Electronics-Salon 115Vac Mains Power ON Delay Soft-Start Protection Module, with 12 Vdc Regulator.

I used it on a 8 amp freezer compressor and it burned up in a month. The surge (LRA) on start-up was close to 50 amps for a couple of microseconds. The board has 4 NTC 10D-20 current resisters to throttle the amps for an adj time delay and then switch to line power. All 4 NTCs burnt out. I did not adjust the delay time pot and I now realize that this was holding the resisters in the circuit for 4 -6 seconds which is way more than I need. The setting is 1 - 10 seconds and the factory adjustment is set in the middle of the range. I must re-evaluate this.

just a quick note about the 12volt power supply. The device uses a relay that runs on 12 volts to switch the high voltage A.C. current from the wall. The device takes the 120v from the wall, converts it to 12v to run its timer, and open and close the relay. It needs 12volts for it's internal operations to do this. Adding a 12v output for another use at the user's option probably adds about 17 cents to the cost of manufacturing, as a source of 12 volts is already present. I am frankly surprised that anyone purchasing this device would not understand this.

Added this to an Adcom GFA-555ii amp to soft start the amp to save on the components. It works exactly as advertised. The 12V out was a nice bonus as it powered my speaker protection board I was also adding to this amp.Before, this amp would dim the lights on power up while the filter caps were charging with very high inrush current. Now it gently brings the amp up over a few seconds before clicking over to full mains voltage.Exactly as advertised! Would recommend for any design that needs to slow down inrush on power up.

A little disappointed. It is not current sensing, so the protection cycle begins when this module sees power, not the device you have switched on. Thus, you need a second switch before this. And why pay for the un-needed 12V power supply?

1) doesn’t work2) uses NTC device with relay and 555 timer chip3) timer starts immediately upon applying AC power, not when the load is applied

Put in a box mounted it, wired it and works great. Used it in my audio set up. The amp is big and the inrush current is high. I use a UPS because power at my location is unstable, lots of power outages. UPS gives me time to shut down gracefully avoid a big thump that could damage my expensive speakers. But the UPS doesn’t like the inrush current and would trip off. No more problems with this soft start board. Again requires some building skills.