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Retired control engineer. I learned a long time ago to put snubbers across AC coils and flyback diodes across DC coils.

Choose wisely. The online RC snubber calculators can be quite complex. It's almost a lengthy discussion topic in itself.

This is actually an uncommon snubber for DC, the standard is to use a diode or combinations of zener and blocker diodes. Also note that either kind of snubber alters the open and close response of the relay, slowing it down. Most of the time it doesn't matter, but for some process control applications, it is absolutely critical.

Since you are doing relays, you should do a video on the purpose of a “Flyback Diode”.

Key is to make sure snubber parts are pulse rated.  Awesome Video!!

Mr Carlson has wonderful examples of things that are hard to visualize. Kudos, sir

I haven't heard the term "snubber network" used in a very long time, but it sure did bring back memories of electronics school, and I sat here watching your video and just kept nodding my head, saying to myself "yep, yep, I knew that!"  I enjoy so much the way you explain the how and why of circuits.  Thank you!

Have been using commercially made RC Snubbers for decades.  Have a whole drawer in one of my antique Sprague cabinets filled with Cornell Dubilier Knowles RC Snubbers.  They are still made.  You can get them in different resistance/capacitance values.

I really like these informative videos where you show the explanations...this is great for new people just getting into electronics...and a fun refresher for us old coots  :)

Excellent information 👌 Thanks, Mr Carlson

Love your videos and they explain so much about electronics.  Been into electronics my whole life (as a hobbyist and ham) and I learn from you every time you post.  Thank you for sharing your knowledge.

Another fantastic tip!  Thanks Mr. C!

4:20 "this exact setup that I showed you in the thumbnail"
Thank you for a real video.

Thank you so much sir…❤For you..From Bangladesh 🇧🇩

I have a passion for electronics,  great video series 😊

Thank you Carlton! I want to apologize, uh, again, for kicking open your bathroom stall door at Tim Horton's the other day. I didn't realize you were "discharging your capacitors" in there, I just wanted to lay a bro hug on you.

RC snubbers can be useful in many circumstances but they can be a big problem in others. If you need to snub substantial energy it can be very impractical to use sufficient capacitance and low enough resistance to do the job. Devices like transient voltage suppressors can be superior, either alone or sometimes in combination with an RC snubber.
It is also important to realize that an RC snubber across a device switching AC creates a "leakage" current path that may be intolerable. The reactance of the cap is almost always the only factor that is significant. The 220 nF cap in the video has a reactance of about 12k ohms at 60 Hz. That's about 10 mA at 120 VAC.

Relay, contactor and switch ratings for motors are often based on the nominal power rating of typical motors. This really isn't a function of inductance, but the fact that a stalled (i.e. starting) motor produces zero back EMF (proper use of that term), meaning the current is mostly a function of the winding resistance. As the motor begins to spin, it acts as a generator, producing voltage counter to that which makes it spin. The difference between stall current (sometimes called "locked rotor" current) and full-load running current depends on the design of the motor. In some AC motors (e.g. "capacitor permanent split" where there is a capacitor in series with one winding to produce a phase shift) the difference might be pretty small, maybe 2 or so. With many motors the factor may be in the range of 5 to 10.
Though not much of a concern these days, many relays have a "tungsten" rating, taking into consideration the very high "inrush" current in a tungsten filament incandescent lamp.

This video failed to mention that AC is often, though not always, easier for contacts to handle simply because the current inherently repeatedly passes through zero.

Some relays use a permanent magnet to pull the arc between contacts into an elaborate, lengthy path that cools the arc and blows it out. A DC blow-out path may be simpler.

Wow! This is a great video Mr. Carlson! I never even knew that could happened ha ha ha

i love these videos! thank you