The M624 fuze consists of the M607 fuze connected to an adaptor which is loaded with a delay element. The adaptor is designed to screw into the mine fuze well. The M624 fuze incorporates a belleville spring-loaded firing pin, a tilt rod, a pressure ring, and a frangible plastic collar. A safety band and stop prevents movement of the fuze pressure ring. This is secured with a safety pin.
Fuze M624 is a pressure type fuze that can also be activated by side thrust loads, when so adapted, by the addition of an extension rod. The plastic collar within the fuze is designed to shatter under vertical loading of the pressure ring, or from side load effects on the tilt rod. A 290 pound vertical load with 1/8-inch travel, or a horizontal force on the tilt rod greater than 3.75 pounds acting through approximately 20 degrees, is required to shatter the plastic collar. Once the collar is broken, continuing force from either source will be transmitted through the tilt rod to the belleville spring, which will drive the firing pin into the PA523 detonator. This will activate the delay element which in turn will initiate the mine.