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TPD1E10B06: ESD Discharge Protection - ±30kV or +30kV?

Part Number: TPD1E10B06

The datasheet for this part repeatedly suggests that it is capable of air gap and contact discharge protection up to ±30kV. However, in section 6.2 ("ESD Ratings") on page 3 of the datasheet (, it says 30000 V under contact and air discharge ratings. Immediately above that, next to human body model and charged device model, it specifies "±" next to its ratings.

Is this device rated for ±30kV or just positive 30kV air gap and contact discharge protection? Do I have a fundamental misunderstanding of what these ratings mean?