What kind of filter is this?

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uwscsi

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Hello!

I am trying to figure out this filter, but I am having difficulties understanding it

The filter is mounted after a circuit breaker and before some zenerdiodes and a AC feedthrough capacitor.

My first guess was that this was a bandpass filter, but since I can not explain it, I really do not know...

Any suggestions?
 

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Basically it is a balanced low-pass filter.
Its purpose is to keep RF noise out of some piece of equipment.
The "zener diodes" you refered to are probably "Transorb" type surge arrestors for limiting voltage spikes.

JimB
 
Thanks for your quick reply.
The Zeners are for dealing with transients so your "guess" is correct
And the filter is of course there to deal with RF noise, but I have not seen this design before (230V/60Hz lines).

An explanation would be appreciated.
 
Last edited:
Hi there,

Looks like a line filter to me. I keeps noise from the line from reaching the
equipment, but also keeps noise from the equipment from injecting into the
line.
 
MrAl said:
Hi there,

Looks like a line filter to me. I keeps noise from the line from reaching the
equipment, but also keeps noise from the equipment from injecting into the
line.
Click to expand...

I am in particular interested in R1 and its function in this circuit.

Concerning the noise from equipment entering the line, should not the feedthrough capacitor at the exit deal with this (not in the posted image)?
 
uwscsi said:
I am in particular interested in R1 and its function in this circuit.

Concerning the noise from equipment entering the line, should not the feedthrough capacitor at the exit deal with this (not in the posted image)?
Click to expand...

The purpose of R1 is to discharge the capacitor, which could be charged if the filter is disconnected.. its a UL requirement.
 
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