Anti-tank mines
Anti-tank mines are designed to detonate when a heavy vehicle drives over it, such as tanks. AT mines are large - bigger than a person’s shoe - and heavy - weighing over five kilograms. These mines are created with the capability of destroying an armored tank, along with the people inside and around it.
As a tank rolls over the mine, it pushes down on the pressure plate. Underneath the pressure plate is a Belleville spring with a firing pin affixed to its underside. The firing pin is driven down into the detonator, which detonates and fires the M120 booster charge beneath the fuse, which then sets off the main charge. (Kevin Bosner, "How Landmines Work".)