Relay OK to carry 50KHz sinusoidal current at 1.9A RMS

Status
Not open for further replies.
I don't think that the relay can perform at such frequency. Even if it works the life span will be reduced relative to solid state relays.
 
Reactions: treez

    T

    Points: 2
    Helpful Answer Positive Rating
it won't be switching often....surely it will be ok ?...its only 1.9A rms......is th eproblm skin effect?
The current never goes more than 1.9A rms becuase its from a current source.
 

Skin depth at 50 kHz is 0.3 mm for copper and even higher for bronze etc. contacts. Frequency dependent derating will be negligible.

It's definitely a problem for thick conductor bars, e.g. high current connectors or contactors.
 
Reactions: treez

    T

    Points: 2
    Helpful Answer Positive Rating
Frequency dependent derating will be negligible.
Click to expand...
..so are you saying that trhis relay will be ok with 50KHz , 1.9A sine current in the contact?

Do you mean carry on the contacts or through the coil?
Click to expand...
contacts
 

I think it should be fine conducting that current, the harder question is how reliably it can interrupt the current. High frequency arcs are more persistent, so your working voltage will be derated.
 
Reactions: treez

    T

    Points: 2
    Helpful Answer Positive Rating
Because of the possible arc over problem as stated by mtwieg, I would limit the peak AC voltage to no greater than the DC contact rating of the relay.
 
Reactions: treez

    T

    Points: 2
    Helpful Answer Positive Rating
Yeah, the DC rating is a good way to do it if reliability is important. Though that will require a much more expensive relay/contactor.
 
Reactions: treez

    T

    Points: 2
    Helpful Answer Positive Rating
Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…