Overload relay

From International Dictionary of Marine Aids to Navigation
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A relay that operates at a preset value of overload.

Note: An overload relay is usually made to respond to current, but the response may be to power, temperature, etc.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM