微型互感器分为微型电流互感器（含微型电流变换器）和微型电压互感器。是电力行业的设备，一般用于各种电力仪器之中用于测量、保护之用。与普通互感器相比微型互感器具有体积较小（可以做到指甲盖大小），精度较高（普通互感器为0.5、0.5S、0.2、0.2S四个精度等级，微型互感器可以达到0.1级）等特点。
Micro transformers are divided into micro current transformers (including micro current converters) and micro voltage transformers. It is the equipment of electric power industry. It is generally used for measuring and protecting among various electric power instruments. Compared with ordinary transformers, micro-transformers have the characteristics of smaller volume (nail cap size can be achieved), higher accuracy (ordinary transformers are 0.5, 0.5S, 0.2, 0.2S, micro-transformers can reach 0.1 level).
微型电压互感器是一种电流型电压互感器，初级通过电路中串入电阻，二次并联电阻。将电压转换成电流，经互感器作电流变换后，初级输出电流信号经取样电阻转换为所需要的电压。微型电压互感器绝大部分为插在电路板中使用。
Micro-voltage transformer is a current-type voltage transformer, which is composed of series resistance and secondary shunt resistance in the primary circuit. The voltage is converted to current, and the primary output current signal is converted to the required voltage by the sampling resistance after the current is converted by the transformer. Most of the micro voltage transformers are plugged into circuit boards.