Switch (Trigger)
Definition
Closes the firing circuit. Time-delay, command-wired, radio-controlled (RCIED), or victim-operated (pressure plate, tripwire, anti-handling).
- Function
- Closes the firing circuit of an IED
- Timed type
- Time-delay switch
- Remote type
- Command-wire or radio-controlled (RCIED)
- Victim-operated types
- Pressure plate, tripwire, anti-handling switch
- Examination focus
- Circuit path, power source, and switch mechanism
Common questions
Why does the switch type matter for a post-blast forensic reconstruction?+
The switch type indicates the intended trigger method and, for a victim-operated device, whether the target was meant to be indiscriminate (tripwire, pressure plate) or specific (command-wire, radio), which shapes both the investigative lead set and the safety protocol for scene clearance.
What is an anti-handling switch and why is it treated as a separate hazard?+
It is a secondary switch designed to trigger detonation if the device is moved, disturbed, or tampered with, intended to injure the person attempting to disarm or remove it. Its presence means render-safe procedures must assume a booby-trap layer beyond the primary trigger.
How can examiners distinguish a command-wire from a radio-controlled trigger after detonation?+
Command-wire devices leave physical wire remnants running from the device toward a firing point, while RCIED remains show a receiver module and antenna fragments; recovered circuit components and any surviving wire runs are key physical evidence for this distinction.
Related terms
- Country-Made Bomb (Desi / Sutli Bomb)
- Hand-thrown device built around KClO3 plus sulphur (or KNO3 plus S plus C, or amorphous P plus KClO3), wrapped in jute, paper...
- Four-Component IED Model
- Initiator, main charge, switch (trigger), power source. Plus the container or casing that confines the blast and supplies shrapnel. Every IED maps...
- IED (Improvised Explosive Device)
- Any explosive device built outside the military or commercial supply chain. The explosive, the trigger or the casing (often all three) is...
- Initiator
- Starts the explosive train: blasting cap or detonator (electric or non-electric), safety fuse, nitrocellulose fuse, or shock tube.
- Main Charge
- The bulk explosive. Low explosive (black powder, KClO3 mixtures) for desi bombs; high explosive (RDX, TNT, PETN, ANFO) for pressure-cooker, tiffin and...
- Render-Safe Procedure (RSP)
- NSG / state BDS actions to neutralise a suspect device without detonating it. Tools: disruptors (water-cannon, PAN), portable X-ray, robots (DRDO Daksh,...
- VBIED / SBBIED
- Vehicle-Borne IED (truck, car, scooter) and Suicide Bomber-Borne IED (belt, vest, body-worn). Pulwama 2019 was a VBIED; Rajiv Gandhi 1991 was an...