Hello expert,

Please refer attached image for My issue ,

I have connected RC snubber across Relay contact. RC value is 220 ohm & 0.1uf, one contactor is operated by this relay.

but when i deenergize relay coil, contactor does not get off. need your support.

 

hi Ravi,
What are the ratings of the relay contacts and the load.?
It could be the contacts are 'welding' together, contacts maybe well worn.??
E

 

relay contacts are 7 Amp rating, & Load is less than 1 ampere, if i remove snubber than it works well. so contact is not sticked.

some other issue is there.

 

hi,
When it is in the fault state ie: can you see if the relay contacts are really closed, when they should be open.?
Thats if its possible to see the contacts.??

 

hi,
I estimate that the impedance220R and 0.1uf is approx 30k Ohms would should not allow sufficient current to hold on the load.
Is the 0.1uF mains rated X2 type also is it definitely 0.1uF.?

EDIT:
https://www.google.com/url?sa=t&rct...-capacitors/&usg=AOvVaw3mowVOO-uY_natJ1mBkcYU

 

yes this is 275v AC, X2 type capacitor

 

hi,
Puzzling.
Ref post #4.??

 

I broken the Relay & checked physically, relay contact is open, but still contactor contact is not open, it means snubber is able to supply the holding current. so what value of snubber should i have to use. contactor coil resistance is 1.58 kohm

 

hi,
Thats suggests the 0.1uF is defective, do you have a spare.?
The combined 200R and 0.1uF are about 30k ohms, which should not allow sufficient current to energise the load.
Do you have a 0.01uF or 0.047uF you could use as a test.??
E

 

i tested with 1K in place of 220ohm but still its not open. tested with 300K then its working ok

so what will be proper value for R & C

 

I would suggest a 220R and a 0.01uF [X2 rated cap]