schlegel electrical components Germany schlegel model schlegel price

schlegel electrical components are fuses that can be operated multiple times, known in Japan as permanent fuses. Immediately after interrupting overload or short-circuit current, the fusible element automatically restores to its original state. The housing is made of austenitic stainless steel, with a beryllium oxide ceramic core embedded in the center. Glass filler between the stainless steel and the ceramic core provides sealing and secures the ceramic core. Metallic sodium is filled into the fine pores of the ceramic core as the fusible element, and the void behind the piston is filled with argon gas to press the metallic sodium. Under normal operating conditions, current can enter from lead terminal A, pass through the metallic sodium in the fine pores of the ceramic core, conduct to the stainless steel housing, and exit via output terminal B. When short-circuit current passes through the fuse, it rapidly heats the metallic sodium in the fine pores of the ceramic core, turning it from solid into high-temperature, high-pressure plasma vapor. The resistivity increases rapidly, strongly limiting the short-circuit current and interrupting it instantly. At the end of interruption, the sodium vapor immediately returns to liquid and solid states, while the argon gas pushes the piston again to compress the metallic sodium, re-establishing the circuit connection.

schlegel electrical component composition

1. A general fuse consists of three parts: First, the fusible element, which is the core of the fuse and cuts off the current when it melts. For fuses of the same type and rating, the fusible elements must have the same material, identical geometric dimensions, minimal and consistent resistance values, and most importantly, consistent fusing characteristics. Household fuses are commonly made of lead-antimony alloy. Second, the electrode part, usually consisting of two electrodes, is an important component connecting the fusible element to the circuit. It must have good conductivity and should not produce significant installation contact resistance. Third, the holder part. Since fuse elements are generally thin and flexible, the holder's role is to fix the element and make the three parts a rigid whole for easy installation and use. It must have good mechanical strength, insulation, heat resistance, and flame retardancy, and should not break, deform, burn, or cause short circuits during use. 2. Arc extinguishing device: Fuses used in power circuits and high-power equipment not only have the three general parts but also include an arc extinguishing device. This is because the circuits protected by such fuses not only have higher operating currents, but also experience high voltage across the terminals when the element melts. Often, even if the element has melted (fused) or even vaporized, the current may not be interrupted due to arcing between the two electrodes caused by voltage and current at the moment of fusing. This arc extinguishing device must have strong insulation, good thermal conductivity, and negative electronegativity. Quartz sand is a commonly used arc-extinguishing material. 5. Fusing indication device: Some fuses have a fusing indication device. Its function is to undergo a visible change in appearance after the fuse operates (melts), making it easy for maintenance personnel to detect, such as emitting light, changing color, or popping out a solid indicator.

schlegel electrical component 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 correspondingly. This changing magnetic field induces an electromotive force (induced EMF) in the coil itself (EMF represents the terminal voltage of an ideal power source for active components), which is called self-induction. Electronic components made by winding wire with a certain number of turns, capable of producing a certain amount of self-inductance or mutual inductance, are often called inductor coils. To increase inductance, improve the quality factor, and reduce size, iron cores or magnetic cores made of ferromagnetic materials are often added. Basic parameters of inductors include inductance, quality factor, inherent capacitance, stability, rated current, and operating frequency. An inductor composed of a single coil is called a self-inductor, and its self-inductance is also known as the self-induction coefficient. Mutual induction occurs when two inductor coils are close to each other; a change in the magnetic field of one coil affects the other. This effect is called mutual induction. The magnitude of mutual induction depends on the self-inductance of the coils and the degree of coupling between them. Components manufactured using this principle are called mutual inductors.

schlegel electrical component composition

Internal accessories of circuit breakers: Auxiliary contacts are mechanically linked to the opening and closing mechanism of the circuit breaker's main circuit. They are mainly used to display the open/closed status of the circuit breaker. Connected to the control circuit, they control or interlock related appliances through the opening and closing of the circuit breaker. Alarm contacts are used for accident alarms in circuit breakers. These contacts operate only after the circuit breaker trips and opens. They are mainly used when the load experiences faults such as overload, short circuit, or undervoltage, causing free tripping. The alarm contact switches from its normally open position to a closed position, connecting indicator lights, bells, buzzers, etc., in the auxiliary circuit to display or alert the fault trip status of the circuit breaker. Since the probability of free tripping due to load faults is relatively low. Shunt release: A shunt release is a tripping device excited by a voltage source, independent of the main circuit voltage. It is an accessory for remote opening operation. 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 in short-time duty; the coil energization time generally must not exceed 2S, 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 pulls in via the armature, the microswitch switches from normally closed to normally open. Since the control circuit for the shunt release power is cut off, even if the button is held down manually, the shunt coil will not be energized, avoiding coil damage. After the circuit breaker resets and closes, the microswitch returns to the normally closed position. Undervoltage release: An undervoltage release is a tripping 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 power, protecting downstream loads or electrical equipment from undervoltage damage. During use, the undervoltage release coil is connected to the power side of the circuit breaker; the circuit breaker can only close after the undervoltage release is energized.

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