I’ve built a k8056 kit and am switching 240volt AC inputs to turn on and off 8 PSUs of 8 external USB hard drive enclosures. The power usage of the enclosures is less than 3amps.
The problem I have though is that a couple of the relays are sticking in the on position - even when I turn off the 240volt source. To free them I’ve had to remove the relays covers and tap the switch - then they spring back to normal.
Is there anything that I can do to stop this happening - or have I got faulty relays ?