Releco electrical components Germany Releco model Releco price

Releco electrical components refer to the aggregate of service equipment provided to a specific group of traffic sources, such as trunk lines, switching devices, control systems, etc. The fundamental research content of traffic theory is to study the relationship between traffic volume, call loss, and bundle capacity; therefore, the line bundle is an important basic concept in traffic theory. A traffic source is the service object of the line bundle, usually referring to user equipment; broadly speaking, the upper-level equipment is the traffic source for the lower-level equipment. In telephone communication, the traffic source is also called the call source. The number of service devices contained in the line bundle is called the bundle capacity. Figure 1 is a schematic diagram of the line bundle. The capacity of this line bundle is V, and it provides service to N traffic sources. Any traffic source initiating a call can occupy an idle service device in the line bundle.

Releco electrical component structure

Common electrodynamic cone paper loudspeakers. Electrodynamic cone loudspeakers were formerly known as paper cone loudspeakers. Although the diaphragm is still mainly made of paper cone, many polymer material diaphragms and metal diaphragms have appeared, so the term cone loudspeaker is more appropriate. Cone paper loudspeakers generally consist of three main parts: the magnetic circuit system (permanent magnet, core pole, magnetic plate), the vibration system (paper cone, voice coil), and the support auxiliary system (centering spider, basket, surround). 1. Voice coil: The voice coil is the drive unit of the cone paper loudspeaker. It is wound with very fine copper wire in two layers on a paper tube, generally with dozens of turns, also known as a coil, and placed in the magnetic gap formed by the magnetic core pole and the magnetic plate. The voice coil is fixed to the paper cone. When the audio current signal is applied to the voice coil, the vibration of the voice coil drives the paper cone to vibrate. 2. Paper cone: There are many types of materials used for the conical diaphragm of cone paper loudspeakers, generally divided into natural fibers and synthetic fibers. Natural fibers often include cotton, wood, wool, silk, etc., while synthetic fibers include rayon, nylon, fiberglass, etc. Since the paper cone is the sound radiation device of the loudspeaker and largely determines the sound performance, any type of paper cone must be lightweight and rigid, and must not deform due to changes in ambient temperature or humidity. 3. Surround: The surround is set to ensure the axial movement of the paper cone along the loudspeaker axis and restrict lateral movement, while also preventing air circulation between the front and rear of the paper cone. In addition to materials commonly used for paper cones, the surround material also uses plastic, natural rubber, etc., which are thermally bonded to the paper cone. 6. Centering spider: The centering spider is used to support the junction of the voice coil and the paper cone, ensuring it remains vertical and not skewed. The centering spider has many concentric rings, allowing the voice coil to move freely up and down in the magnetic gap without lateral movement, ensuring the voice coil does not touch the magnetic plate. The dust cap on the centering spider prevents external dust from falling into the magnetic gap, avoiding friction between dust and the voice coil, which could cause abnormal sounds from the loudspeaker. Generally, a loudspeaker consists of a magnet, frame, centering spider, molded surround, and cone paper cone.

Releco electrical component composition

Internal accessories of circuit breakers: Auxiliary contacts are mechanically linked to the opening and closing mechanism of the main circuit of the circuit breaker. They are mainly used to display the open/closed status of the circuit breaker. Connected to the control circuit of the circuit breaker, they implement control or interlocking of related electrical appliances through the opening and closing of the circuit breaker. Alarm contacts are used for accident alarms in circuit breakers. These contacts only operate after the circuit breaker trips and opens. They are mainly used when the load of the circuit breaker 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, electric bells, buzzers, etc., in the auxiliary circuit to display or remind of the circuit breaker's fault trip status. 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 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 on a short-time duty cycle, and the coil energization time generally cannot 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 attracts the armature, the microswitch switches 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 pressed, the shunt coil will not be energized again, thus avoiding coil damage. When the circuit breaker is reclosed, the microswitch 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 thermal 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 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.

Releco electrical component applications

Wire and cable products used in power systems mainly include bare overhead wires, busbars (busbars), power cables (plastic cables, oil-impregnated paper 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 local telephone cables, TV cables, electronic cables, RF cables, fiber optic cables, data cables, magnet wires, power communication cables, or other composite cables. Except for bare overhead wires, almost all other products in this category are applied, but mainly power cables, magnet wires, data cables, and instrument cables.

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