Katkaisijalaitteet

Katkaisijalaitteet, known in English as disconnectors or isolators, are electrical devices used to ensure safety by isolating electrical equipment from the power supply. They are designed to be operated when there is no current flowing through the circuit, or at least a very minimal current, such as when no load is connected. This is a crucial distinction from circuit breakers, which are designed to interrupt current under fault conditions.

The primary function of a katkaisijalaite is to provide a visible and reliable air gap, confirming that the circuit is indeed open and de-energized. This visible break is essential for personnel safety during maintenance or repair work on electrical systems. By physically separating the conductors, it prevents accidental re-energization and protects workers from electric shock.

Katkaisijalaitteet are commonly found in high-voltage substations and power distribution networks. They are typically installed in series with other switching devices like circuit breakers. Their operation is usually manual, although some can be motorized. They are characterized by their robust construction, designed to withstand the harsh environmental conditions often present in outdoor installations.

In essence, katkaisijalaitteet are fundamental safety components in electrical power systems, providing a means to physically disconnect and isolate electrical equipment, thereby ensuring the safety of personnel and the integrity of the system.