An earthing terminal for mounting on a support rail having a channel section with outwardly turned flanges comprises a yoke of bent sheet metal with a pair of hooks to fit under the flanges, and a metal clamping member with terminals, disposed between respective side parts of the yoke. The yoke has on each side part a lug, the ends of which are bent over to form flanges in which is threaded a clamping screw which contacts the metal member. By means of the clamping screw, the flanges of the suppo...