FHF electrical components Germany FHF model FHF price

FHF electrical components are a common type of low-current master control device. They utilize the collision of moving parts of production machinery to actuate their contacts, thereby connecting or disconnecting control circuits to achieve specific control objectives. Typically, such switches are used to limit the position or travel of mechanical motion, causing the moving machinery to automatically stop, reverse, change speed, or perform automatic reciprocating motion according to a specified position or travel. In electrical control systems, the role of position switches is to implement sequence control, positioning control, and detection of position status. They are used to control the travel of mechanical equipment and provide limit protection. Construction: consists of an operating head, contact system, and housing. In actual production, limit switches are installed at predetermined positions. When a module mounted on the moving part of the production machinery strikes the limit switch, the contacts of the limit switch actuate, achieving circuit switching. Therefore, a limit switch is an electrical device that switches circuits based on the travel position of moving parts; its operating principle is similar to that of a pushbutton. Limit switches are widely used in various machine tools and lifting machinery to control their travel and provide terminal limit protection. In elevator control circuits, limit switches are also used to control the speed of opening and closing car doors, provide automatic door opening/closing limits, and provide upper and lower limit protection for the car.

FHF electrical component types

1. A dial thermometer is made from a coiled bimetallic strip. One end of the bimetallic strip is fixed, and the other end is connected to a pointer. Because the two metal strips have different expansion rates, they cause the bimetallic strip to coil to different degrees at different temperatures, causing the pointer to indicate different positions on the dial. The temperature can be determined from the reading on the dial. 2. The resistance change of semiconductor thermometers differs from that of metals; as temperature increases, their resistance decreases, and the magnitude of change is relatively large. Therefore, even small temperature changes can cause significant changes in resistance, resulting in thermometers with high precision, often referred to as thermal sensors. 3. A thermocouple thermometer consists of two different metals connected to a sensitive voltmeter. At different temperatures, the metal junction generates different potential differences across the ends of the metals. The potential difference is very small, so a sensitive voltmeter is required to measure it. The temperature can be determined from the voltmeter reading. 4. Optical pyrometer: When an object's temperature is high enough to emit a large amount of visible light, its temperature can be determined by measuring the amount of thermal radiation it emits; this type of thermometer is called an optical pyrometer. This thermometer mainly consists of a telescope equipped with a red filter and a circuit containing a small lamp, a galvanometer, and a variable resistor. Before use, the relationship between the temperature corresponding to different filament brightness levels and the galvanometer reading is established. During use, align the telescope with the object to be measured and adjust the resistor until the brightness of the lamp matches that of the object. The temperature of the object can then be read from the galvanometer. 5. Liquid crystal thermometers made with different formulations have different phase transition temperatures. When they undergo a phase transition, their optical properties change, causing the liquid crystal to appear to change color. If liquid crystals with different phase transition temperatures are coated on a sheet of paper, the temperature can be determined by the color change of the liquid crystal. The advantage of this thermometer is easy reading, while the disadvantage is insufficient accuracy. It is commonly used in ornamental fish tanks to indicate water temperature. 10. A digital thermometer uses a temperature sensor to convert (temperature) into a digital signal, which is then displayed in numerical form on a display (such as LCD, seven-segment display, LED matrix, etc.). It can quickly and accurately measure the maximum human body temperature. Compared with traditional mercury thermometers, it offers advantages such as convenient digital reading, short measurement time, high measurement accuracy, memory function, and audible alerts. In particular, digital thermometers do not contain mercury, making them harmless to the human body and the surrounding environment, and thus particularly suitable for use in hospitals and homes.

FHF electrical component classification

1, fusible resistors: Also known as fuse resistors, they serve the dual function of a resistor and a fuse under normal conditions. When a circuit fault causes their power consumption to exceed the rated power, they will blow like a fuse, disconnecting the connected circuit. Fusible resistors generally have low resistance values and low power ratings. 11, sensitive resistors: These refer to resistors whose resistance values are sensitive to certain physical quantities (such as temperature, humidity, light intensity, 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, humidistors, photoresistors, varistors, force-sensitive resistors, magnetoresistors, and gas-sensitive resistors. The materials used for sensitive resistors are almost all semiconductor materials, and such resistors are also called semiconductor resistors. The resistance value of a thermistor changes with temperature; a thermistor whose resistance decreases as temperature rises is called 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 value of a photoresistor changes with the intensity of incident light; when incident light increases, the resistance of the photoresistor decreases, and when incident light weakens, the resistance value increases.

FHF electrical component reliability

1, Influence of environment on relay reliability: Relays have the highest mean time between failures when operating under GB and SF conditions. 2, Influence of quality grade on relay reliability: The quality grade of a relay has a very significant impact on its reliability performance. 3, Influence of contact form on relay reliability: The contact form of a relay also affects its reliability. The reliability of single-throw relays is higher than that of double-throw relays with the same number of poles, and reliability gradually decreases as the number of poles increases. The mean time between failures for a single-pole single-throw relay is higher than that for a four-pole double-throw relay. 4, Influence of structural type on relay reliability: There are many types of relay structures, and different types all affect their reliability. 5, Influence of temperature on relay reliability: Within a certain operating temperature range for relays, as the temperature rises, the mean time between failures gradually decreases. 6, Influence of operating rate on relay reliability: As the operating rate of the relay increases, the mean time between failures basically shows an exponential downward trend. Therefore, if the designed circuit requires a very high operating rate for the relay, careful inspection of the relay is required during circuit maintenance to replace it in a timely manner. 15, Influence of current ratio on relay reliability: The so-called current ratio is the ratio of the relay's working load current to its rated load current. The current ratio has a significant impact on relay reliability. Therefore, in circuit design, loads with higher rated currents should be selected to reduce the current ratio, ensuring that the reliability of the relay and the entire circuit is not reduced due to fluctuations in working current.

Weidou Intelligent Technology specializes in selling German FHF connectors, FHF switches, FHF relays, FHF controllers, FHF plugs, FHF sensors, FHF resistors, FHF capacitors, FHF buses, FHF modules, FHF cables, FHF power supplies, FHF interfaces, FHF gateways, FHF circuit breakers, FHF original imports from Germany. We welcome inquiries and orders from users.