Connection system

Risk of electric shock and damage of device!

Bring the bus terminal system into a safe, powered down state before starting installation, disassembly or wiring of the Bus Terminals!


The Bus Terminal system offers different connection options for optimum adaptation to the respective application:

  • The terminals of KLxxxx and ELxxxx series with standard wiring include electronics and connection level in a single enclosure.
  • The terminals of KSxxxx and ESxxxx series feature a pluggable connection level and enable steady wiring while replacing.
  • The High Density Terminals (HD Terminals) include electronics and connection level in a single enclosure and have advanced packaging density.

Standard wiring

Connection system 1:
Standard wiring

The terminals of KLxxxx and ELxxxx series have been tried and tested for years.
They feature integrated screwless spring force technology for fast and simple assembly.

Pluggable wiring

Connection system 2:
Pluggable wiring

The terminals of KSxxxx and ESxxxx series feature a pluggable connection level.
The assembly and wiring procedure for the KS series is the same as for the KLxxxx and ELxxxx series.
The KS/ES series terminals enable the complete wiring to be removed as a plug connector from the top of the housing for servicing.
The lower section can be removed from the terminal block by pulling the unlocking tab.
Insert the new component and plug in the connector with the wiring. This reduces the installation time and eliminates the risk of wires being mixed up.

The familiar dimensions of the terminal only had to be changed slightly. The new connector adds about 3 mm. The maximum height of the terminal remains unchanged.

A tab for strain relief of the cable simplifies assembly in many applications and prevents tangling of individual connection wires when the connector is removed.

Conductor cross sections between 0.08 mm2 and 2.5 mm2 can continue to be used with the proven spring force technology.

The overview and nomenclature of the product names for KSxxxx and ESxxxx series has been retained as known from KLxxxx and ELxxxx series.

High Density Terminals (HD Terminals)

Connection system 3:
High Density Terminals

The Bus Terminals from these series with 16 connection points are distinguished by a particularly compact design, as the packaging density is twice as large as that of the standard 12 mm Bus Terminals. Massive conductors and conductors with a wire end sleeve can be inserted directly into the spring loaded terminal point without tools.

Wiring HD Terminals

The High Density Terminals of the KLx8xx and ELx8xx series doesn't support steady wiring.

Ultrasonically "bonded" (ultrasonically welded) conductors

Ultrasonically “bonded” conductors

It is also possible to connect the Standard and High Density terminals with ultrasonically “bonded” (ultrasonically welded) conductors. In this case, please note the tables concerning the wire-size width below!


Terminals for standard wiring ELxxxx/KLxxxx and for pluggable wiring ESxxxx/KSxxxx

Connection system 4:
Mounting a cable on a terminal connection

Up to eight connections enable the connection of solid or finely stranded cables to the Bus Terminals. The terminals are implemented in spring force technology. Connect the cables as follows:

  1. Open a spring-loaded terminal by slightly pushing with a screwdriver or a rod into the square opening above the terminal.
  2. The wire can now be inserted into the round terminal opening without any force.
  3. The terminal closes automatically when the pressure is released, holding the wire securely and permanently.

Terminal housing

ELxxxx, KLxxxx

ESxxxx, KSxxxx

Wire size width

0.08 ... 2,5 mm2

0.08 ... 2.5 mm2

Wire stripping length

8 ... 9 mm

9 ... 10 mm

High Density Terminals ELx8xx, KLx8xx (HD)

The conductors of the HD Terminals are connected without tools for single-wire conductors using the direct plug-in technique, i.e. after stripping the wire is simply plugged into the contact point. The cables are released, as usual, using the contact release with the aid of a screwdriver. See the following table for the suitable wire size width.

Terminal housing

High Density Housing

Wire size width (conductors with a wire end sleeve)

0.14 ... 0.75 mm2

Wire size width (single core wires)

0.08 ... 1.5 mm2

Wire size width (fine-wire conductors)

0.25 ... 1.5 mm2

Wire size width (ultrasonically “bonded" conductors)

only 1.5 mm2 (see notice!)

Wire stripping length

8 ... 9 mm



Analog sensors and actors should always be connected with shielded, twisted paired wires.