QLT electrical components Germany QLT model QLT price

QLT electrical components refer to switching devices capable of closing, carrying, and breaking current under normal circuit conditions, and capable of closing, carrying, and breaking current under abnormal circuit conditions within a specified time. Circuit breakers are classified into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use. The boundary between high and low voltage is relatively vague; generally, equipment above 3kV is referred to as high-voltage electrical apparatus. Circuit breakers can be used to distribute electrical energy, start asynchronous motors infrequently, and protect power lines and motors. They can automatically cut off the circuit when serious faults such as overload, short circuit, or undervoltage occur. Their function is equivalent to a combination of fuse switches and over/under thermal relays. Moreover, component replacement is generally not required after interrupting fault currents. They have been widely applied. In the generation, transmission, and use of electricity, power distribution is an extremely important link. The distribution system includes transformers and various high- and low-voltage electrical equipment, while low-voltage circuit breakers are a type of electrical apparatus with extensive usage.

QLT electrical component principle

The thermistor will remain in a non-tripped state for extended periods; when the ambient temperature and current are in the c region, the heat dissipation power of the thermistor is close to its heat generation power, so it may or may not trip. For a given ambient temperature, the tripping time of the thermistor decreases sharply as the current increases; at relatively higher ambient temperatures, the thermistor has a shorter tripping time and lower holding current and tripping current. The PTC effect refers to a material exhibiting the PTC effect, i.e., the positive temperature coefficient effect, which means that the electrical resistance of this material increases with rising temperature. For example, most metallic materials exhibit the PTC effect. In these materials, the PTC effect manifests as a linear increase in resistance with increasing temperature, which is commonly referred to as the linear PTC effect. Nonlinear PTC effect: Materials undergoing a phase transition exhibit a phenomenon where resistance increases sharply by several to more than ten orders of magnitude within a narrow temperature range, known as the nonlinear PTC effect. Many types of conductive polymers exhibit this effect, such as polymer PTC thermistors. These conductive polymers are very useful for manufacturing overcurrent protection devices. Polymer PTC thermistors are used for overcurrent protection and are often referred to as resettable fuses (hereinafter referred to as thermistors). Due to their unique positive temperature coefficient resistance characteristics, they are highly suitable as overcurrent protection devices. The method of using a thermistor is similar to that of a conventional fuse; it is connected in series in the circuit. When the circuit operates normally, the thermistor's temperature is close to room temperature and its resistance is very low, so connecting it in series does not impede current flow. However, when an overcurrent occurs due to a fault, the increased heat generation causes the thermistor's temperature to rise. When the temperature exceeds the switching temperature, the resistance increases dramatically, rapidly reducing the current in the circuit to a safe value. After the thermistor trips, the current in the circuit is significantly reduced; t is the tripping time of the thermistor. Due to the good design flexibility of polymer PTC thermistors, their sensitivity to temperature can be adjusted by changing their switching temperature (ts), allowing them to provide both overtemperature and overcurrent protection. They are suitable for overcurrent and overtemperature protection of lithium-ion and nickel-metal hydride batteries. Influence of ambient temperature on polymer PTC thermistors: A polymer PTC thermistor is a directly heated, step-type thermistor. Its resistance change process is related to its own heat generation and dissipation conditions; therefore, its holding current, tripping current, and tripping time are influenced by ambient temperature.

QLT electrical component types

1. Classification by fixing device type: As the primary temperature measurement method, thermocouples are widely used, leading to various requirements for fixing devices and technical performance. Therefore, thermocouple fixing devices are divided into six types: no fixing device, threaded, fixed flange, movable flange, movable flange angle form, and tapered protection tube. 7. Classification by assembly and structural style: According to the performance and structural style, thermocouples can be classified into detachable thermocouples, explosion-proof thermocouples, armored thermocouples, and spring-loaded fixed thermocouples for special purposes.

QLT electrical component features

1. High sensitivity; 2. Geometric shape has multi-faceted adaptability, allowing fiber optic sensors to be made in any shape; 3. Can manufacture devices that sense various physical information (sound, magnetism, temperature, rotation, etc.); 4. Can be used in high voltage, electrical noise, high temperature, corrosion, or other harsh environments; 8. And has inherent compatibility with fiber optic telemetry technology. The advantage of fiber optic sensors compared to traditional sensors is that they use light as the carrier of sensitive information and optical fiber as the medium for transmitting sensitive information. They possess the characteristics of optical fiber and optical measurement, offering a series of unique advantages. Good electrical insulation, strong anti-electromagnetic interference capability, non-intrusive, high sensitivity, easy realization of long-distance monitoring of measured signals, corrosion resistance, explosion-proof, flexible optical path, and easy connection to computers. Sensors are developing towards sensitivity, precision, strong adaptability, compactness, and intelligence. They can act as human eyes and ears in places inaccessible to humans (such as high-temperature areas or areas harmful to humans, such as nuclear radiation zones), and can even surpass human physiological limits to receive external information imperceptible to human senses.

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