Start Capacitors & Run Capacitors for Electric Motors - Differences Explained by TEMCo

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What's the difference between a start capacitor and a run capacitor? Can you use them interchangeably? See why these two types of capacitors cannot always be substituted for one another.
Learn about bleed down resistors here: • Start Capacitor Bleed ...
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TEMCo offers many related products including: Soft Starters, Motor
Starters, Electric Motors, Phase Converters, and more.
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[@ledbetterjack]

This is one of the best UTube videos I've seen. You explained the capacitors & their uses very well PLUS you blew one up for everybody to see how they fail. Yeah

[@MrAmeer49]

Sorry talk very fast with no clear , enough text for explanation

[@dhidhi1000]

and it's an ad

[@frederickasilvera3913]

@@dhidhi1000 uyi

[@3melendr]

Very well done! All tutorials should be this easy to understand. I have absolutely no doubt now how to identify a running or start capacitor or how they shouldn't be used. Thank you!

[@nomercadies]

"IF" the clock on the back wall was accurate, you did this in one take. Until you started blowing stuff up, you just kept rolling without a bleep or hiccup. Sometimes people aren't just watching what you do, but how you get it done as well. Very good on both counts. Congratulations.

[@butchp1000]

I can’t tell you how many capacitor videos I’ve watched. This video gave it to you in layman‘s terms it shows you a start capacitor had to run capacitor and how they work. Very good.

[@VerifyVeracity]

Great video but one thing to note.... When recording the video I think you had the sound levels volume to high for your microphone., that is why the volume is kind of popping up on a lot of you words. thanks.

[@TEMCoIndustrial]

Thanks for the feedback - we'll definitely keep the audio quality in mind for future videos.

[@democracyforall]

Why DC motors does not need these kind of capacitors???

[@JoeSmith-is5fo]

Excellent! Just what I needed to keep from blowing myself up. Got the new "start" cap installed and motor running.

[@stuartsjalund6912]

Your video on differences between run and start capacitors is very good. What you did not mention is the larger capacitance will deliver a certain current for a LONGER (time) as required. One can obtain the same current level with a small capacitance but the time constant is much shorter, and this will not work! In reality, current delivered by a capacitor is determined by I=V/R. Remember there is a time constant! For example a voltage of 100 volts across a capacitor with a 1 ohm resistor across capacitor will deliver 100 amperes (time constant not taken into account,) Capacitors can more or less be inspected on performance by using an ohm meter on the megohm scale, across a discharged capacitor. Reading should be in the megohm or higher, Basically an open circuit. For quality, apply the operating DC voltage across the cap. to charge. Then install a DC Ma meter to view current flow into the capacitor. This determines the number of DC ohms of this capacitor, ( ohms =V/I ) and shows the power factor. The higher the Ma flow into this capacitor, the worse this capacitor is or is rising to 1, power factor. Power factor is PF = R/Z. It should be 0, or almost no current flow indicates a good capacitor! (R is extremely high.). FYI, there should be no heat detected at any time. To increase capacitor life, add parallel capacitors at the same voltage but adding to required capacitance only , not over. For example a 100 uf cap. can be split twice of 2 x 50 uf or more. Splitting the current demanded by the motor capacitor is always easier on a cap. when multi units are in parallel, and this results in added capacitor life! You might need hundreds of amperes for starting and the small R of the capacitor adds up when delivering lots of amperes, resulting in heat in the capacitor, a no, no.

[@takethe101totarzana4]

Excellent demonstration. Good info on the differences.

[@jonnymiskatonic]

I have an older AC motor that is 240v and runs two capacitors. I went to fire it up and one of the capacitors smoked up. The other one was entirely cool and I noticed it doesn't seem to have any juice in it. The smokey one was spraying heck all over the place. My suspicion was that one capacitor went bad and it wasn't able to get up to speed and thus the centrifugal switches weren't able to kick in and it smoked the other one. Does that make sense or am I completely off the mark. Also for replacing these would I need 120v capacitors since it's one capacitor on each 120v circuit or would I need two 240v capacitors? Mine also don't have the bleed down resistor on them, not sure if that's necessary for the newer ones or not. It's an old saw from the 20s but the motor is definitely newer. Stumbled across these videos from your ebay auctions. Figured I'd see what you guys have to say on it.

