Which component is primarily used for interrupting overcurrent events in an electrical system?

The component that is primarily used for interrupting overcurrent events in an electrical system is a fuse. Fuses are safety devices designed to protect electrical circuits by melting and breaking the circuit when current exceeds a predetermined level. This prevents damage to equipment, fire hazards, and potential safety issues arising from overcurrent.

Fuses work by having a thin strip of metal that can withstand regular current levels, but when an overcurrent situation occurs, the heat generated causes it to melt. This quick interruption of the electrical flow effectively protects downstream components from damage and ensures safety in the overall system.

Other components listed, such as contactors and relays, are used to control electrical currents but do not provide the same level of overcurrent protection. Contactors are designed to switch electrical loads on and off, while relays perform similar functions based on control signals. Transformers, on the other hand, are utilized to either step up or step down voltage levels in a circuit rather than interrupting currents.