MELKUSMELKUS electrical components Germany MELKUSMELKUS model MELKUSMELKUS price

MELKUSMELKUS electrical component is a current-limiting element. After connecting a resistor in the circuit, the resistance value is fixed, generally with two pins, and it can limit the magnitude of the current passing through the branch to which it is connected. A resistor whose resistance value cannot be changed is called a fixed resistor. A resistor whose resistance value can be changed is called a potentiometer or variable resistor. An ideal resistor is linear, meaning the instantaneous current through the resistor is proportional to the applied instantaneous voltage. Variable resistors used for voltage division. On the exposed resistive body, one or two movable metal contacts are tightly pressed. The contact position determines the resistance between either end of the resistive body and the contact. There is a definite functional relationship between terminal voltage and current. It is a two-terminal device that reflects the ability to convert electrical energy into other forms, represented by the letter R, with the unit ohm Ω. Actual devices such as light bulbs, heating wires, and resistors can all be represented as resistor elements. The resistance value of a resistive element is generally related to temperature, material, length, and cross-sectional area. The physical quantity measuring the extent to which resistance is affected by temperature is the temperature coefficient, defined as the percentage change in resistance value when the temperature rises by 1 ℃. The main physical characteristic of resistance is the conversion of electrical energy into thermal energy; it can also be said to be an energy-consuming element, generating internal energy when current passes through it. Resistors usually play the role of voltage division and current shunting in circuits. For signals, both AC and DC signals can pass through resistors.

MELKUSMELKUS electrical component composition

Internal accessories of circuit breakers: Auxiliary contacts are contacts mechanically linked with the opening and closing mechanism of the main circuit of the circuit breaker, mainly used to display the open/closed status of the circuit breaker. Connected in the control circuit of the circuit breaker, they implement control or interlocking on related electrical appliances through the opening and closing of the circuit breaker. Alarm contacts are used for accident alarms of the circuit breaker, and this contact only acts after the circuit breaker trips and opens. It is 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 the original normally open position to the closed position, connecting indicator lights, electric bells, buzzers, etc., in the auxiliary circuit to display or remind of the fault trip status of the circuit breaker. Since the probability of free tripping due to load faults is not high. Shunt release: A shunt release is a release 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 equal to any voltage between 70% and 110% of the rated control power supply voltage, the circuit breaker can be reliably opened. The shunt release operates in short-time duty, and the coil energization time generally cannot exceed 10S, otherwise the coil will be burned out. To prevent coil burnout in molded case circuit breakers, a micro switch is connected in series with the shunt release coil. When the shunt release pulls in through the armature, the micro switch 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 held down, the shunt coil will not be energized again, thus avoiding coil damage. When the circuit breaker is reclosed, the micro switch returns to the normally closed position. Undervoltage release: An undervoltage release is a release that causes the circuit breaker to open with or without delay when its terminal voltage drops to a specified range. Under hot conditions, it should 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 the load appliances or electrical equipment downstream of the circuit breaker from undervoltage damage. During use, the undervoltage release coil is connected to the power side of the circuit breaker, and the circuit breaker can only be closed after the undervoltage release is energized.

MELKUSMELKUS electrical component applications

Wire and cable products adopted in power systems mainly include overhead bare wires, busbars (busbars), power cables (plastic cables, oil-paper power cables (basically replaced by plastic power cables), rubber-sheathed cables, overhead insulated cables), branch cables (replacing some busbars), magnet wires, and electrical equipment wires and cables for power equipment. Wire and cable products used in information transmission systems mainly include telephone cables, TV cables, electronic cables, RF cables, fiber optic cables, data cables, magnet wires, power communication cables, or other composite cables. Except for overhead bare wires, almost all other products in this part have applications, but mainly power cables, magnet wires, data cables, and instrument and meter cables.

MELKUSMELKUS electrical component composition

A diode is formed by a PN junction plus corresponding electrode leads and package casing. Using different doping processes, through diffusion, P-type semiconductor and N-type semiconductor are fabricated on the same semiconductor (usually silicon or germanium) substrate, forming a space charge region at their interface called the PN junction. The electrode led out from the P region is called the anode, and the electrode led out from the N region is called the cathode. Due to the unidirectional conductivity of the PN junction, when the diode conducts, the current direction is from the anode through the interior of the tube to the cathode. A diode has two electrodes; the electrode led out from the P region is the positive pole, also called the anode; the electrode led out from the N region is the negative pole, also called the cathode.

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