[@rolfvanderbijl]

Compact and clear yet propper information to get going with, great video which helped me forward

[@dtinman1199]

you have provided me knowledge and one day I will reciprocate by buyimg parts from you. that is how the world should be.

[@TEMCoIndustrial]

Some capacitors are 1000+ mfd, though many have low capacitance ranges as well. In your case, you could easily use a run cap in place of a start cap. Some capacitors are built with a "Pressure Sensitive Interrupter" design that causes them to fail before internal pressures can cause serious injury. The one we showed is designed so that the top of the capacitor expands and breaks internal wiring.

[@jayhiz3514]

Best explanation ive watchd out of 25 vids. Thank u

[@exoticillusions3924]

Great Video!!! thanks for explaining the two different types. I know nothing about them. Installed a start capacitor in a run setup by mistake and it blew up right away hahaha. Now I know that it needs a run capacitor to work. Thanks again, saved me from buying a new motor for the bandsaw

[@MRM-wp4gr]

Is it a good idea to install a start capacitor if compressor run capacitor keeps blowing? Could this keep the unit working for a while until it can be replaced?

[@danilomoreno2323]

Thank for the info sir.how much is prize of running capacitor?

[@MrGarcon98]

i took hvac class about 8 years ago ,,,thanks for your video ,interesting . love to learn

[@bobbebacon2516]

Great work if you have any more heating or air conditioning tips I like to see them very knowledgeable

[@teslapark3406]

I wanted to know the power supply voltage you were using we understood it was AC but is that a 120 plug that you hooks to the capacitors directly I want to know it's capability can you put a wall outlet directly to one of those running capacitors?

[@barringtonreid7382]

Okay tell me a bote the run capacitor. How you know the size of capacitor to use on your 3phase motor?

[@MattsShop]

You are very well spoken, thanks for the vid!

[@alexbobawesomeness]

Matt's Shop was

[@MattsShop]

Alex Bob Network Are you not still well spoken?

[@pjwoo276]

You said a capacitor should be about 1.5 times the supplied voltage. I had a pump that ran on 120 volts but the capacitor said 300VAC. Does the hp of the motor matter for the necessary VAC ? There are no markings on it but I think this motor is around 1/2 hp. Question 1) Was that capacitor VAC bigger than necessary ? (1.5 x 120v = 180) I messed up and let it run after it pumped out all the water. Once I unplugged it, it would no longer start or run unless I spun the impeller by hand, then it worked fine. Question 2) Can you clarify and explain to me if it was a start or a run capacitor, or combination ? It says only 8 micro farads, so I guess maybe that makes it a run capacitor. So then I guess sometimes a run capacitor is all that's needed to get the motor 'to start' ???? Because...why ?

[@mrbissi9377]

Great video. If the centrifugal switch is not releasing would this cause for the motor to draw higher current. My motor runs approximately 3amp without load and about 4-6 amp with load. I have found when the switch is not opening the current jumps to 22amps. The problem was a dead capacitor which I feel was the cause from the centrifugal switch not releasing when motor on. I find that the switch only doesn't release when the load is on the motor soon as I put some load after turning the motor on and off eventually the switch doesn’t release and the current jumps higher. The switch looks clean and no damage. Any help to diagnose is appreciated. Cheers

[@TEMCoIndustrial]

The switch should open just before the motor reaches full speed. Off the top of my head, here are a few common causes: Loose connection. Voltage falling off from undersized or too long supply cables. Bad motor bearings causing increased startup drag. Soot at the point of contact on the switch contacts (look for a small black spot) if yes, clean with file or sandpaper.

[@yachtwork]

Just what I needed at this moment. Thanks for taking the time to share.

