Which of the following statements with regard to fuses are correct ?

1. Fuses are simple switches required to activate an explosive device

2. The three main types of fuses are time delay, physical action, and environment

3. Good example of time delay fuses are chemical pencils

Select the correct answer using the code given below :

In the context of explosives and munitions, a fuse (often spelled 'fuze' in military terminology) is the device used to initiate an explosive train. It functions as a specialized switch that triggers the detonation.

• Statement 1 is correct: Fuses act as the initiation mechanism or switch required to activate an explosive device.
• Statement 2 is correct: Fuses are generally classified based on their triggering stimuli: Time delay (using mechanical, electronic, or chemical timers), Physical action (triggered by impact, percussion, or pressure), and Environment (triggered by external factors like hydrostatic pressure, barometric pressure, or proximity).
• Statement 3 is correct: Chemical pencils (also known as time pencils) are a well-known type of time-delay fuse. They operate via a chemical reaction where an acid corrodes a restraining wire, which eventually snaps to release a spring-loaded firing pin.