54/6/1 in stock German 54/6/1 electrical components 54/6/1 inventory

54/6/1 Electrical components refer to devices that disconnect the circuit by melting the fuse element with the heat generated when the current exceeds a specified value. A fuse is a current protection device made based on the principle that after the current exceeds the specified value for a period of time, the heat generated melts the fuse element, thereby disconnecting the circuit. Fuses are widely used in high and low voltage distribution systems, control systems, and electrical equipment as short-circuit and overcurrent protectors, making them one of the most commonly used protective devices. Using a metal conductor as the fuse element connected in series in the circuit, when overload or short-circuit current passes through the fuse element, it melts due to self-heating, thereby disconnecting the circuit. Fuses have a simple structure and are easy to use, widely used in power systems, various electrical equipment, and household appliances as protective devices.

54/6/1 Electrical component principle

When the voltage applied to the varistor is below its threshold, the current flowing through it is extremely small, equivalent to a resistor with infinite resistance. That is, when the voltage applied to it is below its threshold, it acts like an open switch. When the voltage applied to the varistor exceeds its threshold, the current flowing through it surges, equivalent to a resistor with infinitesimal resistance. That is, when the voltage applied to it is above its threshold, it acts like a closed switch. Protection principle of surge absorbers: In the standby state, the varistor has very high impedance (several megaohms) relative to the protected electronic components and does not affect the characteristics of the original design circuit. However, when instantaneous surge voltage occurs (exceeding the breakdown voltage of the surge absorber), the impedance of the surge absorber drops low (only a few ohms), causing a short circuit in the line, thereby protecting electronic products or more expensive components.

54/6/1 Electrical component principle

Bipolar junction transistors are divided into two types by material: germanium transistors and silicon transistors. Each type has two structural forms: NPN and PNP. The most commonly used are silicon NPN and germanium PNP transistors. (Here, N means negative; N-type semiconductor is formed by adding phosphorus to high-purity silicon to replace some silicon atoms, generating free electrons for conduction under voltage stimulation. P means positive; boron is added to replace silicon, creating numerous holes to facilitate conduction). Apart from different power supply polarities, their working principles are identical. Below, only the current amplification principle of NPN silicon transistors is introduced. An NPN transistor consists of 6 pieces of N-type semiconductor sandwiching one piece of P-type semiconductor. The PN junction formed between the emitter region and the base region is called the emitter junction, and the PN junction formed between the collector region and the base region is called the collector junction. The three leads are called the emitter e, base b, and collector c. When the potential at point b is a few tenths of a volt higher than at point e, the emitter junction is forward-biased. When the potential at point C is a few volts higher than at point b, the collector junction is reverse-biased, and the collector power supply Ec must be higher than the base power supply Eb. During transistor manufacturing, the majority carrier concentration in the emitter region is intentionally made higher than in the base region, the base region is made very thin, and impurity content is strictly controlled. Thus, once power is applied, due to the forward bias of the emitter junction, the majority carriers in the emitter region (electrons) and the majority carriers in the base region (holes) easily diffuse across the emitter junction toward each other. However, since the former's concentration is much greater than the latter's, the current through the emitter junction is basically electron flow, known as emitter electron flow.

54/6/1 Electrical component structure

1. The electrode is the site of electrochemical reactions in a fuel cell where fuel undergoes oxidation and oxidant undergoes reduction. Its performance depends mainly on catalyst performance, electrode materials, and electrode processing. 2. The main function of the electrolyte membrane is to separate the oxidant from the reductant and conduct ions. 13. The current collector, also known as the bipolar plate, functions to collect current, separate oxidant from reductant, and guide reaction gases. The performance of the current collector mainly depends on its material properties, flow field design, and processing technology.

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