spelsberg electrical components Germany spelsberg models spelsberg prices

spelsberg electrical components are devices for transmitting electrical energy or signals, typically composed of several wires or groups of wires. They consist of one or more mutually insulated conductors with an outer insulating protective layer, forming wires that transmit power or information from one location to another. Typically, they are cable-like ropes formed by twisting several wires or groups of wires (each group having at least two), with mutual insulation between each group of wires, often twisted around a central core, and the entire assembly is covered with a highly insulating sheath. Cables feature internal conductivity and external insulation.

spelsberg electrical component characteristics

Dynamic characteristics refer to the output behavior of a sensor when the input changes. In practical applications, the dynamic characteristics of a sensor are often expressed by its response to certain standard input signals. This is because the sensor's response to standard input signals can be easily determined experimentally, and there is a definite relationship between its response to standard input signals and its response to arbitrary input signals; knowing the former often allows inference of the latter. The most commonly used standard input signals are step signals and sinusoidal signals, so the dynamic characteristics of sensors are also commonly expressed by step response and frequency response.

spelsberg electrical component classification

1, fuse resistors: Also known as fusible resistors, they serve the dual function of a resistor and a fuse under normal conditions. When a circuit fault causes their power dissipation to exceed the rated power, they blow like a fuse, disconnecting the circuit. Fuse resistors generally have low resistance values and low power ratings. 3, sensitive resistors: These exhibit sensitivity in their resistance value to certain physical quantities (such as temperature, humidity, light intensity, voltage, mechanical force, and gas concentration). When these physical quantities change, the resistance of the sensitive resistor changes accordingly, presenting different resistance values. Based on sensitivity to different physical quantities, sensitive resistors can be classified into thermistors, humidity-sensitive resistors, photoresistors, varistors, force-sensitive resistors, magnetosensitive resistors, and gas-sensitive resistors. The materials used for sensitive resistors are almost exclusively semiconductors, so these resistors are also called semiconductor resistors. The resistance of a thermistor changes with temperature; those whose resistance decreases as temperature rises are negative temperature coefficient (NTC) thermistors. NTC thermistors are widely used and can be further divided into general-purpose NTC thermistors, voltage-stabilizing NTC thermistors, and temperature-measuring NTC thermistors. A photoresistor's resistance changes with the intensity of incident light; when light intensity increases, the resistance of the photoresistor decreases, and when light intensity weakens, the resistance increases.

spelsberg electrical component classification

In different application scenarios, the purpose of using varistors varies, and the voltage/current stress applied to the varistor differs, resulting in different requirements for the varistor. Distinguishing these differences is crucial for correct usage. Based on the application purpose, varistors can be divided into two main categories: protection varistors and circuit-function varistors. (1) Protection varistors: 1 Distinguish whether they are for power supply protection or for signal line and data line protection, as they must meet different technical standard requirements. 2 Based on the continuous operating voltage applied to the varistor, varistors across power lines can be distinguished into AC types or DC types; varistors exhibit different aging characteristics under these two voltage stresses. 6 Based on the abnormal overvoltage characteristics withstandable by the varistor, varistors can be classified into three types: surge suppression type, high-power type, and high-energy type. (2) Surge suppression type: Refers to varistors used to suppress transient overvoltages such as lightning overvoltage and switching overvoltage. The occurrence of such transient overvoltages is random and non-periodic, and the peak current and voltage may be very high. The vast majority of varistors belong to this category. (3) High-power type: Refers to varistors used to absorb continuous pulse trains that occur periodically, such as varistors connected in parallel to switching power supply converters. Here, impulse voltages occur periodically with a known period, and the energy value can generally be calculated. Although the voltage peak is not very high, the average power is considerable due to the high frequency of occurrence. (4) High-energy type: Refers to varistors used to absorb magnetic energy from large inductive coils such as generator excitation coils and lifting electromagnet coils. For such applications, the main technical indicator is energy absorption capacity. The protective function of varistors can be repeated many times in most application scenarios, but sometimes they are made into one-time protective devices similar to current fuses. For example, varistors with short-circuit contacts connected in parallel to the loads of certain current transformers.

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