I would love to hear from some of you enthusiasts about the idea of using a lower amperage rated relay to drive a higher amperage rated one. I found a very small (1.25" wide, 1.5 inches long) SIX DOLLAR circuit board that senses temperature, once it reaches the adjustable threshold, engages the 10 amp relay and whatever is connected to the relay is activated. VERY cool.
However, I was talking to SPAL this week and their 16 inch fan requires a 40 amp (surge) relay and then a 30 amp slo-blo fuse to make it work properly. You would think maybe the aforementioned circuit would be insufficient. However, what if you use that little $6 circuit and drive a standard Bosch style 5 pin 40 amp relay? So, you have a total of $10 into the parts to drive your electric fan system. Anyone have any thoughts on doing this?
