# Minimum switching current for Mechanical switch

1. ## Minimum switching current for Mechanical switch

I have a switch which specifes the minimum switching current is 10mA at 12VDC. Now my circuit switches 11mA at 5V.
Does the power need to match ie IxV 0.01 x 12 = 120mW or would the 11mA at 5v BE SUFFICIENT???

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2. ## Re: Minimum switching current for Mechanical switch

Your switch rated for 12VDC at 10mA but your circuit switching at 5V it does not match

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3. ## Re: Minimum switching current for Mechanical switch

Hi,

You say it is 10mA "minimum" switching current. But you treat it as "maximum".
I doubt that 10mA is the "maximum allowed" switching current - but it may be possible.

Best if you post a link to the datasheet.

Klaus

I assume the 10mA is the minimum current you should run through the contacts.
So 11mA is within specification.
This "minimum current" is also known as "wetting current".
https://en.m.wikipedia.org/wiki/Wetting_current.

Klaus

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4. ## Re: Minimum switching current for Mechanical switch

Hi Klaus,
I can get my current up to 15mA if required but It's the 12VDC that is worrying me.

5. ## Re: Minimum switching current for Mechanical switch

Hi,

Where is the datasheet?

Klaus

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6. ## Re: Minimum switching current for Mechanical switch

This may be about contact cleanliness / aging, and a
non-ohmic low current I-V curve (many metal oxides
are funky semiconductors and of low quality when
grown in random nasty conditions).

Doesn't mean the switch won't work, now; maybe means
it will get noisy / crusty / resistive as it ages.

Unless by "switch" you really meant "relay"....

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