The difference is the polarizing key.
GT21T-1P-H(55) : Standard
GT21T-1P-H(C)(55) : C-key
Key function is the prevention of mismatches.
Male connector with standard key mates with female connector with standard key not with C-key.
For example, GT21T-1S-HU(55) does not mate with GT21T-1P-H(C)(55).
GT21T-1P-H(55) : Standard
GT21T-1P-H(C)(55) : C-key
Key function is the prevention of mismatches.
Male connector with standard key mates with female connector with standard key not with C-key.
For example, GT21T-1S-HU(55) does not mate with GT21T-1P-H(C)(55).
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