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Solid State Relays (SSRs) are electronic switching devices that utilize semiconductor technology instead of electromechanical components to control and switch AC and DC loads, such as motor circuits, heating elements, and valves. The CWA48125 SSR is part of Crydom’s family of SSRs utilizing SCR technology, providing high speed switching for a variety of applications.

Application Field

The CWA48125 is commonly used in industrial, commercial and home automation systems as a control device. These systems typically require a precise level of switching and control that the CWA48125 is capable of providing. The CWA48125 is especially well suited for applications in environments with high levels of noise and interference, such as industrial and motor control applications.

The CWA48125 can be used to control various types of motors such as three phase motors, permanent magnet motors, and high power 40 A motors. It is also suitable for controlling lighting, pumps, and other loads that require high power ratings. Additionally, the CWA48125 can be used as a modulator in power measurement devices.

Working Principle

The CWA48125 has a gate turn-on voltage (Vgt) and a gate turn-off voltage (Vgt). When an electric current passes through the gate turn-on voltage of the device, it is turned on. When there is no current passing through the gate turn-off voltage, the SSR is turned off. The CWA48125 also features an output voltage shift, providing precise switching from full load to no load conditions.

To control the current of the CWA48125, a voltage source is connected to the gate-on voltage. This voltage source has a variable voltage adjustment based on the desired current load. When the voltage is increased, the current flow increases, and therefore the load is increased. This adjustable gate voltage allows the operator to precisely control the amount of load on the device.

The CWA48125 also features short-circuit protection and current sense capability. This ensures the device will not be damaged by overloading, protecting the device and any downstream components. In addition to these safety features, the CWA48125 also has a built-in thermal protection that automatically shuts down the device if it becomes too hot and needs to cool down.

Conclusion

In conclusion, the CWA48125 is an ideal choice for industrial and commercial applications that require precise switching and control of AC and DC loads. The CWA48125 has a gate voltage control feature which allows the operator to precisely adjust the current load of the device. Additionally, the CWA48125 features short circuit protection, current sense capability, and a built-in thermal protection for added safety.

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