A terminal clamp including a contact cage including a cage ceiling, two cage side walls respectively adjoining the cage ceiling at a respective side and a cage floor, wherein the cage ceiling, the cage floor and the cage side walls form a portion of a cage jacket; a spring element which forms a clamping device together with a reaction bearing formed by the cage ceiling, the clamping device configured to support and electrically contact an electrical conductor; a conductor insertion opening arranged at a face of the contact cage upstream of the clamping device in a conductor insertion direction x; a cage jacket cutout in the cage jacket configured to provide access to the spring element for an opening tool configured to adjust a position of the spring element relative to the reaction bearing and to open the clamping device.