无论哪个公司，双电源都有PC级和CB级的区别，那么什么是PC级，什么是CB极呢?
PC级：能够接通和承载，但不用于分断短路电流的TSE，即无短路保护功能，短路情况下仍转换。
CB级：配备过电流脱扣器的TSE，它的主触头能够接通并用于分断短路电流。通俗的讲，CB级，即主回路开关带有短路、过载保护功能，所以执行元件通常是小型断路器和塑壳断路器。
TSE：指由一个或多个设备构成的电器，该电器用于从一路电源断开负载电路并连接至另外一路电源上。
PC级双电源之间有哪些区别呢?这里主要体现在
1、额定工作电流不同，这里会有所区别，有的公司能做到800A，有的只能做到630A。
2、极数，一般都是3级，4级
3、电器级别不同，专用PC级和派生PC级，专用PC机驱动方式是励磁驱动，而派生PC级驱动方式大多是电机驱动。
4、使用类别：主要用AC-33B和AC-33iB，AC-33B，主要用于电动机负载或包含电动机、电阻负载和30%以下白炽灯负载的混合负载;AC-33iB主要用于系统总负荷包含笼型电动机及阻性负载。
6、控制器的功能不同，最主要的区别在于控制器的功能，例如智能控制器，相应的价格会不同，例如操作方式、安装方式都会不同，对应的转换时间也会不同，这个根据实际需要选择对应的控制器类型。
CB级双电源之间有哪些区别呢?这里主要体现在
1、执行元件：执行元件通常是小型断路器，还是塑壳断路器，对应的额定电流会不同。
2、极数：2极、3极、4极。
3、控制器类别不同，工作方式也会不同，例如：电网-电网，自投自复，自投不自复，互为备用等。
另外，PC级与CB级所做的型式试验也会不同，具体需要根据使用场所来选择是使用PC级还是CB极。
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