[@frankmontez6853]

Both original and replacement run capacitor are same 12.5 MFD 440/370 VAC but new replaced blower motor has 7.5 MFD listed . Still good ? Seems fine , it working

[@tonykourounblis1854]

Do you have to change capacitors with exactly the same one or is similar or close capacity ok

[@julieespanol6126]

Good day, Sir can Í asked the correct value of capacitor for 10hp motor 3 phase that can run single phase 220vac. Thank you Sir

[@markpeterson1335]

How do you know what size compasotor to replace the compasotors with if there's no label or writing on the old compasotors and there's 3 compasotors on this air compressor and how do I find out what one is the start and run on this compressor?

[@thebeekeepersworkshop]

A great tutorial easy to understand and concise. Thank you.

[@vidal6992]

Thank u for the info sir, this is exactly what I need to know for testing a start capacitor.

[@MartiA1973]

An educational promotion; don't see that very often in youtube land - well done :)

[@Duckyistrippin]

Awesome video! Thanks alot for taking the time to make this! Funny the background behind you, because this is exactly the info i needed to complete my RPC and get my shop back online!! Thanks again! Awesome!

[@jvargas454]

My AC went out. My intent was to do the electrical checks, but it started out with a dead mouse on top of the capacitor. I cleaned all the debris, then did the checks for the compressor which was fine as was the relay and controller voltage, leaving the capacitor. I couldn't find any shorts on the capacitor but it is the last item to prove out. It did have a bulge on the top. So I ordered it. I get it tomorrow. Question: was it the mouse that may have cause the capacitor to fail?

[@MYNICEEV]

I'm impressed and I don't know anything. I am experimenting with running an AC 230volt washing machine motor on DC 12volts and upwards. I am pleased with the results. However I need more start torque. Can I achieve this with capacitors and if so how do I go about it. Many thanks for the video. I learnt something I did not know today.

[@neutrodyne]

Good Video. Very well done. In your demonstration are you just throwing raw AC power across the caps with out any type of a buffer in the circuit? Thanks.

[@jpscreations6330]

Very informative, kind of a shame the audio is bad quality. Gotta watch those clip levels.

[@Cp6uja]

Great video! One question: You mentioned that run capacitors have a 100% duty cycle so they can remain in the circuit. I want to use these capacitors for a pf correction project on an induction motor, but as my pf will be changing, i need to provide nearly constant switching in which the caps are introduced and taken out of the circuit. Is this safe to do for run caps, or should i use a different type of capacitor? Thank you in advance!

[@TheMarbo74]

Great video! What ohm and power is the discharge resistor you used?

[@mandarkulkarni9999]

Tip ... never use headphones 🎧 in full volume for this video specially starting.

[@valveman12]

Hi and thank you for your help. I was going to take the motor apart but thought an easier test. I snipped off one of the cap wires then turned on the small band saw. The motor just hummed so I quickly turned the motor but it would not start. I then reconnected the cap, turned the motor on and it ran. While it was running, I removed the jumper from the cap and the motor slowed down a bit. So I think this is a run cap. Have I diagnosed this correctly? Thank you.

[@buddha65281]

can't find your FB page. would like to talk to someone in regards to start/run capacitors for my dumb air compressor. very nice video.. learned alot.

[@TEMCoIndustrial]

Hey buddha65281, thanks for reaching out! You can give us a call 6AM - 6pm PST MON - FRI. You can find the number at the end frame of video.

[@robhawkins2492]

Great Video. Simple and concise.

[@quintriggins6557]

Are common and run terminals on single run capacitor interchangeable since there are no markings?

[@236vic]

Hi will a microwave capacitor 1.1uf 2100vac 50/60hz can be charged by 12 volt battery ? Can it be used to between the battery bank and inverter to not let the battery bank take the brunt of electric initial draw. Saving battery. ?

[@TEMCoIndustrial]

Thank you for watching! Glad you found it useful.

[@solarsynapse]

How do I find what value start capacitor to use to replace an unmarked one? The motor is 230vac, 12A, 2hp, 1ph. I can not find any info for the 40 year old motor.

[@kka10001]

Thats all good, but how to identify a run verses start cap. Say you have and you don't know where it came from, how do you tell if it is a run or a start by just looking at the cap.

