L&L has used a lot of different style thermocouples over the years.
With thermocouples there are different TYPES, and within the various types there are different STYLES.
The only way to figure this out accurately is to have a kilowatt meter installed in the power supply line.
The Dura-Fire kilns are designed to have all power turned off by the Kiln Sitter/Time. These have a two-pole contactor that can only shut off single phase power.