marathon SL

marathon SL - the powerful garage door operator for maximum convenience

The powerful garage door operator for maximum convenience

The marathon SL is a real workhorse: Our premium model can move doors up to 8 m wide.

Product advantages

Customised combination of products
The strengths of the operator and length of the track can be combined flexibly to customer requirements.

Removable carriage 
The carriage can be easily removed with the new track unit. The track is galvanised and powder-coated and therefore very long-lasting.

Accident prevention through electronically controlled force measurement
The operator learns on its own and runs in the currently most economical way thanks to the DPS (Dynamic Power System). It adapts to the environment and always moves at the same speed. For the operator, obstacles mean that it suddenly needs more force. In this case, it stops or reverses. This prevents injury and damage to property.

Alternatives to the ITA
Since you can also operate industrial gates with the operator, it is also very well-suited for commercial use. It is high-performance and is an economical alternative to the ITA.

Quick and easy installation
No annoying above-head work. Thanks to the conversion set (separate head), installation in underground garages is better and easier.

Optimal application of force through soft running
Efficient application of force guarantees controlled soft running in ramp form which prevents unnecessary power loss.

Connections for photo eye and TorMinal
Since all connections for safety-relevant accessories are already present, no additional control units are necessary.

Environmental and cost efficiency
Consumption of electricity and environmental impact are low thanks to the efficient ring core transformer.



  • Very fast and quiet opening and closing
  • Longer service life and less wear thanks to gentle transmission technology provided by the travelling motor
  • The self-locking motor provides protection against break-in and unauthorised access; no additional locking mechanism is necessary
SOMMER marathon SL operator


  • Galvanised and powder-coated running rails for optimal current flow
  • Very durable
  • For doors up to a height of 3.4 m
  • Expandable with additional rail extension for up to 6000 mm door heights
  • Quick-tensioning chain for fast, secure, and easy installation with standard tools
SOMMER marathon SL track

Motor control unit

  • Offers numerous connection options for photo eyes, safety contact strips or TorMinal, for example
  • Wall switch with integrated 7 m cable
  • Adjustable automatic closing function
  • Integrated radio receiver (FM 868.8 MHz) and lighting
  • Automatic obstacle detection with reversion when an obstacle is encountered, thus providing optimal protection for families with children, for example
  • The DPS (Dynamic Power System) continuously reads in the required force and adapts it to changing external conditions, thus providing the highest level of safety.
  • Backjump feature takes stress off the door and the operator
  • Controlled soft running at the beginning and end of the door movement

The highest level of safety

  • Automatic obstacle detection
  • Break-in protection
  • SLS – Safety Lock System

You can find out more about the safety features of our garage door operators here .

Technical data

Description marathon 550 SL marathon 800 SL marathon 1100 SL
Item no. - - -
marathon SL 4250V000 4570V000 4580V000
Track unit 2,600 mm 1870V000 1870V000 1870V000
Track unit 3,400 mm 1871V000 1871V000 1871V000
Pull force 550 N 800 N 1,100 N
Maximum door width in mm:
Swinging door 5000 6000 8000
Sectional door 5000 6000 8000
Hinged double door 2800 2800 2800
Side-opening sectional door 4000* 6000* 8000*
Max. door height in mm:
Swinging door 2600 2600 2600
Sectional door 2350 2350 2350
Hinged double door 2800 2800 2800
Side-opening sectional door 2500 3000 3500
Up-and-over door 1900 - 2700* 1900 - 2700* 1900 - 2700*
  * With rail extension 

Scope of delivery

Operator unit

  • marathon 550 SL (550 N pull and pushing force) / Item no. 4250V000
  • marathon 800 SL (800 N pull and pushing force) / Item no. 4570V000
  • marathon 1100 SL (1100 N pull and pushing force) / Item no. 4580V000

Matching track unit

(expandable with rail extension)

  • Movement range 2600 mm / Item no. 1870V000
  • Movement range 3400 mm / Item no. 1871V000
  • New: Movement range 2650 mm with removable carriage* / Item no. 1873V000

Every operator unit can be combined with every running rail unit.

*The "removable carriage" version facilitates a fast and simple removal of the carriage when service is necessary. The operator can remain on the ceiling and does not need to be dismounted.

SOMMER marathon SL rail extension