Electrical fault

An abnormal condition in an electrical circuit or system that disrupts its intended operation, such as a short circuit, open circuit, or insulation failure.

Short circuit: An unintended low-resistance path between circuit points at different potentials, causing excessive current. A fault current surges when current bypasses its intended load through this path.
Protective relay: A device that detects abnormal electrical conditions and initiates protective actions, usually by tripping a breaker. Relays identify fault signatures and command isolation of affected equipment.
Electric current: The rate at which electric charge passes a point in a circuit. Faults change current magnitude or interrupt its flow through circuit paths.
Electrical fire: A fire caused or sustained by electrical energy, including overheating, arcing, or ignition of nearby materials. Fault heating and arcs can ignite insulation, wiring, or nearby combustible materials.
Open circuit: A break in a conductive path that prevents current from flowing through the affected circuit. A broken conductor or connection interrupts the circuit without necessarily creating a high current.
Circuit breaker: A resettable switching device that interrupts current when a circuit exceeds specified limits or meets a trip condition. It disconnects circuits when fault current or relay commands exceed its operating criteria.
Voltage: The electrical potential difference between two points, which can drive charge through a circuit. Faults redistribute voltage and can expose components or people to dangerous potentials.
Electric shock: A physiological effect caused when electric current passes through the body. A fault can energize accessible metal or create a hazardous path through a person.
Ground fault: An unintended electrical connection between an energized conductor and earth or grounded equipment. Insulation failure can divert current to grounded metal and create shock or fire hazards.
Fuse: An overcurrent protection device whose element melts to interrupt excessive current. A fuse clears some faults by sacrificing its element and opening the circuit.

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Power system protectionNarrower topic: Protection schemes are designed around the faults that can occur on power networks.