The Science Behind Relay Contact Wear Under Repeated Switching
248.00 $
Published date: 2025/10/08
- Location: 5350, Manley Hot Springs, Louisiana, United States
Relay contacts are vital components in industrial control circuits, responsible for making and breaking current flow in circuits. Over time, during repeated switching operations, these contacts deteriorate due to cyclical mechanical stress. This degradation is known as contact surface degradation and can significantly impact system reliability and performance.
When a relay switches on or off, a plasma discharge may occur between the contacts, under inductive or lagging power factor conditions. This arc creates thermal stress that causes material transfer between the contacts, leading to crater formation on one surface and انواع رله mound development on the opposite. Over thousands or millions of cycles, this erosion modifies the microstructure, diminishing electrical efficiency.
In addition to arcing, physical abrasion also contributes to aging.
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