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Question
why does chattering take place in ac contactors?
can it be avoided & what care does the manufacturer take to 
eliminate this phenomenon????
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
low voltage or voltage drop will cause them to chatter. 
Is This Answer Correct ?    15 Yes 2 No
Terence
 
Answer
# 2
Apart from the above correct answer,chattering may happen
aslo due to the loose supply wire given to the contactor
coil and also on the coils magnetic effect.
 
Is This Answer Correct ?    12 Yes 3 No
Srij21
 
 
 
Answer
# 3
Chattering will occur when there is no perfect contact
within the contactor, when chattering occurs the two
contacts may get weld together.This may cause a danger when
it is required to open the circuit or required to stop the
motor from the remote option.Chattering may also occur if
the contactor is undersized w.r.t load current.
 
Is This Answer Correct ?    12 Yes 5 No
Reshi
 
Answer
# 4
chattering occurs due to many conditions:
1. due to loose contact
2. dust contents
3. new product will not get contact very quickly but after some periodic operation it will be rectified.
4. under coil rating e.t.c

so major is no 4 & 2 this shall be taken care by manufacturer
 
Is This Answer Correct ?    4 Yes 2 No
Harish - Greenesol
 
Answer
# 5
It is mainly because of
voltage drop at
contactor..increase the cable
core size with spare core
 
Is This Answer Correct ?    2 Yes 0 No
Raghu
 
Answer
# 6
i agree with above answer and
also manufcture can add
sheded pole ring when it
design bcoz ac current flow
positive ok but naturle side
pick up not possible so and
thats reasen they add sedded
pole ring for continios hold
contactor.
 
Is This Answer Correct ?    1 Yes 2 No
Bhanu Dudhat
 

 
 
 
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