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promax electrical components are high-power electrical devices, also known as thyristors. They offer advantages such as compact size, high efficiency, and long service life. In automatic control systems, they can serve as high-power drive devices, enabling low-power control elements to manage high-power equipment. They are widely used in AC/DC motor speed control systems, power regulation systems, and servo systems. Thyristors are categorized into unidirectional and bidirectional types. Bidirectional thyristors are also called triacs, abbreviated as TRIAC. Structurally, a bidirectional thyristor is equivalent to two unidirectional thyristors connected in reverse parallel; this type of