Float Switch Question

[Bud8Fan]

The float switches I have come across are rated for around 50 - 70 watts. I would like to install one in my future sump to kick my pump off should the water level get too low.

I have a Mag 2400 that is rated at 265 watts.

Are any of you using switches for higher wattage pumps?
What are you using?

Thanks in advance!!!

 

[rallysman]

Just use that switch to activate a relay.

 

[Bud8Fan]

I'm pretty handy when it comes to house wiring but pretty much a newbie when it comes to electronics.

Do you have a link to something that would work.

I saw a set up on eBay but they wanted $70 for it. Ouch.

 

[rallysman]

I'll try to find a schematic, but basically all you do is run a power line to/through the switch and when the switch closes, it will energize a coil which closes a circuit (that handles a higher load).
edit: Best example I could find but replace the batteries with AC.

 

[Bud8Fan]

Thanks, now I just need to find the parts I need.

Is this something I could get at Rat Shack?

 

[rallysman]

I would use something similar to this:

http://www.grainger.com/Grainger/items/2XC22

The shack might have something, but I think they carry mainly ones with low voltage coils.

 

[Bud8Fan]

Cool! Thanks, our plant has an account with Grainger. I'll have to see if my production manager can "order" me one.

 

[rallysman]

With that one being normally open, you'll have to have a switch that will stay closed until the water level gets too low. Once the switch opens, it will break the connection on your pump power side and kill the pump. I would order 2 to have a backup because if the relay fails your pump will too (or you could install a manual bypass switch).