We want to know the proper breakers for the KOP motors.
What breaker are correct for a CIM motor, a Fisher Price motor, BaneBot motors, window motors?
use 40AMP breakers with your motors. However if you go too small (20 or 30) you can’t hurt anything…your breakers will just trip too easily.
I would go with 40AMP breakers on the motors. Remember that going too low will cause your breakers to trip easy.
Is that 40A breakers for all four kinds of motors? Don’t the different models need different breakers?
Nope. Read the breaker rules in <R39>.
However, other than the drive, it is advised to start low on the breaker amperage and go up a size if you’re tripping the breakers a lot under normal usage.
Stall current on the Window motors is 18-21A depending on whether it’s left or right so a 20A breaker would be the best choice for that motor. For any BB motor other than the 395, the CIMs, and the FPs a breaker up to 40A would be appropriate depending on your usage.
Please be advised that the breaker choice is not dependent on the load but the wire size you choose to feed the load. Breakers are matched by wire size in the rules. That is the only rule you must follow.
As a general rule, I recommend feeding drive motors, particularly CIM motors with #10 wire and 40 amp breakers, #12 can be used but only on lengths less than a few feet. You can choose your own design of course but a rule of thumb I came up with a few years back is the “wire foot”. This is a rule that relates voltage drop at 100 amps with wire length and size.
Wire Foot(WF)
Equivalent to loss in 1 foot of #10 wire.
At approximate stall current of the three large motors, or about 100 amps, this is equivalent to 0.1volt/wirefoot(WF).
1 ft. of #6 wire = 0.5 WF
1 ft. of #10 wire = 1 WF
1 ft. of # 12 = 1.7 WF
1 ft. of # 14 = 2.5 WF
Battery Internal Resistance = 11 WF
Victor Series Resistance = 6 WF
Jaguar Black=2-3 WF
Bad crimps = 1-3 WF each
Remember, there are two wires in every circuit, positive and negative so add all wire length to your calculation.