[Ermin]

I have two float switches to control top-off level in my sump. One is for the actual level to start the refill pump. The second is a backup to cut the circuit in case the first float switch gets stuck.

After using the setup for several months, both switches failed together causing a small overflow.

I hooked up a powerhead directly to the float switch running off AC current. The plastic float switch is rated for 15A purchased from Grainger. However, I've heard that this is not safe at all, supposedly, the float switch can't handle direct AC current and will get stuck. Is this true?

How do I hook up a relay to the circuit to make the system "low voltage"?

Also, I want to add a timer relay to the circuit. In case both flow switches fail again, I want the timer to only permit refilling for 5 minute and delay the pump from continuous operation. I know there are timer relays used in air conditioning units. Those relays prevent the AC compressors from flipping on/off constantly. Any suggestion for a cheaper solution?

Thanks in advance.