mecman electrical components Germany mecman model mecman price

mecman electrical components are switches controlled by electromagnets, that is, a combination of an electromagnet and a switch. When the electromagnet coil is energized, it generates electromagnetic attraction, causing the movable iron core to push or pull the switch contacts to close, thereby connecting the controlled circuit. Electromagnetic switches are widely used in various industries, most commonly as contactors in the industrial sector. The electromagnetic switch is the control switch on the starter motor and is one of the three major components of the starter motor (DC motor, transmission engagement mechanism, electromagnetic switch). Its working principle is that the coil generates electromagnetic attraction after being energized, causing the movable iron core to move, thereby on one hand pulling the transmission engagement mechanism to move the starter pinion forward to engage with the engine flywheel ring gear, and on the other hand pushing the switch contacts to connect, causing the DC motor to be energized and operate, thereby driving the engine to start.

mecman electrical component classification

For different application scenarios, the purpose of applying varistors and the voltage/current stress acting on the varistors are not the same, so the requirements for varistors are also different. Paying attention to distinguishing these differences is very important for correct use. According to different purposes, varistors can be divided into two categories: protective varistors and circuit functional varistors. ① Protective varistors: 1, distinguish between power supply protection and signal line or data line protection varistors, as they must meet the requirements of different technical standards. 2, according to the different continuous operating voltages applied to the varistor, varistors across power lines can be divided into AC type or DC type, and the aging characteristics of varistors under these two voltage stresses are different. 10, according to the different abnormal overvoltage characteristics withstandable by the varistor, varistors can be divided into three types: surge suppression type, high power type, and high energy type. ② Surge suppression type: refers to varistors used to suppress transient overvoltages such as lightning overvoltage and switching overvoltage. The occurrence of this transient overvoltage is random and non-periodic, and the peak current and voltage may be very large. The vast majority of varistors belong to this category. ③ High power type: refers to varistors used to absorb continuous pulse groups that appear periodically, such as varistors connected in parallel to switching power supply converters. Here, the impulse voltage appears periodically, and the period is known. The energy value can generally be calculated. The voltage peak is not large, but due to the high frequency of occurrence, its average power is quite large. ④ High energy type: refers to varistors used to absorb magnetic energy in large inductive coils such as generator excitation coils and lifting electromagnet coils. For such applications, the main technical indicator is energy absorption capacity. The protective function of varistors can be repeated many times in most application scenarios, but sometimes they are made into one-time protective devices like current fuses. For example, varistors with short-circuit contacts connected in parallel to the loads of certain current transformers.

mecman electrical component types

Commonly used thermocouples can be divided into two categories: standard thermocouples and non-standard thermocouples. So-called standard thermocouples refer to thermocouples whose relationship between thermoelectric potential and temperature, allowable errors, and unified standard division tables are specified by national standards, and there are matching display instruments available for selection. Non-standardized thermocouples are inferior to standardized thermocouples in terms of usage range or magnitude, and generally do not have unified division tables; they are mainly used for measurement in certain special occasions. Theoretically, any two different conductors (or semiconductors) can be configured into a thermocouple, but as a practical temperature measuring element, it has multiple requirements. To ensure reliability in engineering technology and sufficient measurement accuracy, not all materials can form thermocouples. Generally, the basic requirements for thermocouple electrode materials are: 1, within the temperature measurement range, the thermoelectric properties are stable, do not change with time, have sufficient physical and chemical stability, and are not easily oxidized or corroded; 2, small resistance temperature coefficient, high conductivity, and low specific heat; 3, the thermoelectric potential generated during temperature measurement must be large, and the relationship between thermoelectric potential and temperature should be linear or close to a linear single-valued function; 11, good material reproducibility, high mechanical strength, simple manufacturing process, and low price.

mecman electrical component composition

1. Generally, a fuse consists of three parts: first is the melt part, which is the core of the fuse and plays the role of cutting off the current when it blows. For fuses of the same category and specification, the melt material must be the same, the geometric dimensions must be the same, the resistance value should be as small as possible and consistent, and most importantly, the fusing characteristics must be consistent. Household fuses are commonly made of lead-antimony alloy; second is the electrode part, usually having two electrodes, which are important components connecting the melt to the circuit. It must have good conductivity and should not produce significant installation contact resistance; third is the bracket part. The melt of a fuse is generally slender and soft. The role of the bracket is to fix the melt 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 produce phenomena such as fracture, deformation, combustion, or short circuits during use. 2. Arc extinguishing device: Fuses used in power circuits and high-power equipment not only have the three parts of general fuses but also have an arc extinguishing device. This is because the circuits protected by such fuses not only have larger operating currents, but also have very high voltages at both ends when the melt blows. Often, the melt has melted (blown) or even vaporized, but the current has not been cut off. The reason is that at the moment of blowing, arcing occurs between the two electrodes of the fuse under the action of voltage and current. This arc extinguishing device must have strong insulation and good thermal conductivity, and exhibit negative electronegativity. Quartz sand is a commonly used arc extinguishing material. 7. Fusing indication device: Some fuses have a fusing indication device. Its role is to cause certain appearance changes to itself after the fuse operates (blows), making it easy for maintenance personnel to discover, such as lighting up, changing color, or popping out solid indicators.

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