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The three letters commonly found on compressor terminal blocks are "R," "S," and "T." These letters represent the different phases in a three-phase motor system, with "R" indicating the first phase, "S" the second phase, and "T" the third phase. In single-phase applications, you might see terminals labeled as "L" for line and "N" for neutral instead. Proper connection to these terminals is essential for the correct operation of the compressor.

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