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Thermal overloads detected by digital relays are not really a result of high temperature. The cause is the motor current exceeding the normal motor current and service factor settings, which is then tracked
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Home / Why do thermal relay protectors sometimes fail
Common causes include poor contact alignment, open coils, and improper relay selection for the application. There are several reasons why a relay may fail, including: Excessive current or voltage: A relay may fail if it is exposed to excessive current or voltage, which can burn out the contacts or damage the coil. Mechanical wear and tear: Relays that are used frequently can experience mechanical wear. But what if the thermal overload relay fails? Next we will troubleshoot the thermal overload relay.
