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The maximum value of the contact current that can be switched. When used, you must never exceed this value.
The relay contact fault is the core of the relay failure. When the actual switching load voltage of the contact is less than the arcing voltage, the current is less than 1A, especially at medium current (test standard is DC 28V, 0.1A), low level (10 ～30mV, l0～50μA) or dry circuit (refers to the relay contact is closed first, then the millivolt microampere load is turned on), the failure mechanism and failure mode of the contact actually work are completely different from the actual switching rated power load. . It is precisely to meet the different requirements of different loads, different products in the design, manufacturing process, testing, testing requirements are also different. Therefore, when actually selecting a relay product, it must not be mistaken to believe that the relay's contact switch is suitable for all loads from zero to the specified rating, and it is not considered that the actual load through the contact is higher than the rated load specified by the product standard. The more reliable the small. For example, it is possible to reliably switch the contacts of 220V and 10A loads, and it is not always possible to reliably switch the actual load of 10mA, and it is not possible to switch to low level or dry circuit load. Therefore, for medium current, low level, dry circuit load, it is recommended to use a metal cover full sealing product with excellent contact reliability.
Generally, in reliability design, derating design is the most effective measure to improve reliability. For other components, if other factors, such as cost and volume, are not considered, the more derating, the higher the reliability. However, the relay differs from other components in that the load stress applied by the contact is less reliable and reliable, which is mainly determined by the contact failure mechanism. When the contact current is used to 100 mA, the arc effect of the contact is significantly weakened, and the carbonaceous material deposited by the contact under high temperature conditions cannot be burned by the arc and deposited on the contact surface, so that the contact contact resistance increases. Affects contact reliability.
When the contact load is used below 10 mA or below 50 mV, the contact reliability is significantly reduced because the voltage cannot break through the film resistance of the contact surface and a low level failure occurs. Especially under high temperature conditions, the oxidation of the contacts is accelerated, and the low-level failure is more serious. Therefore, a load of 10 mA or more and 50 mV or less is called a low-level load.
Although the load stress of the relay should not be too small, the load stress given by the technical conditions is the maximum rating of the contact and is a parameter that should not be exceeded under any circumstances. If it is exceeded in use, the lighter life can be shortened, the reliability is reduced, and the focus can burn the contacts and cause failure.
This is mainly caused by the arcing caused by the relay contacts working under a large load, causing the contacts to be melted, forming irregularities on the surface of the contacts, forming a mechanical bite that cannot be separated, and the larger the contact load, the larger the arcing. The greater the likelihood that the contacts will be burned out. From the above analysis, the appropriate derating is still an effective measure to improve the reliability of the relay. For the correct use of the contact load, under normal circumstances, the load should be designed to be more than 100 mA, and the technical index is more than 80% of the rated load value. It is worth noting that the rated load value of the relay contact is given under resistive load conditions. When the load used is inductive, capacitive and lamp load, it can generate 10 times of surge current, so if it is not blocked Sexual load, generally should be converted when used.
Founded in 2005, Dongguan Yinyin Hardware Products Co., Ltd. specializes in: silver contacts, electrical contacts, double composite silver nails, riveted silver contacts, soldered silver contacts, various precision stampings, conductive copper posts, contacts Screws, electrical screws, DC, AC pins, copper sleeves, such as hollow needles, semi-hollow needles, four guides, rivets, silver dots, binding posts, AV copper sleeves, 3F07 copper sleeves, 3F05 copper sleeves, 215 copper sleeves Etc., and the production of various silver, copper, iron, aluminum, non-show steel and other heterosexual products, electricity, mobile phone 13728192869, Mr. Chen
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