Understanding Relay Spec's.

You shame hams everywhere, as it is quite obvious that you are an immature little bastard.

"John Fields" John Larkin

If the incandescent load is a * single * high powered lamp - similar LARGE de-rating factors apply.

.... Phil

Don't confuse him with numbers. They make him cranky.

John

Geez, your very first post to this thread was wrong, stunningly wrong, on electrical fundamentals. So of course you want to engage in endless philosophical wrangling.

Listen: incandescent, motor, and rectifier-capacitor type loads can have huge startup surge currents. That can blow out SSRs and damage relay contacts, and such switch devices are often heavily derated for such loads. That's almost too obvious to state.

And what's erroneous about my last quoted statement? Such loads do kill SSRs. Incandescents are especially interesting since, in addition to startup current surge, they often fail mostly-shorted.

As Phil noted, SSRs have to be hugely derated on current, 10:1 or more, to handle motor switching. Derated on voltage and snubbed and MOVd, usually, too. Turning off can be more interesting than turning on.

What's really tricky is using an SSR or a triac to switch the primary of a power transformer in a rectifier-capacitor power supply. Even more fun is tap switching same.

John

Bikinis? It's 55F here right now. When we see a good-looking woman, we're more likely to say "wow, she looks great in a parka."

John At 10:30 am it's 81* today, but that doesn't matter, the shapely college girls, wear bikinis even when the temp is in the high 60s*. They don't want to waste their time at the beach. Mikek, PCB ambassador

It provides an alternate path for current from an inductive load suppressing a contact damaging arc. Mike

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Ok, read over the app note, I want pick a contact arc suppression RC. On the third page under Capacitor Selection the author seems to arbitrarily pick

"John Larkin"

I am not referring to so called " soft start " circuits where a resistance limits the magnitude of any inrush surge, but to simply using a hefty triac as the AC power on-of control and a normal switch to operate the triac. The switch is wired in series with a resistor ( say 68-100 ohms) from G1 to gate.

The worst case inrush surge is still within the rating of a low cost 40 amp plastic triac ( eg BTA41-600) and the normal running current such that only a small heatsink is ever needed.

.... Phil

You are full of s*it... completely full of s*it.

In fact, I think that you are some sub-human shittard species.

You are s*it. You are full of yourself. You emit a foul stench.

What more does one need to say about John Larkin? You are full of yourself, and what yourself is comprised of is pure refuse.

Grow the f*ck up, asswipe.

Are you sure that is what takes place?

Wow! You're gonna need lotsa doctors to help relieve you of that feces fetish. You also need to be jailed for stalking.

Are you sure it isn't?

But he was wrong.

John

This group could not care less what you think. Man up nym-nuts and post your real name. Coward.

Ok Glimmerman, Here's your chance to show everyone on the group your vast knowledge.

Answer your question, "What does such a snubber do as the contacts bounce?" Mikek

Ahh, don't waste your time with this yellow coward, he is as pig ignorant as he is chicken. What a waste of skin. Coward.

Don't ask him electronics questions. They upset him no end.

John