Spring-loaded terminal

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Typical design of a spring-loaded terminal
Different types of spring-loaded terminals

A spring- loaded terminal (also known as a cage clamp , cage clamp or spring- loaded clamp , also called Wagoklemme according to a well-known manufacturer ) is a form of spring clamp . It is used in electrical engineering for the detachable connection or connection of wires , cores and lines .

Function and use

The spring-loaded terminal makes contact with a hard vein (wire) by spring force in a holder profile, which can be easily released by a spring mechanism. The connection is mechanically permanent and electrically safe. It is based on self-locking . For the purpose of making contact, the profiled, curved, highly conductive holder angle to the conductor is designed so that the resulting angle is smaller than the arctangent of the coefficient of static friction of the material pairing . The spring lies flat against the wire.

The connection is released by simultaneously rotating and pulling the hard vein against the direction of insertion.

Spring-loaded terminals can be designed in various designs. They are used, for example, in house installation, in computer and communications technology and in devices.


The spring-loaded terminal is characterized by a connection that can be established quickly and easily while at the same time being easy to detach. The electrical contact is comparable to an insulation displacement contact . The contact is made by inserting the hard vein with relatively little force and can be easily released by pressing on an actuating element with a suitable tool (e.g. screwdriver).

The spring-loaded terminal avoids sources of error that can arise with classic screw connections due to heat generation, vibrations or material flow (e.g. with an aluminum conductor ).


Michael Raspotnig, Puls GmbH (Munich), Application Note AN29.01.de , January 2006, Rev. 1

See also

Individual evidence

  1. Online PDF with illustrations