Working on the project utilizing magnetic linear actuator. Thinking about safety component. Whatever feedback sensors there are, the decision about safe stop is still on the software side which is known for having bugs no matter how simple the program is there will be a fair chance for it to behave unpredictable with certain combination of factors.

Given that, there is an idea of introducing a mechanical safety link which physically breaks when the load is above normal. I don't have much experience in designing mechanical parts and keen to find out if any of like minded DIYers came up with similar concepts, is this viable, what would the optimal solution look like in your opinion?

And of course the kill switch is a must.

UPD: You people are awesome! Thank you for the brilliant ideas and valuable thoughts, that's exactly what I needed to get out of the box. The shear pin embedded into the telescopic connection option is by far the most appealing being both mechanically simple and providing predictable and repeatable outcome. Lots of testing to be done)