Which device interrupts current to protect against overcurrent conditions?

Which device interrupts current to protect against overcurrent conditions?

• A. Fuses and breakers
• B. GFCI outlets
• C. Isolation transformers
• D. Capacitors

Answer: (A)

Overcurrent protection relies on devices that automatically stop current when it rises above a safe level, preventing overheating and damage. Fuses and circuit breakers are designed for this exact purpose: a fuse melts its element when current is too high, opening the circuit, while a breaker trips (electrically or magnetically) to interrupt the current and can be reset after the fault is cleared. GFCI outlets focus on detecting ground faults by monitoring the imbalance between hot and neutral and mainly protect people from shocks, not overcurrent in the circuit. Isolation transformers provide electrical isolation and voltage transformation, not protective interruption. Capacitors store energy and can affect inrush or power factor, but they don’t interrupt current to protect equipment.

Overcurrent protection relies on devices that automatically stop current when it rises above a safe level, preventing overheating and damage. Fuses and circuit breakers are designed for this exact purpose: a fuse melts its element when current is too high, opening the circuit, while a breaker trips (electrically or magnetically) to interrupt the current and can be reset after the fault is cleared. GFCI outlets focus on detecting ground faults by monitoring the imbalance between hot and neutral and mainly protect people from shocks, not overcurrent in the circuit. Isolation transformers provide electrical isolation and voltage transformation, not protective interruption. Capacitors store energy and can affect inrush or power factor, but they don’t interrupt current to protect equipment.