INDUCTIVE KICK BACK

[BAZZTECH]

How does one design an RC snubber circuit for a 120VAC solenoid valve so I do not fry some switch contacts when I de-energized the coil? Would I need to get the inductance from the manufactory or can I specify a MOV and how?

 

[ScottyUK]

Have a look at Evox-Rifa's rather useful application note.

http://www.evoxrifa.com/cap_catalog/rc_units/gen_info_rc.pdf

At 120V AC any half-decent relay should be able to switch a solenoid coil without excessive contact damage. Why do you anticipate a problem?


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Sometimes I only open my mouth to swap feet...

 

[itsmoked]

MOVs work well BUT!!!

They only work for so many cycles. They waste less energy than snubbers. If your coil changes states a couple of thousand times a year MOVs are the ticket. If your relays shift a hundred times a day... You need a snubber.

What's the score?

Keith Cress
Flamin Systems, Inc.-

http://www.flaminsystems.com