The difference is the color of housing.
GT17H-4P-2H(55) : Light gray
GT17H-4P-2H(A)(55) : Brawn
GT17H-4P-2H(B)(55) : Green
GT17H-4P-2H(C)(55) : Blue
GT17H-4P-2H(55) : Light gray
GT17H-4P-2H(A)(55) : Brawn
GT17H-4P-2H(B)(55) : Green
GT17H-4P-2H(C)(55) : Blue
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