[@juliolopes2892]

This is a great video. I have a question about capacitors in parallel, specifically for a well pump. I have not opened my control box yet to see if my well pump controller uses a start capacitor or a run capacitor. Is there any danger in paralleling that capacitor (provided it is the same type) ? I’m in the northeast and we recently had a tornado that left us without power for a week, my generator was struggling with the peak inrush current for our well pump when there were other loads drawing on it at the same time. I wanted to see if I could alleviate some of that stress with an additional capacitor. Any knowledge you have to offer on this would be appreciated. Thanks in advance.

[@gatz271]

Is the voltage spec on a Start (or Run) cap an absolute value? In other words, will a 250v rated cap work ok in a 110v circuit, given the µF is correct ?

[@benkanobe7500]

If this is the wrong place/channel for this question, I apologize upfront for not being technical in this area. I have a situation I need help with involving Start-Up and/or Run Capacitor(s). I think..... Situation: When my 6,500 Watt (peak) house back up generator is used to power my home in power outages, my A/C will start slowly and run as the generator slows way down, but the generator recovers after the A/C fully starts up (pump and fans). The A/C will run powered by the generator for whatever time is required for the thermostat setting. The rest of the house circuits can be turned on (Frig, lights, .....) while the A/C is running and all is well and the generator does not sound overloaded or toggle its breaker off. However, once the A/C turns off when the set temperature is achieved, it will not cycle back on without the generator throwing its main 220VAC breaker which shuts everything down. Then, with ALL circuits to the house off (except A/C), and the generator breaker reset, the generator will struggle to restart the A/C and most of the time will throw the 220VAC generator breaker. While during this condition, I can turn on everything/every circuit in the house and the generator will power everything without issue until I try to start the A/C and the cycle repeats. (I know to give the A/C n Generator the best chance to restart is to turn off all the other circuits, my point is to show there is nothing else out of the ordinary while in this condition) I think I need a larger Startup Capacitor for my A/C Condenser (pump and fan). How would I figure out what type/size/capacitance, ......Capacitor to purchase and how would I identify the terminals such that I can swap it out with the existing correctly? Please note: I do not need a lesson in the generator peak/run and house demand (load). I am that technical (for a mechanical guy, but this is Magic Smoke Stuff and so I am in the deep end and barely treading water). For review: 1.) The generator runs the house with no issues with the A/C off. 2.) The generator runs the house with the A/C starting first and the rest of the house load added after the A/C starts the First Time. 3.) The A/C will seldom start the Second Time even if all the house loads are turned off and only the A/C is connected to the generator. 4.) Other than this Second Start (or anything after) failure of the A/C running on the generator, the A/C works flawlessly on-grid power as does the rest of the house. Thank you in advance for any help.

[@sheepishmclemmingston5550]

What you are needing to add to your A/C unit is known as a Soft Start capacitor. It reduces inrush capacity needed from your generator upon the startup of the AC's condensing unit, which likely requires a substantial current draw when engaged and until it reaches its normal operating running speed, which likely takes a few seconds. This increased draw happens for large enough of a draw and for long enough that it trips the generators breaker because it overly taxes the generators system to a degree that it would either A; bog it down to a point at which it would stall the engine or B; overload the generating capacity of the core itself and start heating to a degree where the internals could become damaged or fail completely. Just look up "A/C Soft Start Capacitors" or "A/C Soft Start Systems" and there will be a wide array for you to research and choose from. Hope this info helped and good luck with your project

[@PrivateOrdover]

I need a lil help.. I am trying to get a pool pump motor to run off of my dc to ac inverter and just hums and then the inverter shuts down. I think if I add a start run capacitor to the circuit it should work fine. I am hoping .. it’s a 120 volt 12 amp 60 hrtz motor. Which start/run capacitor do you recommend. I am thinking a CBB 65 will work. But don’t want to blow the motor.. any suggestions ?

[@syedhussain2656]

Hi there, I am looking for 6 microfarad x3 capacitor. Could you explain what type 9f capacitor it is? Thanks

[@josephe.digiorgio2294]

Have an old Craftsmen 3/4 HP motor. Obsolete parts. It has a capacitor mounted on top. I have to say its a start. Not sure. Its dual voltage. Old cap was 233-280. Old cap part # was 37211 no info available any more. Not sure if that was correct replacement. Having problem finding any information on this saw motor. Old model Craftsman model is 113-12060. Some blogs say it was an old Emerson motor made for Sears. Old cap was shot. Just want to make sure I insert correct size. This was my dads saw , trying to restore it. Any help appreciated.

