TET14-20 in stock German TET14-20 electrical components TET14-20 inventory

TET14-20 electrical component is a transducer that converts a changing magnetic field into a change in output voltage. Hall sensors are primarily used for measuring magnetic fields, and can also measure physical quantities that generate or affect magnetic fields, such as in proximity switches, Hall elements, position measurement, speed measurement, and current measurement devices. In its simplest form, the sensor acts as an analog transducer, directly returning a voltage. In a known magnetic field, its distance from the Hall plate can be set. Using multiple sensors, the relative position of the magnet can be inferred. The current through a conductor generates a magnetic field that varies with the current, and Hall effect sensors can measure current without interfering with it. A typical construction integrates the sensor with a wound magnetic core or a permanent magnet next to the conductor being measured. Usually, Hall effect sensors are connected to circuits, allowing the device to operate in digital (on/off) mode, in which case it can be referred to as a switch. Industrial equipment such as cylinders are also used in everyday devices; for example, some printers use them to monitor paper absence and open covers. When high reliability is required for keyboards, Hall sensors are designed into the keys. Hall effect sensors are commonly used to measure wheel and axle speeds, such as in internal combustion engine ignition timing or tachometers. They are used in brushless DC motors to detect the position of permanent magnets. A wheel equipped with two equidistant magnets causes the voltage on the sensor to peak twice per cycle; this setup is often used to calibrate the speed of disk drives.

TET14-20 electrical component function

In DC circuits, a capacitor is equivalent to an open circuit. A capacitor is a component capable of storing electric charge and is one of the most commonly used electronic components. Starting with the structure of a capacitor: the simplest capacitor consists of two end plates and an insulating dielectric medium in between (including air). When energized, the plates become charged, forming a voltage (potential difference), but due to the insulating material in between, the entire capacitor does not conduct electricity. However, this is under the premise that the capacitor's critical voltage (breakdown voltage) is not exceeded. We know that any material is relatively insulating; when the voltage across a material increases to a certain level, the material can conduct electricity. We call this voltage the breakdown voltage. Capacitors are no exception; once a capacitor is broken down, it is no longer an insulator. However, at the secondary school level, such voltages are not seen in circuits, so they operate below the breakdown voltage and can be regarded as insulators. But in AC circuits, because the direction of current changes over time according to a certain functional relationship. And the charging and discharging process of a capacitor takes time; during this period, a changing electric field is formed between the plates, and this electric field is also a function that changes with time. In fact, current passes through the capacitor in the form of an electric field.

TET14-20 electrical component principle

A circuit breaker generally consists of a contact system, arc extinguishing system, operating mechanism, trip unit, and housing. During a short circuit, the magnetic field generated by the large current overcomes the reaction spring, and the trip unit pulls the operating mechanism to act, causing the switch to trip instantaneously. During overload, the current increases, heat generation intensifies, and the bimetallic strip deforms to a certain extent to push the mechanism into action (the greater the current, the shorter the action time). There are electronic types that use current transformers to collect the current magnitude of each phase, compare it with the set value, and when the current is abnormal, the microprocessor sends a signal to make the electronic trip unit drive the operating mechanism. The function of a circuit breaker is to cut off and connect load circuits, as well as to cut off fault circuits, prevent accident expansion, and ensure safe operation. Arc extinguishing is a problem that high-voltage circuit breakers must solve. The principle of blowing out and extinguishing arcs is mainly to cool the arc to weaken thermal ionization; on the other hand, blowing the arc elongates it to strengthen the recombination and diffusion of charged particles, while blowing away charged particles in the arc gap to quickly restore the insulation strength of the medium. Low-voltage circuit breakers, also known as automatic air switches, can be used to connect and disconnect load circuits, and can also be used to control motors that do not start frequently. Its function is equivalent to the sum of part or all of the functions of electrical appliances such as knife switches, overcurrent relays, undervoltage relays, thermal relays, and residual current protective devices. It is an important protective electrical appliance in low-voltage distribution networks. Low-voltage circuit breakers have multiple protection functions (overload, short circuit, undervoltage protection, etc.), adjustable action values, high breaking capacity, convenient operation, safety, and other advantages, so they are widely used. Structure and working principle: Low-voltage circuit breakers consist of an operating mechanism, contacts, protection devices (various trip units), arc extinguishing systems, etc. The main contacts of a low-voltage circuit breaker are closed by manual operation or electric closing. After the main contacts are closed, the free-trip mechanism locks the main contacts in the closed position. The coil of the overcurrent trip unit and the thermal element of the thermal trip unit are connected in series with the main circuit, and the coil of the undervoltage trip unit is connected in parallel with the power supply. When a short circuit or severe overload occurs in the circuit, the armature of the overcurrent trip unit attracts, causing the free-trip mechanism to act and the main contacts to disconnect the main circuit. When the circuit is overloaded, the thermal element of the thermal trip unit heats up, causing the bimetallic strip to bend and push the free-trip mechanism into action. When the circuit voltage is low, the armature of the undervoltage trip unit releases, also causing the free-trip mechanism to act. The shunt trip unit is used for remote control; during normal operation, its coil is de-energized. When remote control is needed, pressing the start button energizes the coil.

TET14-20 electrical component principle

When the voltage applied to a varistor is lower than its threshold, the current flowing through it is extremely small, and it is equivalent to a resistor with infinite resistance. That is to say, when the voltage applied to it is lower than its threshold, it is equivalent to a switch in the open state. When the voltage applied to a varistor exceeds its threshold, the current flowing through it surges, and it is equivalent to a resistor with infinitesimal resistance. That is to say, when the voltage applied to it is higher than its threshold, it is equivalent to a switch in the closed state. 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 an instantaneous surge voltage appears (exceeding the breakdown voltage of the surge absorber), the impedance of the surge absorber becomes low (only a few ohms) and causes a short circuit in the line, thereby protecting electronic products or more expensive components.

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