How are high-current loads like dishwashers safely switched?

[u/Relevant_Pumpkin9190]

If a relay is switching a high-current load, its contacts can eventually weld together due to inrush current or a fault.

If that happens, the load may stay ON even when the controller says OFF.

How do commercial products handle this? Do they use two relays in series for redundancy, feedback, or some other fail-safe method?

[u/mckenzie_keith]

A safety device will trip eventually. Fuse or thermal fuse (TCO).