Contactors:
it clearly states that, and is part of the design, for good reasons.
although, real contactors (with contacts) are non polar, at the contacts (basics on low current parts),
electrons do flow and with them, the metal moves (migrates), with them. minus to plus. and some makers (and above)
of some DC contacts, are engineered for some to be more robust contacts, on the minus terminal.
There are issues with switching hot and plasma effects. (the mag, blow off arc, deal)
This would, show up and "recommended Plus side here" as per above....
when designing with parts is best to read the product applications guides, to see their methods.
Nothing beats an example, for sure.
the contacts are 0 ohm. (metal to metal) (milli-ohm rated)
IGBT is a silicon transistor and a totally different product, and design, not in the least simular.
this device , has a parameter called Vce (sat) this is voltage drop, and at a specific current can be expressed in ohms, using R= E/I .
this Drop , makes big time heat. at large currents P = I squared, times R
if talking about real IGBTs please state , the make and part number, there are 100s . we can discuss each parameter.
Crimps. (huge) (small can be soldered easy, large takes , huge irons)
and tools, if using and crimping high connectors, they do make a tool (cheaper) that uses a hammer.
it's a set if dies, and you hit it,. (for the high current battery feed connections)
state the exact pn. of connector, make and /pn. so we can do proper research on that.
AMPSseal. (the real tool is $400 or more, )
but there are these
S & G Tool Aid 18920 Ratcheting Terminal Crimping Kit- 5 Piece - Amazon.com
i just hand soldered 25 ampseal conn's, last night, 770,series, i'ts tedious but finished the job, not waiting a week for mail. etc.
igbt, at random
200amp the ,6 pack.
http://www.infineon.com/dgdl/ds_fs20...335963ee7908dd
the VCE sat is about 2 volts, this equates to about 2v at 200 amps or about 0.1 ohms
but the power dissipated in that 2v drop is 400 watts, so needs cooling, at that current. or it may overheat.
heat sinking is a more complex topic, for sure.
good luck to you
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