Over-Temperature trips

Electronic trips are a re-settable alternative to one-shot (wire-melt) heat fuses.  They are more accurate and not subject to premature tripping due to ageing.  They require a thermocouple.  They can share the thermocouple used by the temperature controller or use a duplex thermocouple.  For highest security an independent thermocouple should be used.  Also ideally, the trip should be used to control a secondary (safety) contactor so that they can guard against failure (contacts welding) of the primary kiln contactor.