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Old 1st Oct 2018, 8:10 am   #12
trsomian
Hexode
 
Join Date: Oct 2010
Location: Box End, Beds. UK.
Posts: 271
Default Re: Help Identifying Capacitor

I want to contradict something stated earlier. "Motor start" capacitors are sometimes reversible electrolytics, which are short term rated only. Motor start&run capacitors are suitable for continuous use; it is the "run" bit that signifies suitable for continuous use. Due to the phase of the current in the auxiliary/start winding of the motor they are frequently of 400V or 450V AC rating for use on 240V supply.

The reversible electrolytics are really fairly ghastly things, leak electrically, (not physically) something terrible hence they overheat if left with power on for very long. Most motors using them are specified for 10 starts an hours or something similar
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