VEZALUX electrical components Germany VEZALUX model VEZALUX price

VEZALUX 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.

VEZALUX electrical components functions

A multimeter can not only be used to measure the resistance of an object, AC and DC voltage, but also DC voltage. Some multimeters can even measure the main parameters of transistors and the capacitance of capacitors. Proficient mastery of multimeter usage is one of the most basic skills in electronic technology. Common multimeters include analog multimeters and digital multimeters. An analog multimeter is a multifunctional measuring instrument with a meter head as the core component; the measured value is read from the pointer indication on the meter head. The measured value of a digital multimeter is directly displayed in numerical form on an LCD screen, making it easy to read; some also feature voice prompts. A multimeter is an instrument that integrates a voltmeter, ammeter, and ohmmeter using a single meter head. The DC current range of a multimeter is a multi-range DC ammeter. Connecting a shunt resistor in parallel with the meter head expands its current range. The DC voltage range of a multimeter is a multi-range DC voltmeter. Connecting a voltage-divider resistor in series with the meter head expands its voltage range. Different voltage-divider resistors result in different ranges. The meter head of a multimeter is a magnetoelectric measuring mechanism, which can only pass DC. By using diodes to convert AC to DC, it achieves AC measurement.

VEZALUX electrical components composition

A diode is formed by a PN junction plus corresponding electrode leads and package casing. Using different doping processes and diffusion, P-type semiconductor and N-type semiconductor are fabricated on the same semiconductor substrate (usually silicon or germanium), forming a space charge region at their interface called the PN junction. The electrode drawn from the P region is called the anode, and the electrode drawn from the N region is called the cathode. Due to the unidirectional conductivity of the PN junction, when the diode is conducting, the current flows from the anode through the interior of the tube to the cathode. A diode has two electrodes: the electrode drawn from the P region is the positive pole, also called the anode; the electrode drawn from the N region is the negative pole, also called the cathode.

VEZALUX electrical components characteristics

The characteristics of a self-resetting fuse include high breaking current capacity, capable of interrupting AC and even higher currents. This type of fuse has a very significant current-limiting effect; when the instantaneous current reaches close to 171 kiloamperes, it can rapidly limit the current. 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, with mica glass separating the stainless steel sleeve from the internal beryllium oxide ceramic insulating tube; mica glass serves as both filler and insulator. The self-resetting fuse operates 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 vaporized fusible element pushes the piston to the right, compressing the argon gas. After the circuit breaker interrupts the short-circuit current limited by the self-resetting fuse, the temperature of the sodium vapor drops, and the pressure decreases accordingly. The previously compressed argon gas causes the sodium to condense back into liquid and solid states, and its resistance value drops back to the original value, ready for reuse. Regarding the wiring of the self-resetting fuse, it is often used in series with a circuit breaker, with an additional resistor connected in parallel to suppress overvoltage during interruption. 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 fault occurs in the line, the self-resetting fuse enters a high-resistance state; the parallel resistor absorbs the resulting overvoltage and maintains the operating current required for the circuit breaker trip unit, ensuring reliable interruption by the circuit breaker. Therefore, the current interrupted by the circuit breaker is actually the current-limited current of the self-resetting fuse.

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