Supco SUPR Universal Potential Relay, Single Phase, 110 - 270 Operating Voltage, 30 A Load Current

Great cost fit perfect

Revived a dead York home AC unit. The numbered terminals are universal and matched my exsisting Potential relay but I did google it to make sure. It included extra electrical terminals so I would have been covered if one was lost. Works great. Its been over a month and still running great.

It worked well in the repair of an older bench grinder

I bought a surplus 743 RPM 115 Volt AC Inline Gearmotor several years ago but couldn't find a relay that would work with it. I resorted to using a 3 way DPDT toggle switch. I would flip the switch to one position to start the motor and another to remove the start capacitor. This worked but it was a huge kluge. This relay uses a timer to remove the start capacitor. The motor makes an awful noise when it starts but, hey, it starts!

My problem: how can I reliably run 3-phase 230VAC equipment on 1-phase power supply. This potential relay solved my headache. Unable to find this type relay in Europe.Wiring was easy. Youtube videos showed me how to configure and wire capacitors, run and start. Note - when operating 3-phase equipment on 1-pase you only get 2/3 of the rated power. This works fine as long as you factor in your power requirements. Happy woodworker in Norway.

As described

I bought two of these potential relays, and they both failed in just a couple days.At first, I thought it up the compressor wasn’t producing enough back EMF to keep the relay open, but after the first one failed, I decided to check before replacing it again.The second relay had the same issue only lasted a couple days. I replaced it with a different brand, and it’s been good ever since.I’m just glad the fridge compressor had a thermal overload switch cause this relay would have just fried the starting coils or started a fire.

It fit my application and works good