带有外壳的代号为“X”，防护等级为IP23.，通用户外防雨“X2”；户内安全防护“X1”；不带有外壳的则无“X”代号。

   1、电阻F元件代号:

   “B”-ZB1及ZB2—康铜板形电阻器元件；

   J（Y）-ZJ（Y）-铁铬铝齿形（又称大波浪电阻元件）；

   D-ZD1-铁铬铝小波浪电阻元件；

   Ｈ－ZH-不锈钢网状形电阻器元件。

   2、通电持续率TD%：

   TD15%为“1”； TD25%为“2”； TD40%为“4”； TD60%为“6”

   3、控制系统代号：

   T-凸轮控制器控制（不对称电阻）

   K-凸轮控制器控制（不对称电阻，转子一相开路起动）

   Q-用PQR10型即PQD6402型升降控制箱（七段电阻六段切换）

   S-用PQS单相制动型升降控制箱（五段电阻四段切换）

   Sf-用PQS单相制动型升降控制箱（六段电阻五段切换）

   Y-RQY型PQR9型即PQD6401型平移控制箱

   Z-PQZ型抓斗控制箱（四段电阻三段切换）

   Ze-PQZ型抓斗控制箱（五段电阻四段切换）

   F-QR2S二级反接制动升降控制箱

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