Exploder

A device to trigger explosions in torpedoes.A device designed to generate an electric current in a firing circuit after deliberate action by the user in order to initiate an explosive charge or charges.In addition, an exploder will have safety and arming mechanisms that protect users from premature or accidental detonation. For example, an artillery exploder’s battery is activated by the high acceleration of cannon launch, and the exploder must be spinning rapidly before it will function. "Complete bore safety" can be achieved with mechanical shutters that isolate the detonator from the main charge until the shell is fired. (American Heritage Dictionary of the English Language, Fifth Edition.
Copyright 2016 by Houghton Mifflin Harcourt Publishing Company.)
The earliest known use of the noun exploder is in the mid 1600s.
OED's earliest evidence for exploder is from 1659, in the writing of Henry More, philosopher, poet, and theologian. (Oxford English Dictionary revised 2016)