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3SU14011BB503AA0 electrical component is a current fuse that provides overload protection. When a circuit fault or abnormality occurs, the current continuously rises. This rising current may damage certain important components in the circuit, burn out the circuit, or even cause a fire. If a fuse is correctly installed in the circuit, it will melt and cut off the current when the current abnormally rises to a certain level and temperature, thereby protecting the safe operation of the circuit. With the fuse correctly installed in the circuit, it will melt and cut off the current when the current abnormally rises to a certain level and temperature, protecting the safe operation of the circuit. The fuse invented by Edison was used to protect the then-expensive incandescent lamps. With the development of the times, fuses protect power equipment from damage due to overcurrent and overheating, avoiding serious damage to electronic equipment caused by internal faults.

3SU14011BB503AA0 Electrical Component Functions

(1) often compares sensor functions to the 5 major human sensory organs: photosensitive sensors for vision, acoustic sensors for hearing, gas-sensitive sensors for smell, chemical sensors for taste, and pressure-, temperature-, and fluid-sensitive sensors for touch. (2) Classification of sensitive elements: Physical type, based on physical effects such as force, heat, light, electricity, magnetism, and sound. Chemical type, based on the principles of chemical reactions. Biological type, based on molecular recognition functions such as enzymes, antibodies, and hormones. Usually, they can be divided into ten major categories according to their basic sensing functions: thermosensitive elements, photosensitive elements, gas-sensitive elements, force-sensitive elements, magneto-sensitive elements, humidity-sensitive elements, acoustic-sensitive elements, radiation-sensitive elements, color-sensitive elements, and taste-sensitive elements (some have also classified sensitive elements into 48 categories).

3SU14011BB503AA0 Electrical Component Classification

1. Fuse resistors: Also known as fusible resistors, they serve the dual function of a resistor and a fuse under normal conditions. When a circuit fault causes their power to exceed the rated power, they melt like a fuse, disconnecting the connected circuit. Fuse resistors generally have low resistance values and low power ratings. 7. Sensitive resistors: These refer to resistors whose resistance values are sensitive to certain physical quantities (such as temperature, humidity, light intensity, voltage, mechanical force, and gas concentration). When these physical quantities change, the resistance value of the sensitive resistor changes accordingly, presenting different resistance values. Based on sensitivity to different physical quantities, sensitive resistors can be divided into types such as thermistors, humidity-sensitive resistors, photoresistors, varistors, force-sensitive resistors, magneto-sensitive resistors, and gas-sensitive resistors. The materials used for sensitive resistors are almost all semiconductor materials; such resistors are also called semiconductor resistors. The resistance value of a thermistor changes with temperature; a negative temperature coefficient (NTC) thermistor has a resistance that decreases as temperature rises. NTC thermistors are widely used and can be further divided into general-purpose NTC thermistors, voltage-stabilizing NTC thermistors, and temperature-measuring NTC thermistors. A photoresistor's resistance value changes with the intensity of incident light; when incident light increases, the resistance of the photoresistor decreases, and when incident light weakens, the resistance value increases.

3SU14011BB503AA0 Electrical Component Types

For different application scenarios, the purpose of using varistors varies, and the voltage/current applied to the varistor is not the same, so the requirements for the varistor also differ. Distinguishing these differences is very important for correct usage. According to the purpose of use, varistors can be divided into two main categories: (1) protection varistors and (2) circuit function varistors. Protection resistors: (1) Distinguish whether it is a varistor for power supply protection or for signal line/data line protection, as they must meet different technical standard requirements. (2) Based on the different continuous operating voltages applied to the varistor, varistors across power lines can be divided into AC type and DC type. The aging characteristics of varistors under these two voltage stresses are different. (3) Based on 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. 1. Surge suppression varistors refer 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 the peak current and voltage may be very high. The vast majority of varistors belong to this category. 2. High-power varistors refer 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, the average power is quite high. 5. High-energy varistors refer 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.

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