conrad electrical components Germany conrad model conrad price

conrad electrical components are photodetectors that convert light into current or voltage signals depending on the mode of use. The die often uses a PN junction with photosensitive characteristics, which is very sensitive to changes in light, has unidirectional conductivity, and changes its electrical properties when the light intensity varies. Therefore, the current in the circuit can be changed by varying the light intensity. Photodiodes are also called photoelectric diodes. Photodiodes are similar in structure to semiconductor diodes; their die is a PN junction with photosensitive characteristics and has unidirectional conductivity, so during operation a reverse voltage must be applied. When there is no illumination, there is a very small saturated reverse leakage current, i.e., dark current, at which point the photodiode is cut off. When exposed to light, the saturated reverse leakage current increases significantly, forming a photocurrent that varies with the intensity of the incident light. When light irradiates the PN junction, it can generate electron-hole pairs in the PN junction, increasing the density of minority carriers. These carriers drift under reverse voltage, causing the reverse current to increase. Therefore, the current in the circuit can be changed by varying the light intensity.

conrad electrical component classification

Based on the power supply for operation, motors can be divided into DC motors and AC motors. AC motors are further divided into single-phase motors and three-phase motors. According to structure and working principle, motors can be classified into DC motors, asynchronous motors, and synchronous motors. Synchronous motors can be further divided into permanent magnet synchronous motors, reluctance synchronous motors, and hysteresis synchronous motors. Asynchronous motors can be divided into induction motors and AC commutator motors. Induction motors are further divided into three-phase asynchronous motors, single-phase asynchronous motors, and shaded-pole asynchronous motors. AC commutator motors are further divided into single-phase series-wound motors, AC/DC universal motors, and repulsion motors. According to starting and running methods, motors can be classified into capacitor-start single-phase asynchronous motors, capacitor-run single-phase asynchronous motors, capacitor-start-and-run single-phase asynchronous motors, and split-phase single-phase asynchronous motors. According to application, motors can be divided into drive motors and control motors. Drive motors are further divided into motors for power tools, motors for home appliances, and motors for other general small mechanical equipment. Control motors are further divided into stepper motors and servo motors. According to rotor structure, motors can be divided into squirrel-cage induction motors and wound-rotor induction motors. According to operating speed, motors can be classified into high-speed motors, low-speed motors, constant-speed motors, and variable-speed motors.

conrad electrical component principle

A circuit breaker generally consists of a contact system, an arc-extinguishing system, an operating mechanism, a trip unit, and a housing. During a short circuit, the magnetic field generated by the high current overcomes the counter-force spring, and the trip unit actuates the operating mechanism, causing the switch to trip instantaneously. During overload, the current increases, intensifying heat generation; the bimetallic strip deforms to a certain extent to push the mechanism into action (the higher the current, the shorter the action time). Electronic types use current transformers to collect the current magnitude of each phase and compare it with the set value. When the current is abnormal, the microprocessor sends a signal to cause the electronic trip unit to actuate the operating mechanism. The function of a circuit breaker is to connect and disconnect load circuits, as well as to interrupt fault circuits, preventing accident escalation and ensuring safe operation. Arc extinguishing is a critical issue that high-voltage circuit breakers must address. The principle of arc blowing and extinguishing mainly involves cooling the arc to weaken thermal ionization. On the other hand, arc blowing elongates the arc to enhance the recombination and diffusion of charged particles, while simultaneously blowing away charged particles in the arc gap, rapidly restoring the dielectric insulation strength. Low-voltage circuit breakers, also known as automatic air switches, can be used to connect and disconnect load circuits and to control motors that do not start frequently. Their functions are equivalent to the sum of part or all of the functions of electrical components such as knife switches, overcurrent relays, undervoltage relays, thermal relays, and residual current protective devices, making them important protective appliances in low-voltage distribution networks. Low-voltage circuit breakers are widely used due to their multiple protection functions (overload, short circuit, undervoltage protection, etc.), adjustable action values, high breaking capacity, ease of operation, and safety. Structure and working principle: A low-voltage circuit breaker consists of an operating mechanism, contacts, protective devices (various trip units), and an arc-extinguishing system. The main contacts of a low-voltage circuit breaker are closed via manual operation or electric closing. After the main contacts close, the free-trip mechanism locks the main contacts in the closed position. The coil of the overcurrent trip unit and the heating element of the thermal trip unit are connected in series with the main circuit, while 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 pulls in, causing the free-trip mechanism to actuate and the main contacts to disconnect the main circuit. When the circuit is overloaded, the heating element of the thermal trip unit generates heat, causing the bimetallic strip to bend and push the free-trip mechanism into action. When the circuit voltage is too low, the armature of the undervoltage trip unit releases, also causing the free-trip mechanism to actuate. The shunt trip unit is used for remote control; during normal operation, its coil is de-energized. When remote control is required, pressing the start button energizes the coil.

conrad electrical component reliability

1, the impact of environment on relay reliability: The mean time between failures of relays is highest when working under GB and SF. 2, the impact of quality grade on relay reliability: The quality grade of relays has a very significant impact on their reliability performance. 3, the impact of contact form on relay reliability: The contact form of relays also affects their reliability. The reliability of single-throw relays is higher than that of double-throw relays with the same number of poles, and reliability gradually decreases as the number of poles increases. The mean time between failures of single-pole single-throw relays is higher than that of four-pole double-throw relays. 4, the impact of structural type on relay reliability: There are many types of relay structures, and different types all affect their reliability. 5, the impact of temperature on relay reliability: The operating temperature range of relays is within a certain range. As the temperature rises, the mean time between failures of relays gradually decreases. 6, the impact of operating rate on relay reliability: As the operating rate of relays increases, the mean time between failures basically shows an exponential downward trend. Therefore, if the designed circuit requires a very high operating rate of the relay, the relay needs to be carefully inspected during circuit maintenance to replace it in time. 9, the impact of current ratio on relay reliability: The so-called current ratio is the ratio of the working load current of the relay to the rated load current. The current ratio has a great impact on the reliability of relays. Therefore, loads with larger rated currents should be selected in circuit design to reduce the current ratio, which can ensure that the reliability of the relay and even the entire circuit is not reduced due to fluctuations in the working current.

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