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The relay is an automatic switching element with isolation function. It is widely used in remote control, telemetry, communication, automatic control, mechatronics and power electronics. It is one of the most important control components.

The relay generally has an induction mechanism (input part) that can reflect certain input variables (such as current, voltage, power, impedance, frequency, temperature, pressure, speed, light, etc.); it can "pass" and "pass" the controlled circuit. The actuator (output portion) of the "control"; between the input portion and the output portion of the relay, there is also an intermediate mechanism (drive portion) that couples the input amount, functionally processes, and drives the output portion.

As a control element, in summary, the relay has the following effects:

1) Expand the control range: For example, when the multi-contact relay control signal reaches a certain value, it can switch, disconnect, and turn on multiple circuits at the same time according to different forms of the contact group.

2) Amplification: For example, sensitive relays, intermediate relays, etc., with a very small amount of control, can control a very high power circuit.

3) Integrated signal: For example, when a plurality of control signals are input into a multi-winding relay in a prescribed form, the comparison is integrated to achieve a predetermined control effect.

4) Automatic, remote control, monitoring: For example, the relay on the automatic device together with other electrical appliances can form a program control circuit for automatic operation.

This should be a term commonly used in automatic control systems. In general, active contacts refer to an external power supply connected to one end of the contact. When the contact is closed, a high level signal is input to the system. The passive contact is not. An external power supply is required, and the system monitors the on/off status of the contacts to determine if there is an input signal.
That is, "active has output power, signal is given; passive is no output power, signal is given"
Active: It is electric. It can generate electricity. It is not only the power supply, induction, and the source is not good. Electromagnetic induction can generate electricity, arc, etc. Therefore, if there is no circuit, as long as the contact is In the above environment, it is easy to generate induction or loop power, which are active contacts.
In the case of the same voltage and the same phase polarity, it is completely different from the different phase and polarity phase loops.
For example, the old AC contactor (CJ1) is a pair of auxiliary normally open and normally closed. When one of the groups is connected to the high-voltage control loop, the other group may have a problem with the weak current, because the arc cannot be isolated. There is no wiring, but it is also an active contact relative to the weak current loop; if it is connected to the same voltage level and the same loop, the unused one is passive. This problem is common in 380V, 220V, 24V control loops. .
Another example is that in the case of flammable gas, even if the contacts are isolated, the insulation is not enough, and it is easy to discharge. The ground forms a loop. Even if there is no wiring, it is not a passive contact.
Passive contacts are the contacts that isolate and transmit and control signals in different control loops. The protection level and requirements are different in different fields. Of course, the higher the better, the environment.
Today's relays are within the safe voltage range of their insulation, and the unused contacts are mostly passive contacts. However, the pair of normally open and normally closed should be careful.
2. I have an example:
(1) There are switching outputs on the inverter, one is the transistor output, we call it the active contact;
(2) There is a switch output on the inverter, and the other is the switch contact output. We call it a passive contact;
3, active contacts, such as transistor output, if the transistor has no power, this switch can not work;
4. A passive contact, such as a switch contact output, which only turns the external circuit on or off, and the power supply to this circuit does not affect the closing and opening of the contact.

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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