David Billington fired this volley in
:

What's the benefit of a low voltage contactor and safety circuit? I have
various equipment with safety circuits and they use either the 230V or
415V supply for the contactor and safety circuit.

It's simple, cheap, and easy to rig remote switching and sensors for things
like safety guards. It requires only bell wire and some thoughtful
routing, rather than running live power everywhere a switch is required.

LLoyd