haewa electrical components Germany haewa model haewa price

haewa electrical components are current fuses that provide overload protection. When a circuit fault or abnormality occurs, the current continues to rise. This rising current may damage certain important devices in the circuit, burn out the circuit, or even cause a fire. If a fuse is correctly installed in the circuit, it will melt and cut off the current when the current abnormally rises to a certain level and temperature, thereby protecting the safe operation of the circuit. With the fuse correctly installed in the circuit, the fuse will melt and cut off the current when the current abnormally rises to a certain level and temperature, protecting the safe operation of the circuit. The fuse invented by Edison was used to protect the then-expensive incandescent lamps. With the development of the times, fuses protect power equipment from damage due to overcurrent and overheating, avoiding serious damage to electronic equipment caused by internal faults.

haewa electrical component types

1. Classification by fixing device type: As thermocouples are the main temperature measuring means and are widely used, there are various requirements for fixing devices and technical performance. Therefore, thermocouple fixing devices are divided into six types: without fixing device, threaded type, fixed flange type, movable flange type, movable flange square type, and tapered protection tube type. 6. Classification by assembly and structure method: According to the performance and structure of thermocouples, they can be divided into detachable thermocouples, explosion-proof thermocouples, armored thermocouples, and spring-loaded fixed thermocouples for special purposes.

haewa electrical component types

Commonly used thermocouples can be divided into two major categories: standard thermocouples and non-standard thermocouples. Standard thermocouples refer to those for which national standards specify the relationship between thermoelectric potential and temperature, allowable errors, and have a unified standard graduation table. They have matching display instruments available for selection. Non-standardized thermocouples are inferior to standardized thermocouples in terms of usage range or magnitude, generally lack a unified graduation table, and are mainly used for measurement in certain special occasions. Theoretically, any two different conductors (or semiconductors) can be configured as a thermocouple, but as a practical temperature measuring element, it has multiple requirements. To ensure reliability in engineering technology and sufficient measurement accuracy, not all materials can form thermocouples. The basic requirements for thermocouple electrode materials are generally: 1. Within the temperature measuring range, the thermoelectric properties are stable, do not change with time, have sufficient physical and chemical stability, and are not easily oxidized or corroded; 2. Small resistance temperature coefficient, high conductivity, and low specific heat; 3. The thermoelectric potential generated during temperature measurement is large, and the relationship between thermoelectric potential and temperature is linear or close to a linear single-valued function; 7. Good material reproducibility, high mechanical strength, simple manufacturing process, and low price.

haewa electrical component features

The characteristics of self-resetting fuses include high breaking current capacity, capable of breaking AC currents, and even larger currents. This type of fuse has a very significant current-limiting effect. When the instantaneous current reaches close to 172 kA, it can be rapidly limited. The structure of a self-resetting fuse mainly consists of current terminals (also called electrodes), mica glass (filler), insulating tube, fusible element, piston, argon gas, and housing. The housing of the self-resetting fuse is generally made of stainless steel. The stainless steel sleeve is separated from the internal beryllium oxide ceramic insulating tube by mica glass, which serves as both filler and insulator. Self-resetting fuses operate based on the characteristic of sodium metal whose resistance increases sharply at high temperatures. Under normal operating conditions, current flows from the left current terminal, through the sodium metal fusible element in the fine holes of the beryllium oxide ceramic insulating tube, to the right current terminal, forming a current path. When a short-circuit fault occurs, the short-circuit current heats the sodium metal, vaporizing it into a high-temperature, high-pressure plasma state, causing its resistance to increase sharply, thereby achieving current limiting. At this time, the high pressure generated by the vaporization of the fusible element pushes the piston to move to the right, compressing the argon gas. After the circuit breaker cuts off the short-circuit current limited by the self-resetting fuse, the temperature of the sodium vapor drops, and the pressure also decreases. The previously compressed argon gas condenses back into liquid and solid states, and its resistance value reduces to the original value, making it ready for reuse. Regarding the wiring of self-resetting fuses, they are often used in series with circuit breakers. An additional resistor is connected in parallel with the fuse itself to suppress overvoltage occurring during breaking. During normal operation, the self-resetting fuse is in a low-resistance state, and only a small current flows through the parallel resistor. When a line fault occurs, the self-resetting fuse enters a high-resistance state. The parallel resistor can absorb the overvoltage generated and maintain the operating current required for the circuit breaker trip unit, ensuring reliable breaking by the circuit breaker. Therefore, the current broken by the circuit breaker is actually the current-limited current of the self-resetting fuse.

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