KTR Sverige AB Ritarslingan 7 18766 Täby T: 08/625 02 90

KTR-SI type FT, KT and LT

KTR-SI type FT, KT and LT
  • idle rotating torque limiter
  • ratched torque limiter design
  • hardened surfaces
  • maintenance-free
  • accuracy 15%

Product features

  • Overload system up to 8.200 Nm

  • Available in ratchet, synchronous and failsafe design

  • Also available as disconnecting design (load disconnecting)

  • Suitable for mounting customer parts directly

For exact dimensioning torque limiters latest simulation and calculation programmes are available. Therefore let us know many data of your drive. The more precise these data are, the more precise are the results of calculation. Make use of this possibility and discuss with us the application in advance.

KTR-SI type FT, KT and LT
Show specifications

Ratchet design DK

Any engagement after an overload.
After eliminating the overload, the balls automatically engage in the next indentation.

Synchronous design SK

Synchronous engagement after an overload.

After eliminating the overload the rollers automatically engage after a rotation of 360°. Driving and driven side are always placed in the same position to each other. Other degrees of engagement, e. g. 180°, are also possible.

Idle-rotation coupling FR

When achieving the torque set, the coupling rotates. Subject to the idle rotation mechanism driving and driven side remain separated. The resulting flywheel mass may run out in idle state.
After having removed the overload, the coupling reengages. The re-engagement is effected manually or via a device.

Fail-safe design SGR

The fail-safe design is a pure torque measurement without any ratchet operation.

In case of overload a signal is given by the limit switch, producing a mechanical separation of driving and driven side = disengagement is not possible. 

Information about selection of torque limiters

To make sure that the torque limiter does not yet release with torque peaks related to the process, the switching torque of the coupling should exceed the maximum operating torque by at least 30 % (see diagramme).

Torque limiters and overload systems which re-engage automatically should only be used with a reduced speed for higher release torques. Frequent or longer slipping or ratching increases the wear of the torque limiter.

After the torque limiter has disconnected driving and driven side in case of overload, it may take some time before the drive comes to standstill because of a high inertia in the drive train. This may cause higher wear on the torque limiter and the overload system re-engaging automatically. That is why we recommend the use of the overload system KTR-SI as an idle rotation type for drives with big inertias or with higher speeds.

We basically recommend electronic monitoring of the torque limiters in order to protect the drive in case of overload.

We will be pleased to support you with technical questions and with the selection of torque limiters. For that purpose we dispose of the latest simulation and calculation programs. Here the following fact applies: The more detailed the data, the more accurate are the calculation results.