idv electrical components, German idv models, idv prices

idv electrical components refer to an electrical device that disconnects the circuit by melting the fusible element with the heat generated by itself when the current exceeds a specified value. A fuse is a current protection device made based on this principle: after the current exceeds the specified value for a period of time, the heat generated by the fuse melts the fusible element, thereby disconnecting the circuit. Fuses are widely used in high- and low-voltage distribution systems, control systems, and electrical equipment as protective devices against short circuits and overcurrent, making them one of the most commonly used protective components. A metal conductor is used as the fusible element connected in series in the circuit. When overload or short-circuit current passes through the fusible element, it melts due to self-heating, thereby interrupting the circuit. Fuses have a simple structure and are easy to use, and are widely used in power systems, various electrical equipment, and household appliances as protective devices.

idv electrical component functions

A multimeter can not only measure the resistance of the object under test, but also AC and DC voltages, including DC voltage. Some multimeters can even measure the main parameters of transistors and the capacitance of capacitors. Proficient mastery of multimeter usage is one of the most basic skills in electronic technology. Common multimeters include analog multimeters and digital multimeters. An analog multimeter is a multifunctional measuring instrument with a meter head as the core component, and the measured value is read from the pointer indication. The measured value of a digital multimeter is directly displayed in numerical form on an LCD screen, which is convenient to read, and some models also feature voice prompts. A multimeter is an instrument that integrates a voltmeter, ammeter, and ohmmeter using a common meter head. The DC current range of a multimeter is a multi-range DC ammeter. Connecting a shunt resistor in parallel with the meter head expands its current range. The DC voltage range of a multimeter is a multi-range DC voltmeter. Connecting a voltage-divider resistor in series with the meter head expands its voltage range. Different voltage-divider resistors correspond to different ranges. The meter head of a multimeter is a magnetoelectric measuring mechanism that can only pass DC current; diodes are used to convert AC to DC, thereby enabling AC measurement.

idv electrical component principles

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 force, and the trip unit activates the operating mechanism, causing the switch to trip instantaneously. During an overload, the current increases, intensifying heat generation, and the bimetallic strip deforms to a certain extent to activate the mechanism (the higher the current, the shorter the action time). Electronic types use current transformers to collect the current of each phase and compare it with the set value; when the current is abnormal, the microprocessor sends a signal to activate the electronic trip unit, which drives the operating mechanism. The function of a circuit breaker is to connect and disconnect load circuits, as well as to interrupt fault circuits to prevent accident expansion and ensure safe operation. Arc extinguishing is a critical issue for high-voltage circuit breakers. The principle of blow-out arc extinguishing mainly involves cooling the arc to reduce thermal ionization, and on the other hand, elongating the arc through blowing to enhance the recombination and diffusion of charged particles, while dispersing charged particles in the arc gap to rapidly 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 control motors that do not start frequently. Their functions equate to the sum of part or all of the functions of electrical devices 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 offer multiple protection functions (overload, short circuit, undervoltage protection, etc.), adjustable action values, high breaking capacity, convenient operation, and safety, leading to their widespread application. Structure and working principle: Low-voltage circuit breakers consist 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 manually or electrically. After the main contacts close, the free-trip mechanism locks them 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 attracts, activating the free-trip mechanism and opening 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 activate the free-trip mechanism. When the circuit voltage is too low, the armature of the undervoltage trip unit releases, also activating the free-trip mechanism. 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.

idv electrical component applications

Thermistors can also be used as electronic circuit components for temperature compensation in instrument circuits and cold-junction temperature compensation for thermocouples. Utilizing the self-heating characteristics of NTC thermistors enables automatic gain control, forming RC oscillator amplitude-stabilizing circuits, delay circuits, and protection circuits. When the self-heating temperature is much higher than the ambient temperature, the resistance is also related to the environmental heat dissipation conditions. Therefore, this characteristic of thermistors is often utilized in anemometers, flow meters, gas analyzers, and thermal conductivity analysis to create specialized detection elements. PTC thermistors are mainly used for overheat protection of electrical equipment, contactless relays, constant temperature control, automatic gain control, motor starting, time delay, automatic degaussing of color TVs, fire alarms, and temperature compensation. Main disadvantages: (1) The relationship between resistance and temperature is highly nonlinear; (2) Poor consistency and interchangeability of components; (3) Components are prone to aging and have poor stability; (4) Except for special high-temperature thermistors, most thermistors are only suitable for the 0–154℃ range, which must be noted during use.

Weidou Intelligent Technology specializes in selling German idv connectors, idv switches, idv relays, idv controllers, idv plugs, idv sensors, idv resistors, idv capacitors, idv buses, idv modules, idv cables, idv power supplies, idv interfaces, idv gateways, and idv circuit breakers. idv products are original imports from Germany. Customers are welcome to inquire and place orders.