Final answer:
A detonating connector relay is an engineering device used in demolition and mining to control the timing and sequence of explosions for safety and effectiveness.
Step-by-step explanation:
A detonating connector relay is a device commonly used in the fields of demolition and mining to control the sequence and timing of explosions. Relays of this type ensure that charges detonate at precise intervals, which is critical for safety and effectiveness in blasting operations. Specifically, a detonating connector relay serves as the intermediate between the blasting machine and the explosive charges, safely distributing the detonation signal to multiple blasting circuits. The exact function of relay can vary depending on its design, but typically it carries out the critical task of timing the detonations in a sequence set by the blaster.