solid state relays

[Rover]

FYI

I was browsing allelectronics.com for surplus, and came across som 40 Amp solid state relays 3-32v trigger at 25 mA for 15$. I'm buying some of them to use with my controller , and a load dumper.

These typically go for a lot more money, and the nice thing about them is the low trigger voltage/low trigger current / high current switching   (can be triggered by most homemade controllers with 5V-12V)

Having screw terminals is a plus, as you don't have to worry about how thick a PC board trace needs to be to handle the switched current.

http://www.allelectronics.com/make-a-store/item/SSRLY-42/40-AMP-SOLID-STATE-RELAY/1.html

[boB]

I think this is the part they are referring to...

http://www.cosmo-ic.com/ProductDetail-H.asp?title=Solid%20State%20Relay

It looks like it's a triac and good for dumping on the AC side of a turbine

or on the AC output side of an inverter.

Cosmo does have DC MOSFET types too, but they are very low current.

There are some decent DC SS Relays out there that I have seen in the past.

boB

[Rover]

That was the plan... dump before rectifiers, controled by my stamp, or pic axe.

[Opera House]

Provide enough heat sinking for the relay.  These triac units have high insertion losses.

[Rover]

Yeah, I think I'm gonna end up using them to switch some small AC stuff off of my small HF inverter or find some other use for them

I'm gonna stick to my original plan and dump as needed from DC side, i just couldn't pass these up though.