[@TEMCoIndustrial]

Just make sure that the new capacitor: 1. Capacitance is roughly the same: 233-280uf 2. Voltage is same or higher than you are powering your machine with. If you are using 120volts. Cap should be at least 120 volt rated. Higher is ok. 3. The new capacitor will fit in the can on top of your motor. Smaller is ok. Outside of that, you should be good to go! Good luck!

[@twittertubebook]

do you ship to Canada?

[@TheDeLaCruzSquad]

I would like to see the voltage meter readings when you are checking the capacitors in this video. Thank you

[@pauleyler1731]

I have a Lakewood floor fan that runs slowly or not at all on low settings.It does not seem to be a lube problem. Any ideas.

[@zdzichzcan2808]

What capacitors should I connect to the 400Watt generator, any suggestion please . I am using capacitors 8 micro farad and as soon as I plug in the light. the power is gon generator is 650 watts

[@jb-ik8sj]

Thank you. Very informative video

[@MYCHANNEL-on1cp]

have a single phase century 5 hp 1800 rpm motor, has a 330 volt 408 to 480 mfd cap that blew. it runs with a 220v cap i have in stock, similar mfd range, is that ok to use in an emergency?

[@RHH1095]

If a motor calls for a 5mF run CAP will the motor be damaged if you use a 7.5 or 10mF run CAP?

[@sorayanamazi3723]

I have a 220 VAC sanding machine motor, replaced Now starts slow and take time to gradually get to proper speed (around 5-8 sec). Is it the wrong replacement mtor or starting capacitor? Should I increase the capacitance? Appreciate your help.

[@christopherherrick381]

I’m confused about you usage of “duty cycle”. I’ve only been exposed to the term regarding a DC square wave signal at a fixed frequency and duty cycle refers to how much of the wave is “high” vs “low”. Never heard it used discussing AC signals. I would appreciate any feedback.

[@robl3219]

Great video. Very well explained. !!! Very educational

[@TEMCoIndustrial]

Can you explain how you are running an AC motor on DC power? This will help us understand more about your set up.

[@Papasquatch73]

All VFD‘s that run AC motors is actually positive negative DC that mimics ac

[@markfallensiangulube2616]

am using a schultz angle grinder, it has two capacitors, now I have a problem with a big capacitor from it which has some drums inside(capacitor with drums inside), what type of capacitor can I repress it and can a capacitors from a capacitors Bosch grinder work in it ????

[@TEMCoIndustrial]

What we wanted to illustrate with the exploding start cap was that you can't use it as a run cap. Run capacitors do not come with high capacitance ratings as most start capacitors. You'll rarely find run caps larger than 150 mfd. Capacitance ratings for start caps, on the other hand, can go as high as 1200 mfd or more. Like we mentioned in the video, while you could use a bunch of run caps in place of a start capacitors to get up to the required mfd rating, you'd need adequate mounting space.

[@cesarmendoza470]

What cause that high rating capacitor to burst?

[@cocolove7591]

I have a 240v 3 phase 7.5hp 5.5kw induction motor for a heavy duty mixer and would like to run it on single phase as i do not have 3phase connection at my location. will i be able to convert it to single phase with cap or i wont get the amount speed from the motor?

[@cheeseheadfiddle]

I have a grizzly dust collector motor wired for 220. Seems the capacitor is bad. Opened it up and it’s a 300mfd, 120VAC capacitor. Am I right that that is the wrong capacitor? Possible that the motor was rewired for 220 and the capacitor was not changed? I got the unit used.

[@loucal3470]

Well worth watching.

[@707SonomaComa]

I was looking at Baldor 6" Bench Grinders. They have approx. 14 different models! One of the descriptions says: Built for heavy duty grinding, powered by 1/3 hp Baldor PSC type motor (except 612E & 662E which are split phase) What would be better for that type of bench grinder, a (PSC) Permanent Split Capacitor or a Split Phase motor? Is one harder or take longer to start? Do you have to spin the wheels to get it going?

