They work, but really weak. They cannot handle the voltage surges of twin coil switch machines like NJI's. Thats why SC-2's were developed. For SC-1's to work correctly without frying in a high amp situation, you have to use them to fire a relay.
Its been a while since I had to remember their limitations. I'm sure GRJ can better explain their problems.
My advice is to keep looking for SC-2's
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