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

[treez]

Hello,

I wish to use this relay to carry 1.9A RMS at 50KHz (sinusoidal). Will that be OK?
(I do mean "KiloHertz" and not Hertz)


Relay Farnell 4444942
https://uk.farnell.com/te-connectivity/pcn-112d3mhz/relay-12vdc-spno-10a-tht/dp/4444942?Ntt=4444942

 

[Ogu Reginald]

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.

 

[treez]

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.

 

[Pha5e]

Do you mean carry on the contacts or through the coil?

 

[FvM]

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.

 

[treez]

Frequency dependent derating will be negligible.

..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?

contacts

 

[mtwieg]

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.

 

[crutschow]

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.

 

[mtwieg]

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.