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Most likely your load is DC and your SSR controls AC loads. If so, the SSR will only be capable to turn it on but not off, because AC SSR uses zero-crossing to trigger its internal TRIAC but DC loads rarely crosses zero.
Tools + Supplies
Welcome to CNC
LEDs and Lighting Class
Convert an ATX PSU Into a Bench PSU that Measures Current
How to Make a Three Axis CNC Machine (Cheaply and Easily)
How to build an Arcade Machine in 4 minutes
Fading RGB LED (Arduino)