Time relay selection and classification, country hair electrical switch factory, www.jiandq.com
Time relay as a relay in one of the most common types of, in our work and life have a very important role. The principle is based on the input signal for a certain time remaining -" delay", then continue execution input type command, thereby completing the circuit control. Time relay small living appliances, to high technology, such as spacecraft etc, are the traces of. This article will elaborate on the classification and selection of time relay point.
We first introduce the next time relay classification: if only considering the action principle. Time relay can be mainly divided into the following categories: transistor type, such as a JS20 transistor relay; electronic type, such as JSS1 electronic relay; electromagnetic type. General air used most generally, electric and transistor performance better, but the price is relatively high. On the several types of relay specific differences and characteristics, in a later article is discussed in detail, the following introduces some main points of selection.
Generally speaking, choice of time relay, to consider the most important factor is the time delay, delay, delay precision and working condition types. Of course not ignore some basic factors, for example, rated voltage, rated current selection.
Time relay in the corresponding to use category contact rated voltage rated current of Un and In, characterization of the contact of the relay can switch circuit capable of. Relay selection, maximum working voltage for the relay of the rated voltage of Ui. Maximum working current relay should generally be less than the rated thermal current relay. Usually a relay provides several rated working voltage, along with a list of corresponding rated current ( also can list control power ). It also determines the time relay of the entire process. Then use the category selection, such as AC, or dc. The coil switching attention must also be considered. Finally, some specific service conditions. Such as the surrounding environment, temperature, pollution level, altitude, vibration etc.. This involved also is very complex, specific can see corresponding time relay product manual.
To the product, the most important and the most important is to be stable and reliable operation, and can guarantee its accuracy. The above mentioned about the time relay selection is very shallow, the selection of specific time, also needs to be combined with practical, concrete analysis of concrete problems. But the most important is to understand what you really need.