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Thyristors - SCRs

A silicon control rectifier (SCR), also known as a thyristor, is a type of semiconductor component that allows the flow of electrical current in only one direction after the initial circuit is triggered. SCRs are composed of four layers of alternating N-type and P-type semiconductor materials and are used in various applications such as power control, motor speed control, and surge protection. The T72H103554DN is a three-phase high voltage SCR module with a blocking voltage rating of 1800VRMS.

Application field of T72H103554DN

The T72H103554DN SCR module is designed for the use in heavy starting or rectification applications within the industrial environment. Common applications for which the product is suitable include electric arc furnace, large-scale motors, and induction heating. It can be used as a controller for three-phase rectifiers and adjustable speed drives, as well as a source of power control, phase control, and protection.

Working Principle of T72H103554DN

In its active state, the SCR module is triggered when a low voltage (usually around 0.5 to 1.5 volts) is applied to the gate terminal. Then, the SCR begins to conduct current through the main SCR terminals, allowing power to be switched on or off. When the current is stopped, the SCR is said to be in its blocking state, in which it is unable to pass current. In order to keep the SCR in its conducting state, a predetermined minimum current must be passed through it, usually called the “holding current”. This ensures that the SCR does not switch off when the current stops flowing.

The T72H103554DN works on the same principle, but with a few variations. The main difference is that the SCR module can be created with multiple SCRs connected in series, allowing for a higher voltage rating without significantly increasing the current rating. The module also features several built-in features such as overvoltage protection, undervoltage protection, phase-angle control, and thermal protection.

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