Yes that is correct. This of course is a vital protection when cable is passed beneath floorboards. As a plus, if you ever need to expose or work on the connector in the bed, the breakers can be manually clicked off.
And a tip, the electrical studs on the breakers is 1/4". Extremely heavy cable needs to have strain relief support a few inches away from the studs. Clamp down the wires tight then flex them by hand to achieve near zero pull force on the studs. I use bronze or stainless flat washers on top of the terminal to achieve better fit.