[Mike Betts]

Check the data sheets that come as an appendix to the robot rules.

All circuit breakers (and fuses for that matter) have an "inverse time" curve. They have an extremely small but accurate internal resistance which heats up via the power dissipated in this small resistance (P=I*I*R). The actual trip mechanism is thermal.

Be warned that the internal heat does not dissipate quickly. If you run at 200A for 6 seconds and then try running at 100A, you will trip in a lot less time than the quoted 120 seconds (more like 20-30).

This warning also applies to self resetting 20 and 30A circuit breakers. Once they start tripping, they will re-trip in a very short time at the same amperage.

Lastly, these are not "precision" devices. Variations of +/- 30% are not uncommon. Plan accordingly.

Mike