CT138

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Solid State Relays (SSRs) allow for electrical switching without the need for physical contact. A CT138 is one type of SSR. It is a low cost three-phase AC-powered switching device that can switch up to 5A current. With a compact design, the CT138 also offers a high level of reliability and long life expectancy.

Applications

The CT138 is suitable for a wide range of applications including electromechanical relays, programmed logic controllers, electric current monitors, motors, VSCs, and other industrial equipment. It is also ideal for applications requiring high speed switching, such as electromechanical relays that operate at frequencies of up to 1MHz.

One of the most common applications of the CT138 is motor switching. It can switch currents with a frequency of up to 250Hz and is suitable for a wide variety of motor loads. It can also be used for controlling PLCs, motor starter circuits, actuators, and more.

The CT138 is also used as an AC current monitor in safety and security systems, and as a switching device for electro-mechanical relays.

Working Principle

The CT138 works on an opto-isolated voltage switching principle. When voltage is applied to the SSR, a light-emitting diode (LED) is used to trigger an opto-isolator, which in turn switches a voltage output to the load. Consequently, the CT138 is able to provide electrical isolation between the input and output, protecting against electrical shocks and allowing for higher speed switching.

The opto-isolator in the CT138 acts as a switch between the power and the load. When voltage is applied to the SSR input, the LED produces light and the opto-isolator switches the voltage output to the load. When voltage is removed, the LED turns off and the opto-isolator switches the voltage output to the load off. This opto-isolating principle provides electrical isolation between the input and output, keeping the load safe from electrical shocks.

The CT138 is also equipped with a thermal cut-out feature. This feature is designed to protect the device from high temperatures resulting from electrical overload, short-circuits, or other similar conditions. If the temperature rises beyond a certain level, the thermal cut-out feature disables the device until the temperature decreases to a safe level.

In addition, the CT138 includes an optional kill switch which can be used to disable the device when needed. This feature can be used to prevent unintended activation of the device and helps to ensure safe operation.

The CT138 is a highly versatile and reliable solid state relay that is suitable for a variety of applications. It is capable of switching up to 5A current with a frequency of up to 250Hz, making it ideal for motor switching and other industrial applications. It also includes an opto-isolator and thermal cut-out feature to provide electrical isolation and ensure safe operation. Overall, the CT138 is an ideal choice for any application requiring efficient and dependable power switching.

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