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Unread 18-03-2010, 22:29
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Re: CIM Motor Strength

Quote:
Originally Posted by robself705 View Post
One problem with that is that you can only have the jaguar on a 40 amp fuse, nothing larger and only one. We actually tripped our 120 amp at competition this last weekend. Four cims at full power and a vacuum drawing 30 amps from two fisher prices. Unfortunately we didn't listen to the mentor who said "you better put the cims on 30's because you could blow the main breaker and that doesn't reset".....ooopps.
Yesss... but those 40 Amp breakers don't trip at 40 Amps. Take a look at the Data Sheet. 40 amps is the must hold rating. That means that the breaker will never trip at 40 amps. Meanwhile, 135% of rated amperage is the "must trip" level. This means that at 54 amps, the breaker is guaranteed to trip..... eventually. Within the two minutes for sure, even if you get a bad breaker on a cold day. Other trip values are similar. 200% rated amperage gives you a trip time of 1.5 - 3.9 seconds. And faster for ever increasing currents. Interestingly, even at 120 amps (around the max a CIM can pull), you're looking at a trip time of 0.5 - 1.1 seconds. So don't count on that 40 amp breaker to save your bacon.
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