xABBAUTOMATIONT electrical components Germany xABBAUTOMATIONT model xABBAUTOMATIONT price

xABBAUTOMATIONT electrical components refer to the aggregate of service equipment for a specific group of traffic sources, such as trunk lines, switching devices, control systems, etc. The basic research content of traffic theory is to study the relationship between traffic volume, call loss, and bundle capacity. Therefore, the line bundle is an important basic concept in traffic theory. The traffic source is the service object of the line bundle, usually referring to user equipment; in a broad sense, the upper-level equipment is the traffic source for the lower-level equipment. In telephone communication, the traffic source is also called the call source. The number of service devices contained in the line bundle is called the bundle capacity. Figure 1 is a schematic diagram of the line bundle. The capacity of this line bundle is V, and it provides services for N traffic sources. Any traffic source initiating a call can occupy an idle service device in the line bundle.

xABBAUTOMATIONT electrical component structure

The simplest switch has two pieces of metal called "contacts." When the two contacts touch, they form a current loop; when they do not touch, the current circuit is open. When selecting contact metals, their resistance to corrosion must be considered, because most metals form insulating oxides after oxidation, preventing the contacts from working properly. Factors such as electrical conductivity, hardness, mechanical strength, cost, and toxicity must also be considered when selecting contact metals. Corrosion-resistant metals are sometimes plated onto the contacts. Plating is generally applied to the contact surfaces to avoid performance degradation due to oxides. Sometimes non-metallic conductive materials, such as conductive plastics, are used for the contact surfaces. In addition to contacts, switches have movable parts that make or break the contact. Switches can be classified into lever switches, push-button switches, rocker switches, etc., based on the different movable parts, and the movable parts can also be other types of mechanical linkages.

xABBAUTOMATIONT electrical component classification

For different application scenarios, the purpose of using varistors and the voltage/current stress applied to them vary, so the requirements for varistors also differ. Paying attention to these differences is crucial for correct usage. Based on the purpose of use, varistors can be divided into two main categories: protection varistors and circuit function varistors. (1) Protection varistors: 1 Distinguish between power supply protection varistors and signal line/data line protection varistors, as they must meet different technical standard requirements. 2 Based on the different continuous operating voltages applied to the varistor, varistors across power lines can be divided into AC type and DC type. Varistors exhibit different aging characteristics under these two voltage stresses. 7 Based on the different abnormal overvoltage characteristics withstand by the varistor, varistors can be divided 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 this transient overvoltage 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 continuously occurring pulse groups, such as varistors connected in parallel to switching power supply converters. Here, the impulse voltage occurs periodically, and the period is known. The energy value can generally be calculated. Although the peak voltage is not very high, the average power is quite large due to the high frequency of occurrence. (4) High-energy type: Refers to varistors used to absorb magnetic energy in large inductive coils such as generator excitation coils and lifting electromagnet coils. For such applications, the main technical indicator is energy absorption capability. The protective function of varistors can be repeated multiple times in most application scenarios, but sometimes they are made into one-time protective devices like current fuses. For example, varistors with short-circuit contacts connected in parallel to the loads of certain current transformers.

xABBAUTOMATIONT electrical component classification

1 Fuse resistors: Also called fusible resistors, they serve the dual function of a resistor and a fuse under normal conditions. When a circuit fault causes their power to exceed the rated power, they will blow like a fuse, disconnecting the connected circuit. Fuse resistors generally have low resistance values and low power ratings. 8 Sensitive resistors: Refer to resistors whose resistance values are sensitive to certain physical quantities (such as temperature, humidity, light, voltage, mechanical force, and gas concentration). When these physical quantities change, the resistance value 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, magnetoresistors, and gas-sensitive resistors. The materials used for sensitive resistors are almost all semiconductor materials, so these resistors are also called semiconductor resistors. The resistance of a thermistor changes with temperature; if the resistance decreases as temperature rises, it is a negative temperature coefficient (NTC) thermistor. NTC thermistors are widely used and can be further divided into general-purpose NTC thermistors, voltage-stabilizing NTC thermistors, and temperature-measuring NTC thermistors. The resistance of a photoresistor changes with the intensity of incident light; when the incident light increases, the resistance of the photoresistor decreases, and when the incident light weakens, the resistance value increases.

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