[@davidg8032]

Hello... Good video. Educational.... Thank You.... I've got a question that I feel you are highly capable of answering, even in your sleep. (that's a compliment)... I'm looking at 2 capacitors in my 5 ton unit. Both say "motor RUN capacitors" on them. The smaller one is a 10 MFD 440/370 which I would guess is actually for run. The second one is a 70 MFD 440/370 which I think should actually be a start capacitor. What I surmised from your video is that the 70 MFD seams awful low, plus again, it says on it "RUN" capacitor, not start capacitor. Any thoughts and response would be greatly appreciated. Hope all is well. Thank You

[@TEMCoIndustrial]

They are both as you suggested, run capacitors. One is for your condenser motor and the other smaller one is for the fan.

[@davidg8032]

@@TEMCoIndustrial So is there no start capacitor???? Thanks for taking the time to reply

[@TEMCoIndustrial]

Either the start capacitor is hiding in a different location or it is possible it uses a special high resistance rotor and no start capacitor although this is prety unusual.

[@davidg8032]

@@TEMCoIndustrial Again..... Thanks for taking the time to reply...

[@ArcanePath360]

Not sure if this is what I'm looking for. I made an Arduino powered motor by replacing existing electronics with my own circuit, but recently it intermittently doesn't start, just hums. The only way to get it working is to knock it hard against something and then it seems to run okay. Have done something wrong like run too high a voltage through it? It's happened on 2 of my motors now.

[@emmettcoen]

Hey man.. Great video, my motor is humming, I swapped over a capacitor I had in shop, it started motor but cap exploded hahaha after a minute, I will drop a link for my problem, it is a pdf file with all parts listed, I think it is a run capacitor I need, it's the the 66uf 50Hz.. One on the list thanks you my good man

[@gatairengkong3956]

Hye.. im from malaysia ..My motor 110v 550watt 1680rpm.. what type and correct value of capasitor can i use for my motor

[@onenewworldmonkey]

I have a 110v motor with 4 wires (2 start and 2 run) along with a remote start capacitor using 40 mf. I wired the run wires up and plugged it in expecting a hum (I disconnected the capacitor and all wiring), but IT STARTED UP counter clockwise. I switched the incoming wires and it started up running clockwise. I tore it apart and it has no centrifugal switch. I bought a used Corghi tire machine for $300 because the guy had the motor and switch out in a bucket. Two wires had .7 ohms and two wires had 7.6 ohms. The tire machine rotary switch was in pieces and had burn marks on it. What would tell the start windings and start capacitor to turn on and off????

[@JohnJones-jj1df]

I have a rather large electric motor that needed a new cord wired on when I bought it. With that done, the motor ran but had no torque. I bought it to spin a table saw but it would not start. I could spin the blade and it would barely run. One capacitor is a 110v run/start and the other is a 220v run capacitor. I'm thinking this should be wired as a 220 volt motor? Thoughts??

[@simpliciocamirino2271]

Thank you for that sharing sir.

[@austinhydroax]

really do like your videos. I have a compressor and need to use a generator to run it. Vendor says don't use a generator. Is there a percentage increase on the size of the start capacitor that would make the combination of motor/generator a little more friendly and work together a little better? This is what I have now, Microfarad Rating: 324-389 165 volts. Thanks!

[@ApexHotShot]

Thanks for the information and demonstration. I have one question about start capacitors. I assume they are parallel to the load … ie., across the 240 vac power. What makes it “drop out” of the circuit once it does its work?

[@Gage1251]

A centrifugal switch is used. This opens the start capacitor circuit once the centrifugal switch hits a certain amount of RPMs.

[@tonybletas431]

Replacing a run cap on a bandsaw, the original is a 2 prong and the replacement has the same values but is a 4 pin. If they’re interchangeable does anyone know which pins do I connect to?

[@robertmoreland1220]

I have a 10hp 230v three phase air compressor I am wanting to run on 230v single phase what start capacitor and run capacitors would you recommend to generate the third field?

[@rayg436]

can you use a microwave capacitor as a run capacitor on a treadmill motor?

