical characteristic of a resistor is converting electrical energy into thermal energy; it can also be said to be a dissipative element, generating internal energy when current passes through it. Resistors usually serve the functions of voltage division and current shunting in circuits. For signals, both AC and DC signals can pass through resistors.

SSZ 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 the rated power of the potentiometer. Note that the rated power is not equal to the power between the center tap and the 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. Tolerance class: The error range between the measured resistance and the nominal resistance allows for errors of 20%, 10%, 5%, 2%, and 1% depending on the precision class. The precision of precision potentiometers can reach 0.1%. 7. 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 controllers in radios, tape recorders, phonographs, and televisions. If a replacement of the same type is not found during maintenance, a linear type can be used as a substitute, but a logarithmic type should not be used. Logarithmic potentiometers are only suitable for tone control, etc.

SSZ electrical component parameters

The main parameters of a transistor include current amplification factor, dissipation power, frequency characteristics, maximum collector current, maximum reverse voltage, and reverse current. Amplification factor: The DC current amplification factor, also known as the static current amplification factor or DC amplification ratio, refers to the ratio of the transistor collector current to the base current when there is no changing signal input in the static state. AC amplification factor: The AC amplification factor, also known as the AC current amplification factor or dynamic current amplification factor, refers to the ratio of the change in transistor collector current to the change in base current in the AC state. Dissipation power: Dissipation power, also known as the maximum allowable collector dissipation power PCM, refers to the maximum collector dissipation power when the transistor parameter changes do not exceed the specified allowable values. Dissipation power is closely related to the transistor's maximum allowable junction temperature and maximum collector current. When using a transistor, its actual power consumption must not exceed the PCM value; otherwise, the transistor will be damaged due to overload. When the operating frequency of a transistor exceeds the cutoff frequency, its current amplification factor will decrease as the frequency increases. The maximum oscillation frequency refers to the frequency at which the transistor's power gain drops to 11. Typically, the maximum oscillation frequency of high-frequency transistors is lower than the common-base cutoff frequency, while the characteristic frequency is higher than the common-base cutoff frequency and lower than the common-collector cutoff frequency. Maximum current: The maximum collector current refers to the maximum current allowed to pass through the transistor collector. Maximum reverse voltage: The maximum reverse voltage refers to the highest working voltage allowed to be applied to the transistor during operation. It includes the collector-emitter reverse breakdown voltage, collector-base reverse breakdown voltage, and emitter-base reverse breakdown voltage. Collector reverse breakdown voltage refers to the maximum allowable reverse voltage between the collector and emitter when the transistor base is open. Base reverse breakdown voltage refers to the maximum allowable reverse voltage between the collector and base when the transistor emitter is open. Emitter reverse breakdown voltage refers to the maximum allowable reverse voltage between the emitter and base when the transistor collector is open. The reverse current between bases, also known as the collector junction reverse leakage current, refers to the reverse current between the collector and base when the transistor emitter is open. The reverse breakdown current between emitters refers to the reverse leakage current between the collector and emitter when the transistor base is open, also known as the penetration current. The smaller this current value, the better the performance of the transistor.

SSZ electrical component classification

There are various classification methods for thyristors: (1) Classification by turn-off, conduction, and control methods: Thyristors can be divided into conventional thyristors, bidirectional thyristors, reverse-conducting thyristors, gate turn-off thyristors, BTG thyristors, temperature-controlled thyristors, and light-controlled thyristors based on their turn-off, conduction, and control methods. (2) Classification by pins and polarity: Thyristors can be divided into two-pin thyristors, three-pin thyristors, and four-pin thyristors based on their pins and polarity. (3) Classification by package form: Thyristors can be divided into three types: metal-packaged thyristors, plastic-packaged thyristors, and ceramic-packaged thyristors based on their package form. Among them, metal-packaged thyristors are further divided into bolt-type, flat-type, round-case type, etc.; plastic-packaged thyristors are divided into types with heat sinks and without heat sinks. (4) Classification by current capacity: Thyristors can be divided into high-power thyristors, medium-power thyristors, and low-power thyristors based on current capacity. Typically, high-power thyristors mostly use metal case packaging, while medium and low-power thyristors mostly use plastic or ceramic packaging. (5) Classification by turn-off speed: Thyristors can be divided into conventional thyristors and high-frequency (fast) thyristors based on their turn-off speed. (6) Zero-crossing trigger - generally for power regulation, i.e., triggering when the phase of the sinusoidal AC voltage crosses the zero point; triggering must occur at the zero crossing to conduct the thyristor. (7) Non-zero-crossing trigger - the thyristor can be triggered to conduct regardless of the phase of the AC voltage; common method is phase-shift triggering, i.e., changing the output percentage by altering the conduction angle (phase angle) of the sinusoidal AC.

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