A padlock has a lock body comprising a housing, furthermore a lock hoop adjustably secured to the lock body, a lock cylinder accommodated in the housing and a latching mechanism accommodated in the housing. The latching mechanism enables a latching of the hoop to the lock body. The latching mechanism releases at least one end of the hoop on an opening actuation of the lock cylinder such that this hoop end can be removed from the lock body. The housing consists of an electrically insulating material at least at the outer side. The hoop and the lock cylinder are electrically insulated from one another by an additional measure.