Which component is responsible for triggering an IED?

The component responsible for triggering an improvised explosive device (IED) is the switch. The switch is crucial because it acts as the mechanism that activates the explosive device when a certain condition is met, such as the presence of a person, vehicle, or remote signal.

When the switch is engaged, it completes the circuit between the power source and the main charge, allowing the energy from the power source to ignite the explosive material. This can occur through various types of switches, including pressure switches, pull switches, or electronic triggers.

In contrast, the other components play supportive or different roles. The container holds the main charge and other components but does not initiate the explosion. The power source provides the electrical energy needed for the detonation but is also inactive without the switch. Lastly, the main charge refers to the explosive material itself, which remains inert until triggered. The switch is thus the critical component that actively facilitates the initiation of the explosive reaction.