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What is the difference between ME3 (3 phase without neutral KWH meter) and ME4 (3 phase with neutral KWH meter)?

the only difference between the ME3 and ME4 powerlogic meter is that the ME3 is dedicated for 3 phase system only ( 3 poles only)

but the ME4 is suitable for 3 phase system (4 wire ) which means 3 phase + neutral ( 3P +N)

so in conclusion the only difference is the number of poles

kindly find the attached datasheet for the two powelogic meters to check it
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