【IoT training lesson beginners #07】why use RC snubber for AC contactor

KinCony Internet of things training course will consist of two parts: theoretical principle and practical training. In the early stage, the control principle and hardware diagram for different smart solution devices will be explained by some videos lessons. In the later stage, video lessons will demonstrate the practical operation step by step.
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[@wilmacchrismo1759]

Thank you Mr Xu Wei for this informative video.

[@betablocker50]

This Video I was waiting for . Thanks a lot

[@amrsohil2708]

Thank you for this informative video

[@haazmedia]

Great video, thank you sir

[@gok_dogan]

Thank you very much for your explanation ... So I met the same problem like 👍👍👍

[@KinCony]

you are welcome.

[@Pattuvarayan]

Great man👍

[@parthpatel1605]

I am unable to understand your english accent but get your point complete understandable. Thanks sir❤🎉

[@KinCony]

you are welcome

[@philipgbullas]

thank you sir, new subscriber here!

[@KinCony]

thanks

[@alihassanalawadi]

Thank u bro.

[@ZoomtronicBlogspot]

I just implemented snubber circuit on my water heater, contactor caused esp32 to reset , first I tried to connect to contacts of the three phase contactor snubber circuits, and it helped for awhile, but real issue was coil of the contactor.

[@KinCony]

RC connect with AC contactor's coin.

[@parthpatel1605]

Same issue was with me☝️in three phase contactor when ever I control it via MCU.

[@Efdlabs]

Hello Sir, thank you for the video. I found on the market the arc suppressor ROXBURGH EMC XE01010 that I would like to use with a 40A contactor, with max current limited to 16A. All the parameters fit with your indications except for the resistor power that is 1 W instead of 10 W. It will be a problem? I thank you for your help 🙏

[@KinCony]

i think it's ok, if use by 16A.

[@deepalps]

Sir, I am using a 3 phase contactor to switch a 25kvar capacitor at 440V(33A at 440V), can u suggest the right values of capacitor and resistance that can be used as a snubber to supress arc and protect the contacts of the contactor.

[@KinCony]

resistance: 250ohm 3W capacitor:103 1000v

[@khaleddawoud2862]

thank you very much . i need videos for how can i choose(calculate) capacitor and resistance for reduce interference . plz send me link for vids

[@KinCony]

The resistance and capacitance values under the conditions of AC220v and AC380v have been listed on the blackboard. These are classical values, which can be used directly.

[@TechnicalAlrounder]

Sir my 16A 3phase contactor coil is burnt, now i want to rewind this contactor coil its winding area(core sectional area) is 0.75inch*0.5inch sir can tell me the how many turns i have to wind for this 415vac contactor coil

[@KinCony]

You can find the formula for making transformer through Google

[@TechnicalAlrounder]

Can you tell me this formulla which suits this 415vac contactor coil

[@ajayshokal7193]

Hello sir... We use 10AMP as well as 25AMP AC contactor, please can you suggest C,R values for Both Contactor?...

[@KinCony]

in video's value can both use for 10AMP or 25AMP.

[@adriandebski3661]

Do you need to use a similar system when using relays with a 12V coil?

[@KinCony]

what's your means?

[@johnt.8936]

No, just a diode when using dc coils.

[@adidiqbal2975]

what is name the part yellow color ?

[@KinCony]

CBB capacitance

[@user-nt4ie4iv6l]

Is the surge voltage clearing method?

[@KinCony]

yes

[@Ragavenutb]

Hi, can this high voltage transient damage contactor coil insulation & power factor switching relay? Can you also kindly explain how to calculate required dampening resistor for high in rush current while switching contactor at capacitor bank, Thank You.

[@KinCony]

use snubber will protect the contactor and relay,avoid shock. resistance: 250ohm 3W capacitor:103 1000v. use for AC220V or AC380V AC contactor.

[@Ragavenutb]

@@KinCony Thank You. For three phase,rc snubber has to be put in across or parallel to contacts so as to reduce arcing on the contactor contacts?

[@KinCony]

@@Ragavenutb yes, just parallel to ac contactor. 3 phase and 1 phase contactor is same way.

[@Ragavenutb]

@@KinCony Thank You. Can i know if you are available to undertake some Iot projects for my company and also i wish to purchase 6 channel rc snubber you show on one of your videos not sure which video but i saw it, i require 10-20 pcs but your shop on aliexpress and aliexpress itself is inaccessible due to restrictions from our govt. Kindly reply Thank You.

[@KinCony]

@@Ragavenutb ok, when you have project need help, you can tell us. we have 8 channel RC snubber, you can use for 6 channel. can you open alibaba.com webpage? we can make online order.

[@anurajn2616]

My contactor output rating is 40A, when switching the contactor , 16x2 LCD shows weird characters, and lora communication get stucks. So what are the ratings for cap and res for my contactor.

[@KinCony]

what work voltage? AC220V?

[@anurajn2616]

@@KinCony 220v ac, ur explanation ur explaining 103(0.01uf) capacitor, but u have connected 104(0.1uf), which is correct

[@KinCony]

@@anurajn2616 104 is ok.

[@anurajn2616]

@@KinCony thanks for ur reply

[@anurajn2616]

@@KinCony sir, for 220v ac contactor what will be the value reverse voltage, around 1000v, or is it depends on the coil current, is there any formula for calculating this

[@christophernwafor9779]

Is this device same as Arc suppressor for AC contactors?

[@KinCony]

yes,it's same.

[@bikinko85]

Sir, do we need a rc snubber for 24vdc coil contactor?

[@KinCony]

if DC coin, not need to use RC snubber.

[@bikinko85]

@@KinCony thanks for very quick reply. My mcu sometimes get stuck (hard fault exception) when switching the contactor although I installed a flyback diode on main board. Do you have any suggestion for me?

[@KinCony]

@@bikinko85 using AC contact?

[@muhismul8158]

That so amazing I want to learn this sir How I can get that lesson

[@KinCony]

here is playlist: kzbin.info/www/bejne/jqasaYRjp7Sem5I

[@ruimarinho]

Shouldn’t the contactor be installed after the breaker and not before?

[@KinCony]

yes, now you have installed before, before is better.

[@ajayshokal7193]

Hello Sir, At Relay Output I have use single phase AC contactor and then it will convert AC to DC convertor Transform and it will given 48VDC to next DC contactor for operate 48V DC motor ...The problem is At One stage Relay is taking extra time to off...like after 3min relay should off , but it's not...it taking 4 min...

[@KinCony]

? i don't understand you, what do you want to do?

[@ajayshokal7193]

@@KinCony Actually sir I am operting two relay in different time frame..Like first realy will ON for 3 seconds and second relay will ON For 3mint.... Device is working fine but at one time it will hang... So relay is not operating in its given time like 3 min and 3 Sec relay.

[@ajayshokal7193]

@@KinCony I think it's noise interference From load ...

[@KinCony]

@@ajayshokal7193 if use DC, not AC, i think no interference.

[@ajayshokal7193]

@@KinCony oky sir... I wanted to show you some schematic how can I

[@sabrahmed9800]

استر يارب

[@martinspukitis1954]

Aren't there AC contactors with integrated RC snubbers?

[@KinCony]

not easy to find this type, because space of AC contactor inside is very small, not enough space for resistance and capacitance.

[@henrybikeman]

Absolutely appalling presentation. I’m sure the gentleman is well qualified in electronic engineering, but this is a classic example of why someone who is not trained in training should no attempt to do so. Especially as it’s pitched at beginners.

[@KinCony]

exactly