In the industrial heating applications, extensive use of SCR or solid state relays as the power control components, power control in two ways: One is the shift of the trigger surge, and the other is a trigger for power, shift Because of the way to trigger a massive surge of high harmonics, power grids pollution, use is restricted. Therefore, in industrial electric heating devices are used to trigger a zero-power, high harmonics can be removed to improve equipment operating power factor. The company independent research and development of intelligent ST-2, HX-2 is based on zero trigger, size is 96 X96 international instrument cases.

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