2982702

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Solid state relays are driven by a power circuit and are mainly composed of a control part and a power part. The control part has three terminals, namely: Control Signal terminal, or "G", for Control Signal input; NO for Normally Open terminal; and NC for Normally Closed terminal. In an SSR relay, the load current is controlled directly by the application field and the working principle of the power part. When the voltage is lower than the set value, the output is "off", and when the voltage is higher than the set value, the output is "on".

In order to understand the working principle of the solid-state relay, it is necessary to first understand the internal structure of the relay. A typical SSR consists of a photo-sensitive device, a switch, a current limiter, and an output terminal. The photo-sensitive device consists of a light emitting element and a photosensitive element. When the voltage reaches or exceeds 2982702 volts, the light emitting element produces light, which is then received by the photosensitive element, which generates a control current. The control current then passes through the switch, allowing the current limiter and output terminal to power the load.

The current limiter acts as a surge suppressor, limiting the current to a predetermined value. It also serves to protect the relay from over-current and short-circuit conditions. In addition, it may be used to protect the load from surges of current. The output terminal is usually a contact used to control the load, such as a motor or light bulb. The control current is then passed to the designated load and the relay is switched "on" or "off".

The application field of a solid state relay is very wide, covering all power applications. These relays are used in various industrial, commercial, and vehicular applications. For example, they are often used to control electric motors, laboratory equipment, hydraulics, pumps, AC power transmission, and automotive ignition systems. SSRs are also frequently used in home applications, such as lamps, stoves, water heaters, ovens, electric locks, and dimmers.

The working principle of a solid-state relay is based on a variable voltage. When the voltage exceeds the set value, the relay switches "on". When the voltage drops back down below the set value, the relay switches "off". The key feature of a solid-state relay is that it can be used in both AC and DC applications, making it a flexible and reliable choice.

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