This explosive is quite useful for most cases like scienfist, rager, and panzer. Mostly due to the fact that it produces 3 and each one can explode 3 times (indicated by number of red lights on mine). So if there a zombie bosses following you, you can just walk around the mine and they'll eventally go near it and it will explode (takes at least 3 or more seconds after the first explosion for other explosions of the mine to activate).
But if you are trapped at a dead end and a kamikaze is after you and you dont have any grenades, you're pretty much screwed if your weapon has a low damage rate. But if you planted it ahead of time hope your weapon will have enough damage to stagger it near the mine for other explosions.
Just a tip for new players or players playing on hard mode.