Schrack electrical components Germany Schrack model Schrack price

Schrack electrical components utilize the good conductivity and fluidity of mercury to control the opening and closing of electrical circuits. It consists of a glass tube, mercury, fixed electrodes, lead wires, etc. After evacuating the air from the tube, it is filled with various gases and sealed. It is suitable for environments with dust, oil, water vapor, and corrosive gases, and can also be used as an explosion-proof switch in places with explosive gases. Given the high surface tension and specific gravity of the mercury inside the tube, along with its fluidity, the position of the mercury changes immediately with even a slight tilt of the glass tube, and it contacts the electrodes via surface contact, thus enabling the switching of high AC and DC currents. Additionally, this type of switch features a service life of up to several million cycles at rated current, compact size, high sensitivity, no mechanical noise, and low cost, making it widely used as a switch for automatic control.

Schrack electrical component structure

The structure of a power cord is not very complex, but it cannot be fully understood just by looking at the surface; proper study requires professional knowledge of the power cord's structure. The main components of a power cord are the outer sheath, inner sheath, and conductor. Common conductive materials include copper and aluminum metal strands. (1) The outer sheath, also known as the protective sheath, is the outermost layer of the power cord. This layer protects the power cord and possesses robust characteristics such as high temperature resistance, low temperature resistance, resistance to natural light interference, good flexibility, long service life, and environmentally friendly materials. (2) The inner sheath, also known as the insulation sheath, is an essential intermediate part of the power cord. As the name suggests, its primary function is insulation, ensuring the safety of power transmission by preventing leakage between the copper wires and the air. The material of the insulation sheath must be soft to ensure it fits well within the intermediate layer. (3) Copper wires are the core part of the power cord, serving as the carrier for current and voltage. The density of the copper wires directly affects the quality of the power cord. The material of the power cord is also a critical factor in quality control, with the quantity and flexibility of the copper wires being important considerations. (4) The inner sheath is a layer of material wrapped between the shielding layer and the wire core, typically made of polyvinyl chloride (PVC) or polyethylene (PE). Low-smoke zero-halogen materials are also used. Used in accordance with process regulations, it prevents the insulation layer from contacting water, air, or other objects, thereby avoiding moisture ingress and mechanical damage to the insulation layer.

Schrack electrical component functions

Antennas radiate radio waves and also receive radio waves. However, what the transmitter sends to the antenna through the feeder is not radio waves, nor can the receiving antenna send radio waves directly to the receiver through the feeder; an energy conversion process is required. Below, we analyze the signal transmission process using radio communication equipment as an example to illustrate the energy conversion role of the antenna. At the transmitting end, the modulated high-frequency oscillating current (energy) generated by the transmitter is input to the transmitting antenna via the feed device (the feed device can transmit current waves or electromagnetic waves directly, depending on frequency and form). The transmitting antenna converts the high-frequency current or guided wave (energy) into radio waves—free electromagnetic waves (energy)—radiating them into the surrounding space. At the receiving end, radio waves (energy) are converted by the receiving antenna into high-frequency current or guided wave (energy), which is then transmitted to the receiver via the feed device. From the above process, it can be seen that the antenna is not only a device for radiating and receiving radio waves but also an energy converter, serving as the interface device between the circuit and space.

Schrack electrical component principle

1, Emitter injects electrons into the base region: The power supply Ub is applied across the emitter junction through resistor Rb. The emitter junction is forward-biased, causing the majority carriers (free electrons) in the emitter region to continuously cross the emitter junction into the base region, forming the emitter current Ie. Simultaneously, majority carriers in the base region diffuse toward the emitter region, but since their concentration is far lower than that of the emitter region carriers, this current can be neglected. Therefore, the emitter junction current is primarily an electron flow. 2, Diffusion and recombination of electrons in the base region: After entering the base region, electrons first accumulate near the emitter junction, gradually forming an electron concentration gradient. Driven by this concentration difference, the electron flow diffuses through the base region toward the collector junction, where they are pulled into the collector region by the electric field of the collector junction, forming the collector current Ic. A very small portion of electrons (due to the thinness of the base region) recombine with holes in the base region. The ratio of the diffused electron flow to the recombined electron flow determines the amplification capability of the transistor. 3, Collector collects electrons: Due to the large reverse voltage applied externally to the collector junction, the electric field force generated by this reverse voltage prevents electrons in the collector region from diffusing into the base region and simultaneously pulls electrons diffusing near the collector junction into the collector region, thereby forming the main collector current Icn. Additionally, minority carriers (holes) in the collector region undergo drift motion, flowing toward the base region to form a reverse saturation current, denoted by Icbo. Its value is very small but extremely sensitive to temperature.

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