[GreenKeys] Solid State Motor Control Relay

[w9ddd at tapr.org]

The TU-170 uses a SSR.  Unfortunately, the parts list doesn't even list it, so I can't tell you much about it, except it is physically smaller than the eBay one you referenced.  


John, W9DDD


> On Dec 27, 2020, at 4:39 AM, ad7i <ad7i at ad7i.net> wrote:
> 
> Greetings Greenkeyers --
> 
> Has anyone tried to use a Solid State Relay (SSR) such as that shown below to control a TTY motor?
> 
> https://www.ebay.com/itm/1Pcs-Solid-State-Relay-SSR-40DA-SSR-25DA-3-32VDC-TO-24-380VAC-New/312717019695
> 
> I'm using two of these solid state relays on dehumidifiers in my basement, so that the safety switch in the condensate pump can interrupt the AC power to the dehumidifier if the pump can't pump.  The SSR's electronic "contacts" have the equivalent of two diode drops in series with them, so that at 1 ampere of AC current passing through the relay contacts will dissipate about 1.5 watts.  I have my humidifier SSRs mounted on a small heatsink but I think it's overkill for that application.  
> 
> But I'm wondering if SSRs, in general, would be suitable for a TTY motor.
> 
> The alternative for me is an old school mechanical contact relay, in particular:
> 
> https://www.mouser.com/datasheet/2/418/5/NG_DS_T9G_1216_1117-1281449.pdf
> 
> Please let me know what you think about using an SSR for a TTY motor.
> 
> thanks,
> 
> Paul, ad7i
> 
> 
> 
> 
> 
> 
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