The datasheet for the product line contains a table of ordering numbers )(part numbers) for variations of the product with different options for rated current, front or rear mount, locking feature, etc. Models with the locking features will be indicated by a mark in the “v-lock” column.
P/N 486-6251-ND is mfr P/N 5707.0613.312, which without a suffix following would not have a locking feature, per the above datasheet excerpt.
The part numbers in this product series that include a locking feature for which DK has listings are found here. There appears to be a number of errors in our parametric listings regarding the presence or absence of this feature, for which a correction notice has been sent.