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Topic: Calculations for snubber circuit (Read 2565 times) previous topic - next topic


Jan 09, 2018, 02:58 am Last Edit: Jan 09, 2018, 02:58 am by Marciokoko
Thanks Tony,

Could you explain how they got 780pF from this:



Have you given any thought about the in rush of the ac circuit running the compressor? The 10 amp contacts may roast or weld together when the 3/4HP motor starts. In the instant that the contacts close the motor current can reach 6 times the running current, until the motor windings are saturated. Find a relay that the contacts are rated for 20 amps, is my suggestion.
Some knowledge can be dangerous


yikes!  Ok I took an AC clamp meter to my lines on the compressor:

white = 29 max
green = 28 max
black = gnd

So yes, 10A is too little.

But that doesnt mean its 57A draw is it?


Jan 12, 2018, 11:00 pm Last Edit: Jan 12, 2018, 11:03 pm by Marciokoko
I just noticed my relays ARE 30A!

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