Just to give some more background: We are using a Ameritherm Induction Heater
Power: 3 kW
Model: Nova Star 3L
Frequency: 50-485 kHz
AC kVA: 4.5
VAC Line Input: 3-phase, 220-240
Input Circuit
Breaker: 15 A
When I say it fails, what I mean is that only half (or less) of the solder melts...