New ABS Elevator Switch
New ABS Elevator Switch From the different divisions of working methods, the insurance resistors are both non-reversible and duplex. The shape of the non-recoverable fuse resistor is very similar to that of a common metal film resistor. When the overload causes the temperature to rise and...
New ABS Elevator Switch
From the different divisions of working methods, the insurance resistors are both non-reversible and duplex.
The shape of the non-recoverable fuse resistor is very similar to that of a common metal film resistor. When the overload causes the temperature to rise and reaches a certain temperature, the isoelectric film layer or the winding wire coated with the fuse is automatically blown to break the circuit. The non-recoverable fuse resistor should be installed on the circuit board for 5~10mm. Once it is blown, first find the cause of the fault, and then replace it with the same fuse. To ensure the normal operation of electronic appliances. Non-replicable domestically produced products, model number RJ90. Its power is 0.25 ~ 3W, the resistance is 0.2 Ω ~ 20kΩ, when the rated power is 9 ~ 25 times. It can be blown in 60 seconds to 1 second.
The double-type fuse resistor is a cylindrical type in which a common resistor is connected in series with a low-melting-point metal and sealed in a casing. One end of the resistor body is welded with a low-melting solder to an elastic metal piece or wire. Once overheated, the solder joint first melts and the sheet metal or wire is disconnected from the resistor. After the fuse is blown, it can be repaired. The reusable domestic product is RX90. The power is 3 to 12 W, the resistance is lΩ to 5.1 kΩ, and the fusing time is from several tens of seconds to several hundred seconds.
Most of the current electronic appliances use non-recoverable fuse resistors. The following focuses on their related knowledge.
Non-recoverable fuse resistors are wire wound, carbon film, metal film type, oxide film type and chemical deposited film type. Among them, the wire wound type fuse resistor has a low resistance and is suitable for working under high current conditions. The four membrane fuse resistors are non-reactive main products. The matrix is a low-melting boro-lead silicate with a small amount of potassium and sodium ions to form a relatively relaxed structure. After it is heated, the whole is extremely easy to fail, achieving safety and protection. Table 1 is the main technical index of the film fuse resistor.
The fuse characteristic is the most important indicator of the fuse resistance. When the actual power consumption of the circuit is several times the rated power, the continuous load is operated for a certain period of time, and the resistance is blown within the specified ambient temperature range.
Insurance resistors are widely used in televisions, stereos, video recorders, and computer monitors. Microcomputer monitors have a low resistance (several ohms to tens of ohms) and a small capacity (1/8 to 1w). They are commonly used in low-voltage, medium-voltage power circuits generated by line scanning. The fuse resistor is mainly used to protect important elements and devices in the TV. The most widely used is to protect the picture tube filament. In large-screen color TVs, it is also used to protect integrated circuits, high-power transistors, and power output and line output circuits.