If there is any possibility of a dangerous condition being created by the motor starting randomly then AUTO reset should not be used. Before using AUTO reset, you must consider the potential consequences and dangers of the motor restarting at an unknown time. Usually, AUTO reset is only used in cases where the motor is remote, and not monitored by any human on a regular basis.
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Auto Reset vs Manual Reset on Thermal Overload Relaysįrom a safety perspective, it’s easy to see how AUTO reset can be dangerous and should only be used in certain situations. Because the cooling rate of the overload is variable and not easily predicted, this means the motor can and will restart at any time without warning. It does not require any outside intervention to restart the motor. Auto ResetĪUTO reset means that once the bi-metal strip inside the overload relay cools and makes contact again, the motor will restart automatically.
Ambient temperature, airflow, sunlight can all affect how quickly the overload cools. How long it takes for the overload to cool depends on many factors. It’s important to note, the motor will only restart once the overload relay has cooled enough to restore contact inside the overload relay. This can be a human operator pressing a start button, or an external switch sending power to the contactor coil. MANUAL reset means that once the overload trips, it will require outside intervention to restart the motor. The overload in the photo is currently set to MANUAL. This knob controls how the overload will be reset. In the photo below you can see a blue knob that’s been circled:
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The thermal overload has two ways it can be restarted, and this is a question we receive a lot from our customers, and there seems to be some confusion about how to decide. You can read our previous blog posts on motor starters to learn more:Īfter the thermal overload heats up and breaks contact to stop the motor, eventually you are going to want to restart the motor. more than the rated full load amperage of the motor at the given voltage. The overload is there to prevent damage to the motor if the motor starts drawing too much current, i.e. The contactor is there to act as the switch and transmit power to the motor. Home » About Us » News » Automatic vs Manual Reset on Thermal Overload Automatic vs Manual Reset on Thermal OverloadĪ thermal overload, sometimes called a thermal overload relay, is an essential part of a motor starter.
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