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45mfd cap
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Topic: 45mfd cap (Read 611 times)
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thedoc298
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Posts: 36
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45mfd cap
«
on:
June 23, 2019, 04:03:31 pm »
Is their any difference between a 45uf 250 volt run cap and a 45uf 250 volt start cap. I know that they are used for different purpose, but I think their should be no difference. Any ideas
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Ian.M
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Re: 45mfd cap
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Reply #1 on:
June 23, 2019, 04:07:25 pm »
A start cap has much higher losses. If you try to use one as a run cap, it *will* go BANG!
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thedoc298
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Re: 45mfd cap
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Reply #2 on:
June 23, 2019, 04:12:35 pm »
how would that be determend on a cap tester
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ArthurDent
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Re: 45mfd cap
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Reply #3 on:
June 23, 2019, 04:14:10 pm »
A motor start cap is a non-polarized capacitor (or 2 caps back-to-back) and designed for very short use time per start. I wouldn't use one for a DC power supply filter or visa versa. Very bad!
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schmitt trigger
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Re: 45mfd cap
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Reply #4 on:
June 23, 2019, 04:23:13 pm »
Start capacitors are almost always clearly labeled as such, because of the risk of running it continuously.
Its ESR is about 10 times that of a run capacitor of the same capacity and voltage.
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thedoc298
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Re: 45mfd cap
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Reply #5 on:
June 23, 2019, 04:29:48 pm »
Thanks, that is something that will show up. The original start did have very high esr. Thanks
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