trafo-technik electrical components Germany trafo-technik model trafo-technik price

trafo-technik electrical components are switches controlled by electromagnets, that is, a combination of an electromagnet and a switch. When the electromagnet coil is energized, it generates electromagnetic attraction, causing the movable iron core to push or pull the switch contacts to close, thereby connecting the controlled circuit. Electromagnetic switches are widely used in various industries, most commonly as contactors in the industrial sector. An electromagnetic switch is the control switch on a starter motor and is one of the three main components of a starter (DC motor, transmission engagement mechanism, electromagnetic switch). Its working principle is that the coil generates electromagnetic attraction when energized, causing the movable iron core to move, which on one hand pulls the transmission engagement mechanism to move the starter pinion forward to engage with the engine flywheel ring gear, and on the other hand pushes the switch contacts to connect, allowing the DC motor to operate and thus drive the engine to start.

trafo-technik electrical component applications

The main application of rectifiers is to convert AC power to DC power. Since all electronic devices require DC, but utility power supply is AC, rectifiers are indispensable inside the power supplies of all electronic devices unless batteries are used. Converting the voltage of a DC power supply is much more complex. One method of DC-DC conversion is to first convert the power to AC (using a device called an inverter), then use a transformer to change the AC voltage, and finally rectify it back to DC power. Rectifiers are also used for demodulation of amplitude-modulated radio signals. The signal may be amplified (increasing the signal amplitude) before demodulation; if not amplified, diodes with very low voltage drop must be used. When using rectifiers for demodulation, care must be taken to match capacitors and load resistors. If the capacitance is too small, excessive high-frequency components will pass through; if too large, the signal will be suppressed. Rectifier devices are also used to provide fixed-polarity voltage required for electric welding. The output current of such circuits sometimes needs to be controlled; in this case, thyristors (a type of silicon-controlled rectifier) replace the diodes in bridge rectifiers, and their voltage output is adjusted via phase-control triggering. Thyristors are also used in railway locomotive systems at various levels to achieve fine tuning of traction motors.

trafo-technik electrical component composition

Internal accessories of circuit breakers: Auxiliary contacts are mechanically linked to the opening and closing mechanism of the main circuit of the circuit breaker. They are mainly used to indicate the open/closed status of the circuit breaker. Connected to the control circuit of the circuit breaker, they implement control or interlocking of related electrical appliances through the opening and closing of the circuit breaker. Alarm contacts are used for accident alarms in circuit breakers. These contacts only act after the circuit breaker trips and opens. They are mainly used when the load of the circuit breaker experiences faults such as overload, short circuit, or undervoltage, causing free tripping. The alarm contact changes from its normally open position to a closed position, connecting indicator lights, electric bells, buzzers, etc., in the auxiliary circuit to display or remind of the circuit breaker's fault trip status. Since the probability of free tripping due to load faults is relatively low. Shunt release: A shunt release is a release device excited by a voltage source, and its voltage is independent of the main circuit voltage. A shunt release is an accessory for remote operation of opening. When the power supply voltage is any value between 70% and 110% of the rated control power supply voltage, the circuit breaker can reliably open. The shunt release operates on a short-time duty cycle; the coil energization time generally must not exceed 11S, otherwise the coil will burn out. To prevent coil burnout in molded case circuit breakers, a microswitch is connected in series with the shunt release coil. When the shunt release attracts the armature, the microswitch changes from normally closed to normally open. Since the control circuit of the shunt release power supply is cut off, even if the button is manually pressed, the shunt coil will not be energized, thus avoiding coil damage. After the circuit breaker is reset and closed, the microswitch returns to the normally closed position. Undervoltage release: An undervoltage release is a device that causes the circuit breaker to open with or without delay when its terminal voltage drops to a specified range. Under thermal conditions, it must ensure reliable closing of the circuit breaker. Therefore, when a certain voltage drop occurs in the power supply voltage of the protected circuit, it can automatically open the circuit breaker to cut off the power, protecting downstream load appliances or electrical equipment from damage due to undervoltage. During use, the undervoltage release coil is connected to the power side of the circuit breaker; the circuit breaker can only be closed after the undervoltage release is energized.

trafo-technik electrical component principle

The forward characteristic of the volt-ampere characteristic curve of a Zener diode is similar to that of a standard diode. In the reverse characteristic, when the reverse voltage is below the reverse breakdown voltage, the reverse resistance is very high, and the reverse leakage current is extremely small. However, when the reverse voltage approaches the critical value of the reverse voltage, the reverse current increases suddenly, known as breakdown. At this critical breakdown point, the reverse resistance drops suddenly to a very small value. Although the current changes over a wide range, the voltage across the diode remains basically stable near the breakdown voltage, thereby achieving the voltage stabilization function of the diode.

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