What are the differences between RE17RAMU and RE17RCMU considering the time delay type?

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RE17RAMU >>> time delay type is " A " and " At " , noting that the letter " A " refers to power on-delay relay, and " At " refers to power on-delay relay (summation) with control signal

RE17RCMU >>> time delay type is " C " , noting that the letter " C " refers to off-delay relay with control signal

for further information , kindly check the catalog page attached and data sheet links below:

RE17RAMU
http://eshop.schneider-electric.com/product.aspx?org=21&lang=0&dist=276&prod_id=RE17RAMU

RE17RCMU
http://eshop.schneider-electric.com/product.aspx?org=21&lang=0&dist=276&prod_id=RE17RCMU