Felten Guilleaume electrical components Germany Felten Guilleaume models Felten Guilleaume prices

Felten Guilleaume 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 they are called digital thermometers or digital temperature gauges.

Felten Guilleaume electrical components functions

In DC circuits, capacitors act as open circuits. A capacitor is a component capable of storing electric charge and is one of the most commonly used electronic components. Starting with the structure of a capacitor: the simplest capacitor consists of two end plates and an insulating dielectric medium in between (including air). When energized, the plates become charged, creating a voltage (potential difference), but due to the insulating material in between, the entire capacitor does not conduct electricity. However, this situation holds under the premise that the capacitor's critical voltage (breakdown voltage) is not exceeded. We know that any material is relatively insulating; when the voltage across a material increases to a certain level, the material can conduct electricity. We call this voltage the breakdown voltage. Capacitors are no exception; once a capacitor breaks down, it is no longer an insulator. However, at the secondary education level, such voltages are not encountered in circuits, so they operate below the breakdown voltage and can be regarded as insulators. But in AC circuits, because the direction of current changes over time according to a specific functional relationship. The charging and discharging process of a capacitor takes time, during which a changing electric field forms between the plates, and this electric field is also a function that varies with time. In fact, current passes through the capacitor in the form of an electric field.

Felten Guilleaume electrical components classification

Classification by application: toggle switches, band switches, record/playback switches, power switches, preselection switches, limit switches, control switches, changeover switches, isolating switches, travel switches, wall switches, smart fire protection switches, etc. Classification by structure: micro switches, rocker switches, toggle switches, slide switches, push-button switches, key switches, as well as fashionable membrane switches and dot switches. Classification by contact type: switches can be divided into a type contacts, b type contacts, and c type contacts based on contact type. Contact type refers to the relationship between the operating condition (closing of contacts after pressing the switch) and the contact state. Suitable contact types of switches need to be selected according to the application. Classification by number of switches: single-control switches, dual-control switches, multi-control switches, dimmer switches, speed control switches, splash-proof boxes, doorbell switches, sensor switches, touch switches, remote control switches, smart switches, card-insertion power switches, dedicated switches for bathroom heaters.

Felten Guilleaume electrical components types

For different application scenarios, the purpose of using varistors varies, and the voltage/current applied to the varistor differs accordingly. Therefore, the requirements for varistors also vary. It is crucial to distinguish these differences for proper usage. Based on the intended use, varistors can be classified into two main categories: ① protection varistors and ② circuit function varistors. Protection varistors: (1) Distinguish whether it is a power supply protection varistor or a signal/data line protection varistor, as they must meet different technical standards. (2) Depending on the continuous operating voltage applied to the varistor, varistors used across power lines can be divided into AC type or DC type, with different aging characteristics under these two types of voltage stress. (3) According to the abnormal overvoltage characteristics that the varistor can withstand, varistors can be categorized into three types: surge suppression type, high-power type, and high-energy type. 1. Surge suppression varistors are designed to suppress transient overvoltages such as lightning-induced overvoltage and switching overvoltage. These transient overvoltages occur randomly and non-periodically, with potentially very high peak current and voltage values. Most varistors fall into this category. 2. High-power varistors are used to absorb periodic pulse groups, such as those connected in parallel with switch-mode power converters. Here, the impact voltage occurs periodically, with a known cycle, and the energy value can generally be calculated. Although the peak voltage is not particularly high, the average power is considerable due to the high frequency of occurrence. 6. High-energy varistors are used to absorb magnetic energy from large inductive coils, such as generator excitation coils and lifting electromagnet coils. For such applications, the primary technical specification is the energy absorption capability. In most cases, the protective function of varistors can be repeatedly utilized; however, sometimes they are designed as "one-time" protective devices similar to current fuses. An example includes varistors with short-circuit contacts connected in parallel to certain current transformer loads.

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