Voltage Sensitive Relay (VSR)

Marsoni

M251S

$36.95

Get it in 3 business days with 1 day shipping. Friday, May 29

Voltage Sensitive Relay (VSR)VSR (Voltage Sensitive Relay) or ACR (Automatic Charging Relay) are automatically controlled switches that allow two batteries to be combined when charging, and to be isolated when not charging and current is draining from one of the batteries. When used with battery switches, a VSR helps to reserve a fully charged battery at all time, avoiding a dead battery at sea. Features Automatically combines two batteries when charging and isolates the two

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The plates have a tiny amount of twist in the center and quite a bit of doming when flexed. While the outer edges are entirely floppy. Most of the center is smooth, but there are rough patches that flake off paper pieces when rubbed with a spoon or from a lot of moisture from food. The flat surface (not the inner walls) was able to withstand still water for about 10 minutes before weakening, so I wouldn't use it for wet or very moist foods.

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Reviewed in the United States on May 28, 2026