Automatic change over switch circuit and electrical unit

According to the utility model discloses a some aspects disclose an automatic change over switch circuit and electrical unit. Example automatic change -over circuit includes: have line terminal and neutral terminal voltage input end, have line terminal and neutral terminal the 2nd voltage input end, have line output terminal and neutral point output terminal the voltage output end, link the line terminal of voltage input end with the line terminal's of the 2nd voltage input end first relay, link the neutral terminal of voltage input end with the neutral terminal's of the 2nd voltage input endsecond relay, hookup are in the line output terminal with first relay with at least third relay, hookup between in the second relay is in neutral point output terminal with first relay with at least fourth relay between in the second relay, the device also comprises a controlle. 根据本实用新型的些方面，公开了种自动转换开关电路以及电源单元。示例性自动转换开关电路包括：具有线路端子和中性点端子的第电压输入端、具有线路端子和中性点端子的第二电压输入端、具有线路输出端子和中性点输出端子的电压输出端、联接到所述第电压输入端的线路端子和所述第二电压输入端的线路端子的第继电器