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Description: These are massive single pole - double throw (SPDT) sealed relays. This means that when current is applied to the coil it throws a simple changeover switch, terminating the connection from the NC contact to ground and closing the NO contact. Use them to switch high voltage/high current devices.


  • SPDT Relay
  • Contacts Rated up to 220VAC @ 20A
  • Coil Voltage: 5V
  • Fully Sealed


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Customer Comments

  • These are great relays, but IMNSHO, not so great for hobbyists on account of their closely-spaced PCB contact pins. Getting the most safety and performance requires a knowledge of high-powered PCB and/or Breadboard design techniques. If you know what you’re doing, that’s great- but if, for instance, you are unfamiliar with the concept of creepage, or selecting the right gauge wire for an application, you can get into some trouble.

    I think that a much more hobby-friendly device is something like this: http://www.mouser.com/Search/ProductDetail.aspx?R=T9AP1D52-12virtualkey65500000virtualkey655-T9AP1D52-12 This one is literally only a few cents more, and electrially identical, but use Faston connectors instead of PCB pins.
    When it comes to building high-current/high-voltage circuits, point-to-point wiring is easier and safer to do with the tools available to the average hobbyist. I cringe when I see photos of kludgey-looking projects controlling things like heaters and air conditioners with sloppy and inadequate wiring and connections. Please consider offering a different version.

  • The same datasheet seems to cover both of these relays, and everything matches. I don’t see what problem you are running into, rsp.

  • It’s hard to tell what this really is because the pictures, part numbers, and data sheet don’t match. Save yourself a headache by spending an extra dollar to buy the P/B name branded part (COM-00101) instead.

  • Hate to ask what appears to be a rather newbie question, but does the direction of current flow through the coil matter? I’m designing a PCB and simply want to be sure the polarity is not an issue.

  • I would like to use this in a three-way switch system, is there a way to accomplish this or should i get a different relay? What is the purpose of the other pin not used on the control board? Update: I finally got a continuity test from NC to COM, there was some stuff covering the pins blocking the signal

  • What reason might there be for a relay to “click” but not actually close the switch? Is it just a bad part?

  • These are rates for AC current, but what about DC? I’m thinking of building a railgun, which involves a lot of very big capacitors (on the order of 300v) going off in parallel, and I need something with which to switch them. Will this do the job?

    EDIT: Nevermind, the datasheet says 28v, which is less than 1/10 of what I need. I’ll keep looking.

  • Have you seen SSR-25DA? It lets 25A and you can get it for 5€: http://dx.com/es/p/ssr-25da-25a-solid-state-relay-white-134494

  • I got the link for this relay from reading the Sparkfun tutorial ‘Controllable Power Outlets’. The relay in the tutorial is pictured with a control board containing resistor, LED, etc. Does Sparkfun sell this item with the board? Or do I have to buy that somewhere else?

  • I hate to be “That guy”, but, EAGLE footprint number, por favor?

    • Looks like it should be: SparkFun-Electromechanical.lbr / Device: RELAY / Package: RELAY-T9A or RELAY-T9A2 (different outline)

  • Can this be mounted on a protoboard?

  • The correct datasheet for this relay is http://www.bcrelays.com/Relay.JQX-15F.pdf

  • I have a few of these and the coil operates at 5 volts. Almost like they planed for them to be used with an arduino. The data sheet is somewhat confusing because it cover many relays of this type.

    • Can you drive this directly from an Aruino?? It says power consumption is 0.9W @ 5.0V, that’s 180mA, which exceeds the current capability of an Arduino port.

      • You cannot drive it directly from an Arduino, but you can add a transistor to the circuit. The Arduino activates the transistor, the transistor activates the relay. See the Relay Tutorial to see exactly how this is accomplished.

  • What is the maximum DC load it can handle?

  • What’s the coil voltage? I checked the data sheet, but it describes a range of relays with coil voltages from 5VDC to 110VDC depending on the part number, and I don’t see a number in the pictures that look like it matches the datasheet.

  • skimming thru the related products, i can see the first image matches http://www.sparkfun.com/products/101 exactly
    looks like they just copied the image

  • 00101 is the 30A version. Likely it’s exactly the same in outward appearance, except for the numbers, but the 00101 is beefier on the inside

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