how relay contact can be protected from di/dt?

[tramp]

Hi everybody,
I am using a relay contact to drive contactar coil(ac, 2A)which is at remote place.
How can i protect relay contact from di/dt at relay contact end.

 

[C-Man]

You culd try using an R/C combination (for example 100 ohms in series with 220nF snubber circuit) or a varistor parallel to the relais contact.

best regards

 

[adedia]

hope this help

 [url]https://www.naisweb.com/e/relaye/mech_eng/mech_eng_rtia/idapm4w.html[/url]

 

[vicky29]

I'm new to this. can i know what is "di/dt at relay contact end" ?

thanks

 

[IainMcPhee]

Several ways there are to do this. First, try the capacitor idea. Put it parallel to the contacts, about .1-1 µfd should do. The other way is to put a diode across the coil of your contactor. Make sure that the diode is rated at a high enough voltage for the contactor coil (add about 20 volts at least to the coil's rated voltage), the same for the capacitor.

 

[tramp]

Thanks everybody for valuable solutions.

Hi vicky29

"di/dt at relay contact end" means I want to protect reley contact for high inrush current of load and load is not at my product end it is at user end.