Opinions vary in warmglass circles about the best sort of relay(s) to use - options are
conventional electromechanical mercury-wetted solid-state
Being a luddite, I rather like 'relays that go clunk' - but what experience do you all have of this kind of kit - and what about the reliability of solid-state switching.
As the controller aims for a specific 'ramp / hold' profile during each firing, the relays may be switched some twenty to fifty times each firing cycle.
There will be another main 'safety' relay - which will be capable of breaking the power to both elements - probably controlled by an independent 'kiln-sitter' - just to prevent 'meltdown' in case the main controller goes out to lunch, or the element relays fail 'closed'.
Suggestions on the best relay technology, please ?