Insulation displacement terminal

from Wikipedia, the free encyclopedia

The insulation displacement connection is a connection technology in electrical engineering for insulated copper wires .

In communication technology, a special tool , the so-called lay-on tool , is used to individually press the wires of a cable, including insulation, into a so-called cutting terminal. The tool shortens the excess wire end and the insulation of the wire is cut through the sharp contacts in the metal cutting terminal and a gas-tight electrical connection is established. This connection technique works without L öten , S chrauben and A bisolieren , so it is also called soldering, without screws and insulation displacement technology , short for LSA Technology refers. LSA also refers to the LSA quasi-standard which, along with other insulation displacement technologies, has become the most widespread. Another frequently encountered IDC IDC is ( English Insulation Displacement Connector , dt. Insulation displacement connector), the various products in the company is used. The IDC contacts are not isolated and can be assigned twice. The packing density is high and the wire routing is significantly better than with LSA strips. So are z. B. Main distributors of the telephone network operator equipped with IDC strips, as the HVt-71 connection blocks used here can connect a higher number of wires on a comparable area. The disadvantage of IDC technology is the lack of insulation at the connection points. In the 1980s, the GDR developed its own technology, the "slot clamp technology" (SKT), but this was not used to any significant extent.

The insulation displacement technology is less suitable for stranded cables .

In communication technology , insulation displacement technology has been used since the beginning of the 1970s for main distribution boards in switching centers , and since the beginning of the 1980s in line technology and for installation distributors .

Patent applications go back at least to 1963. In 1997, Tridonic Bauelemente GmbH, a manufacturer of electronic ballasts for fluorescent lamps , was granted a European patent for an electrical connection terminal . A terminal is formed from a single piece of sheet metal by punching and bending, which can accommodate two stripped wires in plug-in terminals and two more insulated wires in insulation displacement terminals. The cutting edges of a V-shaped slot can be profiled like a sawtooth in order to achieve good contact at two points on the conductor circumference. The slots can be arranged offset in pairs in the direction of the conductor in order to keep the conductor mechanically stable at two points; a further offset pair of slots can be used to clamp a thinner wire. This patent expired in 2014.

Today, insulation displacement technology with LSA tools is the usual method of connecting network sockets and patch panels , for example in a computer network. With RJ45 connectors, the contact springs are cut into the cables by crimping . TAE sockets are connected with screw contacts or LSA cutting terminals.

  • Can with insulation displacement terminals

  • Can with insulation displacement terminals (rear)

  • Positioning tool

  • Applied wire

  • Pressed-in positioning tool

  • Protruding wire is cut off

  • Finished

  • 20 LSA plus bar for telephone distributors

In the area of ​​internal cabling of electronic devices or assemblies, connectors are often used, which are also connected to the cable using insulation displacement terminals. In this case, the term insulation displacement technology or the English abbreviation IDC is more common. A precisely fitting ribbon cable is inserted into a slot in the connector. Then the slot is pressed together with a special press or pliers , or alternatively with a vice , whereby all wires are contacted at once by insulation displacement connectors. In contrast to LSA technology, the cable is not cut automatically, so that plugs can also be attached in the middle of the cable.

It is known to use plugs according to DIN 41651 in the form of data cables from hard disks built into PCs (with ATA / ATAPI or SCSI technology) or floppy disk drives . Many other connectors, such as D-Sub or Centronics connectors , are also available with insulation displacement technology.

  • Various offset insulation displacement connectors with a pitch (RM) 2.54mm for ribbon cables with a pitch of 1.27mm

  • Double row to see the staggered insulation displacement terminals

  • D-Sub connector DE-9 (male) and DA-15 (female) with insulation displacement terminals

  • IDC terminals connect a 34-pin cable

  • 50-pin ribbon cable with insulation displacement contacts for SCSI

Web links

Commons : IDC terminals  - collection of images, videos, and audio files

Individual evidence

  1. ↑ Patent DE1232232A : Connection device intended for insulated electrical conductors . Filed February 20, 1963, published January 12, 1967, Applicant: Western Electric Co., Inventors: William Pferd, Karl-Heinz Pohl, Daniel Wescoat Tyler.
  2. ↑ Patent DE2814069A1 : Device and method for producing a solder-, screw- and stripping-free contact on a fixed connection element, in particular for telecommunication line technology. Registered on March 30, 1978, published on October 4, 1979, applicant: Krone AG , inventor: Horst Forberg.
  3. ↑ Patent EP637098B1 : Electrical connection terminal . Registered on July 18, 1994, published on October 8, 1997, applicant: Tridonic Bauelemente GmbH, inventor: Carsten Ruchholtz.