klemcontact

Klemkontakt is a term used in German-language technical documentation to describe an electrical contact that is secured by a clamping mechanism, rather than by a soldered or press-fit connection. It typically refers to contacts within terminal blocks, relays, plug-in connectors, and other equipment where a conductor or contact element is held in place by a clamp to establish a low-resistance electrical connection.

Derived from Klemme ("clamp") and Kontakt ("contact"), the term is common in manuals and catalogs and is sometimes used interchangeably with Klemmenanschluss or Klemmenverbindung in German.

Most Klemkontakte are of two main kinds: screw-clamp and spring-clamp. In a screw-clamp design a screw presses a fixed jaw against the conductor; in a spring-clamp design a spring-loaded element holds the conductor with a predetermined force. Both variants specify a conductor size range and a maximum current rating from the manufacturer, and require proper torque or installation to ensure a reliable connection. Materials are typically copper alloys with silver or tin plating to minimize contact resistance and corrosion.

They are widely used in electrical distribution and control systems, including DIN rail terminal blocks, relays, contactors, and other plug-in or modular components in automation equipment.

Clamping connections are designed for vibration resistance and repeat connections, but improper installation or aging can lead to increased contact resistance or loosening. Regular inspection, clean contacts, and adherence to the specified torque and conductor size are recommended.

Related terms include screw terminal and spring clamp terminal; the broader category is electrical connectors and terminal blocks.