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A relay is an automatic switching device with isolation capabilities, widely used in remote control, telemetry, communication, automation, mechatronics, and power electronics. It plays one of the most critical roles in control systems.
Relays typically have an input section that detects certain variables such as current, voltage, temperature, pressure, speed, or light. They then use an actuator to switch or control the output circuit. In between, there is an intermediate mechanism that processes the input signal and drives the output.
As a control component, relays offer several key functions:
1) **Expand Control Range**: For example, multi-contact relays can switch multiple circuits simultaneously based on different contact configurations when a specific control signal is applied.
2) **Amplify Signals**: Sensitive or intermediate relays can control high-power circuits using only a small amount of input energy.
3) **Signal Integration**: When multiple signals are input into a multi-winding relay, they can be compared and processed to achieve a specific control effect.
4) **Automation and Remote Control**: Relays can be used in conjunction with other electrical devices to create program-controlled circuits for automated operations.
In control systems, the terms "active" and "passive" contacts are commonly used. Active contacts are those that have an external power source connected to one end. When the contact closes, it sends a high-level signal to the system. Passive contacts, on the other hand, do not require an external power supply; instead, the system monitors whether the contact is open or closed to determine if a signal is present.
In simple terms: "Active contacts generate power and provide a signal, while passive contacts do not generate power but still transmit a signal."
Active contacts can generate electricity through electromagnetic induction, arcs, or other means. Even without a full circuit, if the contact is in an environment where induction or loop power can occur, it may still be considered active. For example, in AC contactors, if one set of auxiliary contacts is connected to a high-voltage control loop, the other set may act as an active contact relative to a weaker current loop.
Passive contacts are used to isolate and transmit signals between different control loops. Their protection level and requirements vary depending on the application field, with higher standards being better in more demanding environments.
Today’s relays operate within safe voltage ranges, and unused contacts are typically passive. However, normally open and normally closed contacts should be handled with care.
For example:
(1) An inverter may have a transistor output, which is considered an active contact.
(2) A switch output from the same inverter is referred to as a passive contact.
An active contact, like a transistor output, requires power to function. If the transistor has no power, the contact cannot work. In contrast, a passive contact, such as a switch output, simply turns an external circuit on or off, and the power supplied to that circuit does not affect the contact's operation.
Founded in 2005, Dongguan Yinyin Hardware Products Co., Ltd. specializes in manufacturing a wide range of electrical components, including silver contacts, electrical contacts, double composite silver nails, riveted silver contacts, soldered silver contacts, precision stampings, conductive copper posts, contact screws, electrical screws, DC and AC pins, copper sleeves, hollow needles, semi-hollow needles, four guides, rivets, silver dots, binding posts, AV copper sleeves, 3F07 copper sleeves, 3F05 copper sleeves, 215 copper sleeves, and various products made from silver, copper, iron, aluminum, and non-ferrous metals. Contact Mr. Chen at 13728192869 for more information.
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