YOKOGAWA ALR121-S50
般来说，国产电流互感器型号字母的含义如下：
第一个字母：L--电流互感器
第二（或三）个字母：A--穿墙式；M--母线型；B--支柱式；绝缘方面，C为瓷绝缘，S为塑料注射绝缘；D--单匝贯穿式；W--户外式；F--复匝式；G--改进型；Y--低压式；Z--浇注绝缘或支柱式；Q--母线型；K--塑料外壳；J--浇注绝缘或加大容量。
第四（或五）个字母：B--保护级；C--差动保护；D--D级；J--加大容量；Q--加强型。连字符后的字母：GH--高海拔地区使用；TH--湿热地区使用。
例1：LAJ-10型电流互感器，变比为400/5、准确度3.0级、容量1.2Ω，参数解释？
L-电流互感器；
A-穿墙式；
J-接地保护或加大容量；
10-用于额定电压10kV；
400/5：一次电流为400A时，二次电流为5A；
3.0级是准确度正负3.0%；
容量1.2Ω，指二次侧串接的设备总电阻，实际上是5A*5A*1.2Ω=30VA.其中，5A为二次侧额定电流。
例2：LM2-0.66型电流互感器是“树脂浇注式电流互感器”
L--电流互感器
M--母线型
2--设计序号
0.66--额定电压为0.6KV
AS12/150b/2S型电流互感器是“环氧树脂全封闭支柱式电流互感器”
它的国内型号为：LZZBJ9-12150b/2S
L—电流互感器
Z—支柱式
Z—浇注绝缘
B—带保护级
J—加大容量
9—设计序号
12—额定电压（12KV）
150b—浇注体宽度为150mm
2S—热稳定电流时间
AS12/175b/2S型电流互感器也是“环氧树脂全封闭支柱式电流互感器”
它的国内型号为：LZZBJ9-12175b/2S
与上面的区别在于它的浇注体宽度变为175mm
LAZBJ-12型电流互感器是“穿墙式全封闭电流互感器”
L—电流互感器
A—穿墙式
Z--浇注绝缘
B—带保护级
J—加大容量
12—额定电压（12KV）
LMZ-0.66Φ22~Φ62是底座安装式圆形电流互感器，具有良好的绝缘性能与防潮性能，二次线接线端带铅封用塑料罩，具备较强的防窃电功能。主要用于过电线和电缆
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