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其内部开关元件采用电子开关，无机械触点。
The switches are electronic switches with no mechanical contact.
负荷电流由调节器通过半导体开关元件直接控制。
The load current is handled directly by the controller through semiconductor switching devices .
并采用固态继电器SSR作为加热器的开关元件。
Adopted solid state relay (SSR) as the heater's switching component.
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