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Hi Kelly, I wouldn't hesitate to use an ssr in the right situation. If you find one that's intended to replace an automotive mechanical relay (available just about anywhere), it'll probably be immune to surges since the originals would control heater motors, cooling fans, etc. An obvious use would be to control the new light weight starters with built-in solenoids. The coil on these starters requires more current than a typical pushbutton can supply (maybe 10 amps) but much less than a typical 'old style' solenoid that must supply the full 200-300 amps to the starter. For boosting current capability of the tiny control stick mounted switches & similar stuff, I'd say go for it. If you have room (& the money) for a regular switch to do the job, then that makes more sense just for simplicity. Charlie not an EE but have built (& repaired) quite a few electronic gadgets Kelly Troyer wrote: To Ed and other EE types.............Would you consider using a "SSR" (Solid State Relay) as a master relay for all non flight critical electrical loads.............Example the "HDD-06V75" in the link below...................All opinions appreciated................... http://www.power-io.com/products/hdd.htm -- Kelly Troyer "Dyke Delta"_13B ROTARY Engine "RWS"_RD1C/EC2/EM2 "Mistral"_Backplate/Oil Manifold -------------- Original message from "Ed Anderson" <eanderson@carolina.rr.com>: -------------- If you are feeding an inductive load (motor) then when you turn it off - a voltage spike can be produced that can damage the diode if of sufficient strength. My gut feel is that if the diode can handle 60 amps then the spike from a small DC pump motor will probably not cause damage. However, being a belt and suspenders type of guy I would put the suppressor diode in the circuit – it can not but help to extend the life of the relay. Probably from 200,000 to 400,000 switches {:>) Others who understand these solid state relays can offer better advise. Ed Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com http://www.andersonee.com <http://www.andersonee.com/> http://www.dmack.net/mazda/index.html http://www.flyrotary.com/ http://members.cox.net/rogersda/rotary/configs.htm#N494BW <http://members.cox.net/rogersda/rotary/configs.htm> http://www.rotaryaviation.com/Rotorhead%20Truth.htm ------------------------------------------------------------------------ *From:* Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] *On Behalf Of *David Leonard *Sent:* Wednesday, June 24, 2009 5:52 PM *To:* Rotary motors in aircraft *Subject:* [FlyRotary] Re: DC/DC [FlyRotary] Re: Relay Woes Thanks for source Ed. I bought on of their dc/dc relays.. Do you think I still need to install the diode as well? Dave On Wed, Jun 24, 2009 at 10:52 AM, Ed Anderson <eanderson@carolina.rr.com <mailto:eanderson@carolina.rr.com>> wrote: Not certain, Dave. If it were a mechanical relay then it would be fairly easy to say “yes’ or “No” – solid state is a bit more complex. However, I am inclined to believe that when they specify AC voltage on the controlled side that they might mean it. Here are two relays from FuturLec that look identical. Note that the first one implies the load should be AC voltage while controlling voltage is DC. Then notice the next photo for DC/DC relay. This at least implies to me that perhaps with solid state relays – it may be significant whether you specify DC on the controlled side as to whether the solid state relay functions. For instance it might require the voltage to be alternating and would see DC voltage as no-voltage? SSR10A - SPST 3-32V 10A Solid State Relay SSRDC100V40A - SPST 0-100Vdc 40A DC Solid State Relay They can be found at: http://www.futurlec.com/RelSS.shtml Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com <mailto:eanderson@carolina.rr.com> http://www.andersonee.com <http://www.andersonee.com/> http://www.dmack.net/mazda/index.html http://www.flyrotary.com/ http://members.cox.net/rogersda/rotary/configs.htm#N494BW <http://members.cox.net/rogersda/rotary/configs.htm> http://www.rotaryaviation.com/Rotorhead%20Truth.htm ------------------------------------------------------------------------ *From:* Rotary motors in aircraft [mailto:flyrotary@lancaironline.net <mailto:flyrotary@lancaironline.net>] *On Behalf Of *David Leonard *Sent:* Wednesday, June 24, 2009 12:20 PM *To:* Rotary motors in aircraft *Subject:* [FlyRotary] Re: Relay Woes I think I may have found the answer on page 10 here (although for a slightly different relay). http://www.components.omron.com/components/web/PDFLIB.nsf/0/77056031AB35222185257201007DD66B/$file/D20G3NA1205.pdf If so, is that diode symbol reversed? wouldn't that cause a short to ground? Or do I need to install my pump so that the relay completes the circuit to ground? Aaah, yes, thats it... will require an extra wire out to the pump (located in wing). Still I dont really get it. Dave Leonard On Wed, Jun 24, 2009 at 8:34 AM, David Leonard <wdleonard@gmail.com <mailto:wdleonard@gmail.com>> wrote: For you EE types, I have a question. I am installing a smoke system and wanted to use a relay to control the pump. I bought this relay from Mouser that I thought would do the trick: http://www.mouser.com/Search/ProductDetail.aspx?qs=sGAEpiMZZMtLEhJ5P%2fNsZ6bnrz6%2f%252b%252bJvA50eSiydqPQ%3d The problem is that if there is any load (like the pump or even the 0.02A indicator LED I installed, then the relay will not turn off when I turn off the signal voltage. So either I do not understand how to use the relay, or I chose the wrong relay. I have checked my wiring in-so-much as to confirm that the signal voltage does turn on and off with the switch, voltage across the 'LOAD" terminals does disappear when there is no load but not when there is a load (current). Is it possibly because this relay is designed for an AC load? Other suggestions? -- David Leonard Turbo Rotary RV-6 N4VY http://N4VY.RotaryRoster.net <http://n4vy.rotaryroster.net/> http://RotaryRoster.net <http://rotaryroster.net/> -- David Leonard Turbo Rotary RV-6 N4VY http://N4VY.RotaryRoster.net <http://n4vy.rotaryroster.net/> http://RotaryRoster.net <http://rotaryroster.net/> __________ Information from ESET NOD32 Antivirus, version of virus signature database 3267 (20080714) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com <http://www.eset.com/> -- David Leonard Turbo Rotary RV-6 N4VY http://N4VY.RotaryRoster.net <http://n4vy.rotaryroster.net/> http://RotaryRoster.net <http://rotaryroster.net/> __________ Information from ESET NOD32 Antivirus, version of virus signature database 3267 (20080714) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com <http://www.eset.com/>