🔍 Key Concepts

• Overload relay purpose in a motor starter (protects the motor from too much current, not used for switching on/off like a contactor) • Physical features of a thermal overload relay (trip-current adjustment dial, RESET button, and three load terminals that connect in series with the motor leads) • How an overload relay assembly is usually mounted in relation to a contactor (often plugs onto or bolts under the contactor rather than having a large coil and main contacts)

💭 Think About

• Which picture shows a device whose main job is protection (sensing current and tripping), rather than heavy-duty switching of power? • Look for small knobs/dials for current setting and a RESET button— which of the pictures has those features most clearly without a large moving contact structure? • In a typical motor starter, where is the overload relay located in relation to the contactor, and which picture matches that typical size and shape?

✅ Before You Answer

• Verify which option has an adjustable trip setting dial or scale marked in amperes for motor full-load current. • Check which picture shows three heater/relay elements in series with the motor lines, often with screw terminals labeled T1, T2, T3 or similar. • Confirm that the chosen device does not primarily feature a large electromagnetic coil and main power contacts like a standard contactor.