Selecting Thermal Overload Relays for Motor Starters
The post explains the critical functions of an electrical motor starter, including starting the motor and ensuring protection against overload and phase failures. It emphasizes the importance of correctly selecting contactor and thermal overload relay ratings based on motor specifications, detailing how the overload relay operates to prevent motor damage during varying load conditions.
What's inside Thermal Overload Relay | Type MK1 By L&T
The primary role of a starter, particularly in DOL and Star-Delta configurations, is to safeguard motors against overload and phase loss, utilizing thermal overload relays. These relays monitor current through bimetallic strips to trip control circuits under fault conditions, preventing motor damage by interrupting power to the contactor when necessary.