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Unread 10-01-2002, 10:30
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Mike Betts Mike Betts is offline
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Join Date: Dec 2001
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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
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Mike Betts

Alumnus, Team 3518, Panthrobots, 2011
Alumnus, Team 177, Bobcat Robotics, 1995 - 2010
LRI, Connecticut Regional, 2007-2010
LRI, WPI Regional, 2009 - 2010
RI, South Florida Regional, 2012 - 2013

As easy as 355/113...
 


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