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How Work Of Thermal Overload Protectors

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How Work Of Thermal Overload Protectors

How Work Of Thermal Overload Protectors

The L&G ELECTRONICS 17AMI Thermal Overload Protectors have automatic reset and manual reset.Mainly realize temperature control disconnection and current overload lock-rotor protection disconnection.

1,17AMI series is a normally closed temperature automatic reset type.65-165C Temperature range selection

2,17AMIOP is a normally closed temperature manual reset. 65-165C Temperature range selection

3,17AMIRP is a dual protection type for temperature and current locked rotor.65-165C Temperature range selection and 4-40A Motor stall current 3-20 second protection time.This model is mainly used for motor products such as automobile motors, snow plows, juicers, water pumps, weeding machines, etc.

The thermal protector consists of one or more heat-sensing elements built into the motor or motor-compressor, plus an external control device. The thermal protection is present to turn the motor off when excessive heat is generated within the motor circuitry. This safety feature halts the temperature climb before it can burn up the motor.

Thermal protectors generally reset themselves once the motor cools down to a safe operating temperature.17AM thermal protector the reset happens automatically as the motor cools.


Having a motor shut down because it tripped a thermal limit device is inconvenient, but it certainly is better than having to replace a motor because it overheats. And the shut-down can alert you to problems with the motor or connected devices, or to the load attached to the motor. When a motor fails to start or overheats during operation, it may indicate that the motor has reached the end of its useful life and must be replaced. But often the fault does not lie with the motor at all. For example, there may be an obstruction on the load attached to the motor, leading to excessive load that causes heat to build up in the motor.

Examples of Motors With Thermal Protectors

A sump pump is a motor for which this scenario often occurs. If a sump pump pumps water filled with debris, pieces of debris may get caught in the impeller and lock the rotation of the pump motor, causing it to overheat very quickly. On a pump equipped with thermal protection, the device will trip and shut down the electrical flow to the motor windings. This will allow the motor to cool down and may well save it from complete failure. Alerted to the problem because the motor shuts down, you may be able to clear the impeller and keep your sump pump motor operating for quite some time before it needs replacing.

What Are the Motor Windings?

Motor windings are wires within a motor that carry the electrical current. The windings are placed in coils and typically wrapped around an iron magnetic core, which forms magnetic poles when the current energizes it.

The same scenario may be true on other electric motors that process variable loads, such as garbage disposers, washing machines or vacuum cleaners. Without thermal protection, such motors can be more prone to burn-out.

Thermal protection is generally a good feature to look for when buying equipment with electrical motors. By protecting the motor from overheating, it can greatly extend the life of the motor.


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L&G ELECTRONIC CO.,LTD. factory in China mainland was established in 2007 and the HongKong office Was established in 2014. We turned into a manufacturer engaged in the R&D, manufacture and trading companyof Switches, Thermalprotector, Potentiometer ,rotary rheostat and jacks.
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