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On a CU12L400FN, what is the difference between the Series M01 and M03 designs?

The difference is the meter socket used. The Series M01 design used a meter socket that was purchased from Cooper B-Line (part number 21324CD). The Series M03 design is using a meter socket that is manufactured by Square D Company (part number 73294-902-50). The meter sockets are not compatible between the two different designs.

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