I have one side of a 125VAC panel-mount indicator connected to the AC load points of a solid state relay. The control points are hooked to a microcontroller with a basic program that switches the indicator on and off depending on characters that arrive on the UART.
The problem is that even when no voltage is applied to the control points, the indicator light still glows dimly. When I engage the control points, the indicator lights up brightly.
At first I thought the SSR had failed, so I ordered another one from a completely different company, but it's doing the exact same thing. Is it just a coincidence that I got two broken SSRs in a row from different manufacturers or (more likely) am I doing something wrong?
EDIT: Here are the SSRs I've tried.
- ECE ESR5102401000 24-240VAC/10A 3-32VDC
- SHZHE SSR-25DA 24-380VAC/25A 3-32VDC