evg martens electrical components Germany evg martens models evg martens prices

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 in the electrical output circuit. They establish an 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 effectively function as "automatic switches" that use small currents to control large currents. Therefore, they perform functions such as automatic regulation, safety protection, and circuit switching in electrical circuits. A relay is an electrical control device that, when subjected to a specified input for a sufficient duration, causes a predetermined step change in the controlled quantity in the electrical output circuit. When the input quantity decreases to a certain level and remains there for a sufficient duration, the relay returns to its initial state.

evg martens electrical component classification

For different application scenarios, the purpose of using varistors varies, and the voltage/current stress applied to the varistor differs; therefore, the requirements for varistors also differ. Distinguishing these differences is crucial for correct usage. Based on the intended purpose, varistors can be categorized into two main types: protection varistors and circuit-function varistors. ① Protection varistors: 1 Differentiate between varistors for power supply protection 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 types or DC types. 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 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 overvoltages and switching overvoltages. The occurrence of such transient overvoltages is random and non-periodic, and the peak current and voltage may be very high. The vast majority of varistors belong to this category. ③ High-power type: Refers to varistors used to absorb periodic continuous pulse groups, such as varistors connected in parallel with switched-mode power supply converters. Here, impulse voltages occur periodically with a known period, and the energy value can generally be calculated. Although the voltage peak 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 these 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 the loads of certain current transformers.

evg martens electrical component classification

Based on the working power supply of the motor, motors can be divided 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 operating 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, single-phase asynchronous motors, and shaded-pole asynchronous motors. AC commutator motors include single-phase series-wound motors, universal AC/DC motors, and repulsion motors. According to starting and running methods, motors can be classified into capacitor-start single-phase asynchronous motors, capacitor-run single-phase asynchronous motors, capacitor-start-and-run single-phase asynchronous motors, and split-phase single-phase asynchronous motors. According to application, motors can be divided into drive motors and control motors. Drive motors include motors for power tools, motors for household appliances, and motors for other general small mechanical equipment. Control motors include stepper motors and servo motors. According to rotor structure, motors can be divided into squirrel-cage induction motors and wound-rotor induction motors. According to 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 the relay to operate normally. Depending on the relay model, this 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 released state. This current is significantly lower than the pull-in current. ⑤ Contact switching voltage and current: Refers to the voltage and current that the relay contacts are allowed to carry. This determines the magnitude of voltage and current the relay can control. These values must not be exceeded during use, as doing so can easily damage the relay contacts.

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