The difference is applicable wire jacket diameter.
AP105-DF13-2630S: 0.65 mm to 1.0 mm.
AP105-DF13-2630S-S: 0.56 mm to 0.65 mm.
Applicable wire gauge size (AWG#) is the same.
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In cases where the application will demand a high level of reliability, such as automotive, please contact a company representative for further information.