Low-voltage Pole-mounted Circuit Breaker Incoming And Outgoing Line Connection Inspection

The quality of electrical connections at the incoming and outgoing terminals directly affects the operating performance of Lv Pole Mounted Circuit Breakers. All phase lead connections must be crimped using hydraulic clamps, and the contact resistance must be less than 50 μΩ. If the connections of a low-voltage pole-mounted circuit breaker in operation are not secure, localized overheating may occur, potentially leading to carbonization of the insulation material. During inspection, an infrared thermometer should be used to monitor the temperature of each connection point; any abnormal temperature rise must be addressed immediately.

Inspecting the incoming and outgoing lines of a low-voltage pole-mounted circuit breaker involves several technical aspects. After the line is de-energized, maintenance personnel should observe the terminals for signs of blackening or deformation. During routine inspections, the temperature of the connection points should be carefully checked. During annual maintenance, the main circuit resistance should be measured, and the change should not exceed 20% of the initial value. For exposed conductors, the presence of an oxide layer should be checked; a decrease in metallic luster often indicates contact problems.