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What are the different types of RCD ?

Please note that there're different types of RCD available: 
--TYPE AC to detect alternative earth leakage current this is the most common one. 
-TYPE A they do the same job like the AC type and they also can detect what we call a pulse train current. 
-TYPE B detect only DC earth leakage current. The Type B RCD is not easy to find on the market . 

You can find details about the application of each type in the attached catalog page. 
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