Has anyone used these type connectors?

I saw that. But I don't know what all that terminology means. Measured in C means they have to get really hot to melt. I do know that.

Operating Temperature: -67°F-257°F
Fully Recovered Temp: 266°F
Temp of Solder Starting Melt: 257°F
Temp of Full Solder Melt: 302°F
Voltage Resistance: >600V