evg martens electrical components, German evg martens models, evg martens pricing

evg martens electrical components are electrical control devices. When the change in the input quantity (excitation) meets specified requirements, they cause a predetermined step change in the controlled quantity within the electrical output circuit. They facilitate interaction between the control system (also known as the input circuit) and the controlled system (also known as the output circuit). Typically used in automated control circuits, they function as "automatic switches" that use small currents to control large currents. Therefore, they perform roles such as automatic regulation, safety protection, and circuit switching in electrical circuits. A relay is an electrical control device that, when provided with a specified input for a sufficient duration, causes a predetermined step change in the controlled quantity in the electrical output circuit. When the input decreases to a certain level and remains there for a sufficient duration, the device returns to its initial state.

evg martens electrical component classification

In different application scenarios, the purpose of using varistors varies, and the voltage/current stress applied to them differs; therefore, requirements for varistors also differ. Distinguishing these differences is crucial for correct usage. Based on the application purpose, varistors can be categorized into two main types: protection varistors and circuit-function varistors. ① Protection varistors: 1, distinguish between power supply protection varistors and those for signal line or data line protection, as they must meet different technical standard requirements. 2, based on the continuous operating voltage applied to the varistor, varistors across power lines can be classified into AC type or DC type; varistors exhibit different aging characteristics under these two voltage stresses. 14, based on the abnormal overvoltage characteristics withstandable by the varistor, varistors can be classified into 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 such transient overvoltages is random and non-periodic, and peak current/voltage values can be very high. The vast majority of varistors belong to this category. ③ High-power type: refers to varistors used to absorb continuous pulse trains occurring periodically, such as varistors connected in parallel to switching power supply converters. Here, impulse voltages occur periodically with known periods, and energy values can generally be calculated. Although peak voltage is not significantly high, the average power is considerable due to the high frequency of occurrence. ④ High-energy type: refers to varistors used to absorb magnetic energy from large inductive coils such as generator excitation coils and lifting electromagnet coils. For such applications, the primary technical indicator is energy absorption capacity. In most application scenarios, the protective function of varistors can be exercised repeatedly; however, they are sometimes designed as one-time protective devices similar to current fuses, such as varistors with short-circuit contacts connected in parallel to certain current transformer loads.

evg martens electrical component classification

Based on the working power supply of the motor, motors can be classified into DC motors and AC motors. Among them, AC motors are further divided into single-phase motors and three-phase motors. According to structure and working principle, motors can be classified into DC motors, asynchronous motors, and synchronous motors. Synchronous motors can be further divided into permanent magnet synchronous motors, reluctance synchronous motors, and hysteresis synchronous motors. Asynchronous motors can be divided into induction motors and AC commutator motors. Induction motors include three-phase asynchronous motors, phase asynchronous motors, and shaded-pole asynchronous motors. AC commutator motors include single-phase series-wound motors, AC/DC universal motors, and repulsion motors. Based on starting and running methods, motors can be classified into capacitor-start single-phase asynchronous motors, capacitor-run single-phase asynchronous motors, capacitor-start-run single-phase asynchronous motors, and split-phase single-phase asynchronous motors. Based on application, motors can be classified into drive motors and control motors. Drive motors include motors for power tools, household appliances, and other general small mechanical equipment. Control motors include stepper motors and servo motors. Based on rotor structure, motors can be classified into squirrel-cage induction motors and wound-rotor induction motors. Based on operating speed, motors can be classified into high-speed motors, low-speed motors, constant-speed motors, and variable-speed motors.

evg martens electrical component parameters

① Rated operating voltage: refers to the voltage required by the coil for normal relay operation. Depending on the relay model, it can be AC voltage or DC voltage. ② DC resistance: refers to the DC resistance of the relay coil, which can be measured with a multimeter. ③ Pull-in current: refers to the minimum current required for the relay to perform the pull-in action. During normal operation, the supplied current must be slightly greater than the pull-in current to ensure stable relay operation. Generally, the voltage applied to the coil should not exceed the rated operating voltage; otherwise, excessive current may burn out the coil. ④ Release current: refers to the maximum current at which the relay performs the release action. When the current in the pulled-in state decreases to a certain level, the relay returns to the de-energized release state; this current is significantly lower than the pull-in current. ⑤ Contact switching voltage and current: refer to the voltage and current loads permissible for the relay. These determine the magnitude of voltage and current the relay can control. These values must not be exceeded during use; otherwise, relay contacts may be easily damaged.

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