katkaisijalaite

A katkaisijalaite, often translated as a disconnector or isolation switch, is an electrical switching device used in power systems. Its primary function is to physically separate a circuit or part of a circuit from the main power supply. This separation is crucial for safety during maintenance, repair, or inspection of electrical equipment. Unlike circuit breakers, disconnectors are not designed to interrupt fault currents. They are operated only when the circuit is de-energized, or under very light load conditions.

Disconnectors are typically installed in series with other protective devices like circuit breakers. They provide a visible break in the circuit, ensuring that personnel working on the downstream equipment are not exposed to live voltage. This visible gap is a key safety feature. They are commonly found in high-voltage substations and in industrial power distribution systems.

The operation of a disconnector can be manual or motorized. Manual operation usually involves a lever or crank mechanism, while motorized versions allow for remote control. Safety interlocks are often incorporated to prevent accidental operation or to ensure that other switching devices are in the correct position before the disconnector can be operated. Proper use of disconnectors is a fundamental aspect of electrical safety protocols.