請問electrical mains要怎麼翻譯呢?

Question

這是電器產品的說明書，全文如下：
Disconnect the appliance from the electrical mains:
It is advisable to contact a qualified technician.
To disconnect the electrical circuit from the mains, after installation proceed as described below:
Fuses
Pull the control button (red) until the centre button (black) comes out
Built-in protections:
(Automatic switch with characteristics type B or C):
move the lever from on to off.
請幫忙翻譯全文，尤其是electrical mains，謝謝。

Answer 1

Disconnect the appliance from the electrical mains:
切斷本電器與電路主**連線:
It is advisable to contact a qualified technician.
建議諮詢合格的技師。
To disconnect the electrical circuit from the mains, after installation proceed as described below:
要切斷此電路與主**連線，於安裝完成後請執行下列程序:
Fuses
保險絲
Pull the control button (red) until the centre button (black) comes out
按下控制鈕 (紅色) 直到中間的按鈕 (黑色) 跳出
Built-in protections:
內建防護:
(Automatic switch with characteristics type B or C):
(具有 Type B 或 C 特性的自動開關):
move the lever from on to off.
將控制桿從開的位置拉到關。

Answer 2

electrical mains 輸電干線