What is the first step to reset a thermal overload relay after it has tripped?

The first step to reset a thermal overload relay after it has tripped is to check for resolved overload conditions. This step is crucial because a thermal overload relay is designed to protect motors by deactivating them when they encounter excessive heat due to overload. Before resetting the relay, it's essential to investigate the cause of the trip to ensure that the issue has been addressed.

By confirming that the overload condition has been resolved—such as checking for mechanical binding, ensuring proper voltage levels, or verifying that the motor is not overloaded—you can safely reset the relay without risking damage to the motor or creating unsafe operating conditions. This approach helps maintain the integrity of the motor protection system and prevents repeated trips that could indicate an ongoing problem.

While other options may seem relevant, they do not address the immediate needs of assessing system safety Post-tripping, which is vital for effective motor protection operations. For instance, resetting the relay without checking for the underlying issue could lead to repeated failures or worse damage to the equipment.