keller electrical components German keller models keller prices

keller electrical components are specifically designed to suppress high-frequency noise and spike interference on signal and power lines, and also have the ability to absorb electrostatic pulses. Ferrite beads are used to absorb ultra-high-frequency signals. For example, some RF circuits, PLL, oscillator circuits, and circuits containing ultra-high-frequency memory (DDR SDRAM, RAMBUS, etc.) all require ferrite beads at the power input. Inductors are energy storage components used in LC oscillator circuits, medium and low-frequency filter circuits, etc., and their application frequency range rarely exceeds 50MHZ. Ferrite beads have high resistivity and permeability, equivalent to a resistor and inductor in series, but both resistance and inductance vary with frequency.

keller electrical component classification

There are various classification methods for thyristors: (1) Classification by turn-off, conduction, and control methods: Thyristors can be classified into ordinary thyristors, bidirectional thyristors, reverse-conducting thyristors, gate-turn-off thyristors, BTG thyristors, temperature-controlled thyristors, and light-controlled thyristors based on their turn-off, conduction, and control methods. (2) Classification by pins and polarity: Thyristors can be classified into two-pin thyristors, three-pin thyristors, and four-pin thyristors based on their pins and polarity. (3) Classification by package type: Thyristors can be classified into metal-packaged thyristors, plastic-packaged thyristors, and ceramic-packaged thyristors based on their package type. Among these, metal-packaged thyristors are further divided into bolt-type, flat-type, and round-case types; plastic-packaged thyristors are divided into types with heat sinks and types without heat sinks. (4) Classification by current capacity: Thyristors can be classified into high-power thyristors, medium-power thyristors, and low-power thyristors based on current capacity. Typically, high-power thyristors mostly use metal casing packages, while medium and low-power thyristors mostly use plastic or ceramic packages. (5) Classification by turn-off speed: Thyristors can be classified into ordinary thyristors and high-frequency (fast) thyristors based on their turn-off speed. (6) Zero-crossing triggering - generally used for power regulation, i.e., triggering occurs when the phase of the sinusoidal AC voltage crosses zero. Triggering must occur at the zero-crossing point to conduct the thyristor. (7) Non-zero-crossing triggering - the thyristor can be triggered to conduct regardless of the phase of the AC voltage. Commonly, this is phase-shift triggering, which changes the output percentage by altering the conduction angle (phase angle) of the sinusoidal AC voltage.

keller electrical component composition

A sensor generally consists of four parts: a sensing element, a conversion element, a conditioning circuit, and an auxiliary power supply. The sensing element directly senses the measured quantity and outputs a physical signal with a definite relationship to the measured quantity; the conversion element converts the physical signal output by the sensing element into an electrical signal; the conditioning circuit is responsible for amplifying and modulating the electrical signal output by the conversion element; the conversion element and conditioning circuit generally also require an auxiliary power supply.

keller electrical component parameters

(1) Rated operating voltage: refers to the voltage required by the coil for the relay to operate normally. Depending on the relay model, it can be AC voltage or DC voltage. (2) DC resistance: refers to the DC resistance of the coil in the relay, which can be measured with a multimeter. (3) Pull-in current: refers to the minimum current required for the relay to perform the pull-in action. During normal use, the supplied current must be slightly greater than the pull-in current so that the relay can work stably. For the operating voltage applied to the coil, it should generally not exceed the rated operating voltage; otherwise, excessive current will be generated, burning out the coil. (4) Release current: refers to the maximum current at which the relay performs the release action. When the current in the pull-in state of the relay decreases to a certain level, the relay will return to the de-energized release state. At this time, the current is much smaller than the pull-in current. (5) Contact switching voltage and current: refer to the voltage and current that the relay is allowed to handle. It determines the magnitude of voltage and current that the relay can control. This value must not be exceeded during use; otherwise, the relay contacts are easily damaged.

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