[@wolfmanjacksaid]

So just to clarify, you can replace a start capacitor with a run capacitor if it has sufficient micro-Farads? For example I have a 8uF start capacitor, I can replace it with a 8uF run capacitor?

[@rodgerhatfield3068]

Thank you! Great video!

[@vuyisanikondile8110]

can u help me find these videos on how to test a DC motor, slipring motor and a single phase motor..its for my trade test that am writing monday..Or explain to me how to do these test

[@kf5hcr176]

Very well done. Thank you

[@karney6583]

Do you recommend the screwdriver method for discharging them?

[@MavG]

I always do this, thinking for some reason is still charged before measurin with the multmeter. But i didnt know these capacitor were able to hold DC Voltage when they say is AC voltage. In any case, after a lot of years this is the only method i used. Of course, if is charged and you dont know it prepare for a little spark.

[@TEMCoIndustrial]

This isn't something we specialize in, but you can look up info on power factor correction using capacitors.

[@bobbartos4616]

I have issues with a 220 volt dual capacitor motor, when the motor is switched on, the motor turns but then the breaker cuts in. I changed the start up capacitor with a new one, same issue. I returned the motor to the supplier and waited 5 weeks for it to be returned. Once I received it I immediately plug it in and it started and the bare motor ran. Once I put the impeller on and secured all the parts into the housing, it doesn't start!! Is the weight of the impeller cause a load for the motor not to start? I changed the start up capacitor again, still same result. I disconnect the breaker from the circuit, it finally started!! But then it died because the start up capacitor began leaking oil.....im lost!! Can it be the breaker at fault?

[@rogerk9050]

I have a 2002 Fleetwood Bounder 32' rv. One of the rooftop (Coleman Mach) air conditioners stopped throwing cold air because after getting up there to check it, there was oil everywhere on the wires and it smelled from the wire casing melting. Is it safe to just replace the hard start capacitor, or should I replace all 3. (There is a bundle of 3 there). Thank you for any thoughts and/or responses. (Roger)

[@SP330Y]

@TEMCo Industrial Power My start up capacitor on my compressor is only 31.5uF at 400v (2 terminal) if i buy a much bigger uF rating ie (400uF) would it make my compressor start easier. Mine at present doesn't always start up every time, sometimes it buzzes upon start up and freezes,if i spin the motor by hand it will start up, is my start up capacitor faulty and would it cause these start up problems??

[@Nomujy4u]

I do understand the main differences between a run capacitor and a start capacitor and their purposes but what I don't understand is why did replacing the 5uF run capacitor on my spa circ pump motor fix its problem of not starting?

[@simpliciocamirino2271]

Thang you for that sharing sir.

[@jerryjamify]

I have a couple carpet blowers that run off and on. Would this be a capacitor problem. They run for ten minutes and stop for five minutes

[@danieljameshughes9480]

Good. Helpful.

[@BoringFlightVids]

Quick question, Im building a AC circuit with an AC motor, and i was planning to use a motor start capacitor. The power supply would not be able to supply the current needed to start the motor, so i was going to use a capacitor to give the motor the higher current surge it needs to start. am i thinking of this correctly? or do caps not supply current surges in AC like they can in DC. Thanks

[@TEMCoIndustrial]

Start capacitors in an AC motor circuit don't handle surge current like in DC, rather, they delay the AC wave form as it enters into another winding in the motor. This gives you a different phase in the magnetic field to allow the rotor to begin turning.

[@houstontxhouston]

so the capacitors do not have polarity? my air compressor has similar capacitors like the black run one you have and don't see any signs of showing what side is negative or positive (one blue wire and one white wire).

[@valveman12]

Hi I have a small 10" Delta Bandsaw. The capacitor in the motor is a CBB60 SH (16uF 250V). It looks like a starting cap (Black Case) but has low cap value to suggest it is a running cap. The cap is located in the case screwed onto the motor. The motor is a 110V 2.7A. How do I know if this is a running cap or a starting cap. I hope it is a running cap because i want to install a speed control. Any help appreciated.

[@OcRefrig]

Good Video! Thanks for Sharing! Happy New Year!!