以我们常用的C型和D型为例，区别就在于C型表示断路器在10倍及以上额定电流时脱扣，适用于照明系统或者启动冲击电流小的系统，而D型断路器在20倍及以上电流时脱扣，适合于电流冲击大的动力系统中，比如直接启动的小功率电机等。
除了C、D型，还有A、B型，这几种短路器的区别就在于脱扣器的差别，过载保护的作用是相同的。空气开关上D是一种电流的曲线，有两种曲线。
D曲线与C曲线，表示的是开关工作曲线，D曲线和C曲线它们的不同点是D一般用在动力电上，比如有各种大功率，高电压，大电流机器设备，就需要用D曲线空开。D曲线的短路跳闸电流比C曲线的短路跳闸电流要大。C用在照明电上。
小型断路器(空气开关)上标注的C和D的意思是：C代表家庭用负荷开关，D代表动力型如控制电动机用开关。区别是C型开关触头容量较小，过流能力较弱，而D型开关的触头容量较大，过流能力较强。
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