Pulling the sheet down on the trigger trips the pawls and releases the sheet.
The Nash 418 Trigger cleat allows easy release of highly-loaded lines with complete control. Pulling the line down on the trigger mechanism opens the cleat. The line never comes off the cleat. The trigger serves as a snubbing surface to control release.
In light air, or once the trigger releases the load, the cleat operates like a normal cam cleat. The Trigger cleat is constructed of rugged stainless steel. It is very reliable in heavy air.
Trigger cleats are ideal on highly loaded systems like mainsheets, vangs, and even for some halyards. They have developed a cult-like following in some classes where the crew loves the ability to spill the mainsail reliably during close-quarters maneuvering.