self-destruct system; automatic detonator; self-detonating device
Refers to a mechanism that causes a device, vehicle, or weapon to destroy itself, often used in military, sci-fi, or security contexts.
The enemy base was rigged with a self-destruct system.
If this robot is captured, its self-detonating device activates.
自爆 means 'self-destruction' or 'suicide bombing' as an action; 自爆装置 is the device or system that carries it out.
起爆装置 is a general detonator, not necessarily self-triggered; 自爆装置 specifically implies automatic or self-destruction.
Compound of 自爆 (self-destruction) + 装置 (device, apparatus).