A current overload relay (COR) is a critical component in electrical protection systems, primarily designed to prevent damage to electrical circuits due to excessive current. It serves as a safeguard, ensuring that electrical devices and equipment operate within their specified limits. When an electrical current exceeds a preset value, the overload relay trips, disconnecting the circuit to avoid overheating, potential fire hazards, or equipment failure. This article delves into the role, working principle, types, and applications of current overload relays in modern electrical systems.
The Role of Current Overload Relay In any electrical circuit, especially in industrial and commercial settings, devices like motors, transformers, and other machinery are prone to excessive current surges. These surges can result from short circuits, overload conditions, or external faults. Without protection, this excess current can lead to the overheating of conductors, insulation breakdown, and eventual damage to expensive equipment. The current overload relay is specifically designed to detect these excess currents and take protective actions by breaking the circuit. This is essential for preventing the cascade of failures in the electrical system, ensuring safety, and prolonging the lifespan of the equipment.
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