I recently ordered a 50 pack of relays on sale for 5 dollars at electronic goldmine. They have 9 pins each and they are labled rk1-24v Ark112 910 25m. I know that they require 24 volts but I can't figure out where the coil is and where the connections like NO and NC are, nor can I find a datasheet that tells me this. I tried hooking up 24 volts to different pins, but I heard no click. So how can I find the right pins to hook the relays up?


If you have 50 of them, one easy way to figure the pins out would be to crack one open and have a look inside. The coil and connections should be clearly visible.

Another way is to use some Google-Fu and try the code or parts of it (you can add "relay" or "datasheet" to help narrow things down) and you may come up with something. I just had a go and I think this looks like your part's datasheet.


It should look something like the above if it is the right datasheet.
If you look closely you can see a similar format for rest of your code on the package example (the ARK-110 612 25W bit)

Since yours appears to the "single side stable version", this should be the pinout for it:

Relay Pinout

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  • \$\begingroup\$ Figured it out, I guess polarity matters on this relay! \$\endgroup\$ – skyler Dec 27 '12 at 2:25
  • 2
    \$\begingroup\$ @skyler - If that's true, they probably have a built-in flyback protection diode. \$\endgroup\$ – Connor Wolf Dec 27 '12 at 3:17
  • \$\begingroup\$ So what do they mean by high frequency? Is it \$\endgroup\$ – skyler Dec 28 '12 at 17:58
  • \$\begingroup\$ The time that it takes it to switch between it's two states? \$\endgroup\$ – skyler Dec 28 '12 at 17:59
  • \$\begingroup\$ @skyler - No, it means it's capable of passing high frequencies through it, i.e. it has a high bandwidth (up to 1.5GHz according to the datasheet) This is why it says it's a "Microwave Relay" and mentions typical applications of satellite tuners, test equipment, etc. It's not a "typical" general purpose relay (e.g. for power switching), it's for switching signals, hence the 50/75 Ohm impedance and low current specs. \$\endgroup\$ – Oli Glaser Dec 29 '12 at 10:56

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