Re: What is this? MS? Volt Reducer?
Click on his photo. It is NOT an SCR. It's an electro-mechanical device, NOT a semiconductor.
With most attached photos, you click once to get a preview, click again and it will open in a new window, click a third time and it will zoom to full size.
If you look closely, you'll see it has a coil and core, and a piece mounted on flexible steel with what are clearly contacts. It's either a buzzer or a vibrator, which mechanically are the same.
EDIT: electrically, a vibrator may more than one sets of contacts, so the coil doesn't have to be rated to handle the full load.
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