What is the primary purpose of a fuse circuit breaker?

The primary purpose of a fuse circuit breaker is to protect against overcurrent. This device is designed to interrupt the flow of electricity when it detects a current that exceeds safe levels. Overcurrent can occur due to overload conditions, short circuits, or other electrical faults. When the current surpasses a predetermined threshold, the fuse element melts or the circuit breaker trips, effectively cutting off power and preventing potential damage to the electrical system, appliances, and reducing the risk of fire hazards. This protective feature is essential in any electrical circuit to ensure safety and reliability.

In contrast, other options focus on different aspects of electrical systems: increasing voltage, decreasing resistance, and stabilizing current are not functions performed by a fuse circuit breaker. These tasks would involve different types of electrical components and designs.