TECHM electrical components Germany TECHM model TECHM price

TECHM electrical components are a new type of contactless switching device composed entirely of solid-state electronic components. It utilizes the switching characteristics of electronic components (such as switching transistors, triacs, and other semiconductor devices) to achieve contactless, spark-free circuit connection and disconnection, hence it is also called a "contactless switch". A solid-state relay is a four-terminal active device, where two terminals are input control terminals and the other two are output controlled terminals. It has both amplification drive and isolation functions, making it very suitable for driving high-power switching actuators. Compared to electromagnetic relays, it offers higher reliability, is contactless, has a long service life, fast speed, and low external interference, and has been widely used [1].

TECHM electrical components principle

It is a contactless switching device with relay characteristics that uses semiconductor devices to replace traditional electrical contacts as the switching mechanism. A single-phase solid-state relay is a four-terminal active device, with two input control terminals and two output terminals. Input and output are optically isolated. When a DC or pulse signal is applied to the input terminal and reaches a certain current value, the output terminal switches from the off state to the on state. AC solid-state relays are classified by switching method into zero-crossing turn-on type and random turn-on type; by output switching component into triac output type and anti-parallel SCR type. By installation method, they are classified into pin-type for PCB mounting and chassis-mounted type fixed on metal baseplates. Solid-state relays can be divided into zero-voltage type and phase-control type based on triggering mode.

TECHM electrical components classification

A self-inductor generates a magnetic field around the coil when current flows through it. When the current in the coil changes, the surrounding magnetic field changes accordingly, inducing an electromotive force (EMF) in the coil itself (induced EMF). EMF represents the terminal voltage of an ideal power source in an active component. This phenomenon is called self-inductance. An electronic component made of wound wire with a specific number of turns, capable of producing a certain amount of self-inductance or mutual inductance, is commonly called an inductor coil. To increase inductance, improve the quality factor, and reduce size, a core made of ferromagnetic material is often added. Basic parameters of an inductor include inductance, quality factor, inherent capacitance, stability, rated current, and operating frequency. An inductor consisting of a single coil is called a self-inductor, and its self-inductance is also known as the self-inductance coefficient. Mutual inductance occurs when two inductor coils are placed close to each other; a change in the magnetic field of one coil affects the other. The magnitude of mutual inductance depends on the self-inductance of the coils and the degree of coupling between them. Components manufactured using this principle are called mutual inductors.

TECHM electrical components parameters

Key technical parameters of solid-state relays include: input voltage range, input current, turn-on voltage, turn-off voltage, reverse polarity voltage, rated output current, rated output voltage, output voltage, output leakage current, turn-on time, turn-off time, zero-crossing voltage, maximum surge voltage, electrical system peak, voltage rate of rise, operating temperature, ambient temperature range, dielectric withstand voltage, insulation resistance, electrical system peak, turn-off time, conduction time, output terminal leakage current, maximum on-state voltage transient overvoltage, maximum zero-crossing turn-on voltage, power consumption, maximum surge current, minimum load current, maximum load current, output voltage range, minimum input impedance, reverse polarity voltage, input current, guaranteed turn-off voltage, guaranteed turn-on voltage, input voltage range.

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