There are many types of switches, for example, there is a push button switch, this switch is normally open long closed how to distinguish?
A, button switch normally open, normally closed how to distinguish
1, can be distinguished by the color of the wiring port, because if it is blue or green, it is normally open contacts. If the presentation is red or pink, is normally closed contacts. Because it has two pairs, on behalf of the normally open and normally closed, so that the two contacts can be touched, to play on or off, to control the switch of the circuit. In order to avoid operational errors, we need to remember that the different colors represent different meanings.
2, if you can not distinguish by color, then generally speaking the upper end is normally closed, the following is normally open, which is also the simplest way, but there is likely to be errors.
3, the more professional method is through the multimeter so as to be able to distinguish, first to adjust to the through file, and then through the two pens are in contact with different contacts, if a beeping sound, it is normally closed point. Conversely, it means that it is normally open point, that is, no.
Second, what is a button switch
1, the button switch it has two contacts, one is a moving contact, there is a static contact, so as to be able to play the role of the switch freely. This structure is actually very simple, in the automatic control of electrical appliances, the need to use a manual signal to control, so it is a low-voltage electrical appliances can automatically reset.
2, this mushroom push button switch is generally used for AC and DC voltage below 440, and the current is relatively small, generally below 45 amps can be used. And in the actual use of the process to prevent misuse, will be distinguished by different markings or different colors. For example, the common colors are red, blue, yellow, white, green, etc. And generally speaking, the presence of red means danger, and green indicates that the connection.
