Mechanical Overload Switch

SM4067, SM4068

The mechanical overload switch is also known as the crane limit switch or the hoist limit switch.

The crane limit switch / the hoist limit switch:

  • Designed for load limitation of hoisting devices and cranes.
  • Very compact size provides a minimal lifting height reduction.
  • Universal "one size" makes it easy to use and adjust to fit different wire sizes and capacities.
  • Can be used for high and low weights, so you know when the upper and lower limit are reached.  
  • Linear force development gives a user-friendly reaction pattern, since you do not have to offload the weight when the limit is reached.
  • Very easy to prepare, install, use and adjust with simple tools.
  • Designed and manufactured in DK for high quality assurance.
  • Available ex. stock (DK).

 

Mecanical Overload Switch

How to find the right product:

  1. Find the lifting capacity.
  2. Find the amount of reevings. 
  3. Divide the lifting capacity with the amount of reevings.
  4. Find the wire size.
  5. Decide if you want 1 or 2 cut of points.

Example:

  1. The crane has a lifting capacity of 20 tons.
  2. The amount of reevings is 4.
  3. 20 tons divided by 4 equals 5 tons. 
  4. The wire size is 10 mm.
  5. One cut of point is required.

 

The required product is SM4067-6 and can be found in the chart below.

 

Please contact us if you cannot find a suitable product for your application, because we might be able to find a solution for you.

Specifications:
Application areas:Load limitation of hoisting devices, cranes and overhead cranes.
Suitable for a variety of industrial environments, including high-temperature and dusty environments.
Dimensions:W70 x H145 x L150. The compact size provides a minimal lifting height reduction.
Materials:Housing: Nickel plated steel.
Springs: Heat trated spring steel, according to GB/T 13304.
Axles: CK45.
Hysteresis:Max 4% FS.
Installation:Mounted on the dead end of the wire rope. Quick and precise installationon with simple tools. An opening to the spring makes it possible to see when the switch is adjusted correctly.
Datasheet:pdf-download-150x150

Item No:Wire rope:Capacity:Switch:Weight:
Cut off points:1 adjustable
SM4067-26-13 mm500-1500 kg. per reeving.12.45 kg.
SM4067-46-13 mm1500-3000 kg. per reeving.12.80 kg.
SM4067-66-13 mm3000-5000 kg. per reeving.13.15 kg.
SM4068-213-20 mm500-1500 kg. per reeving.12.45 kg.
SM4068-413-20 mm1500-3000 kg. per reeving.12.80 kg.
SM4068-613-20 mm3000-5000 kg. per reeving.13.15 kg.
Cut off points:2 individual
SM4067-2D6-13 mm500-1500 kg. per reeving.22.45 kg.
SM4067-4D6-13 mm1500-3000 kg. per reeving.22.80 kg.
SM4067-6D6-13 mm3000-5000 kg. per reeving.23.15 kg.
SM4068-2D13-20 mm500-1500 kg. per reeving.22.45 kg.
SM4068-4D13-20 mm1500-3000 kg. per reeving.22.80 kg.
SM4068-6D13-20 mm3000-5000 kg. per reeving.23.15 kg.

Preparation

Installation

In use

Adjustment