api computer electrical components German api computer models api computer prices

api computer electrical components consist of two conductors placed close to each other with a non-conductive insulating dielectric layer in between, forming a capacitor. When voltage is applied across the two plates of a capacitor, it stores electric charge. The capacitance value is numerically equal to the ratio of the charge on one conductive plate to the voltage between the two plates. The basic unit of capacitance is the Farad (F). In circuit diagrams, capacitive elements are usually denoted by the letter C; capacitors are components that store electric charge and electrical energy (electric potential energy). A system of conductors where one conductor is enclosed by another, or where all electric field lines originating from one conductor terminate on another conductor, is called a capacitor.

api computer electrical component classification

Circuit breakers are classified by number of poles: single-pole, two-pole, three-pole, and four-pole; by installation method: plug-in, fixed, and draw-out types.

api computer electrical component features

Self-resetting fuses are characterized by high breaking current capacity, capable of interrupting AC currents and even higher currents. These fuses have a very significant current-limiting effect; when instantaneous current approaches 168 kA, it is 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, with mica glass separating the stainless steel sleeve from the internal beryllium oxide ceramic insulating tube; mica glass serves as both filler and insulator. Self-resetting fuses operate based on the property 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 within the fine pores 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 point, 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 condenses back into liquid and solid states, and its resistance value returns to the original level, allowing for reuse. Regarding the wiring of self-resetting fuses, they are often used in series with circuit breakers, 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 line fault occurs, 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 effectively the current-limited value provided by the self-resetting fuse.

api computer electrical component principles

When current flows through a conductor, heat is generated due to the conductor's inherent resistance. The heat generation follows this formula: Q=I2RT; where Q represents heat generated, 0.34 is a constant, I is the current flowing through the conductor, R is the resistance of the conductor, and T is the time the current flows through the conductor; from this formula, we can clearly understand the simple working principle of a fuse. Once the material and shape of the fuse are determined, its resistance R is relatively fixed (excluding its temperature coefficient of resistance). When current flows through it, heat is generated, and the amount of heat increases with time. The magnitude of current and resistance determines the rate of heat generation, while the construction of the fuse and its installation conditions determine the rate of heat dissipation. If the rate of heat generation is less than the rate of heat dissipation, the fuse will not blow. If the rate of heat generation equals the rate of heat dissipation, it will not blow for a considerable period. If the rate of heat generation exceeds the rate of heat dissipation, heat accumulates. Due to its specific heat capacity and mass, this heat accumulation manifests as a rise in temperature. When the temperature rises above the melting point of the fuse, the fuse blows. This is the working principle of a fuse. From this principle, it is evident that when designing and manufacturing fuses, you must carefully study the physical properties of the selected materials and ensure consistent geometric dimensions, as these factors play a crucial role in the proper functioning of the fuse. Similarly, correct installation is essential during use.

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