Thermal protectors are in high demand these days. Thermal protection is very important since overheating of a motor can result in equipment failure, costly repairs, and even injuries to personnel. A motor thermal protection switch is a special device that is designed to prevent motor overheating. It uses accurate temperature sensors and a reliable mechanism to instantly shut off the motor when it overheats. In this way, it prevents equipment failure or damage.
Types of Motor Thermal Protection Switches
There are several different types of motor thermal protection switches. The most popular types include the following:
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Bimetal Thermal Switch
A bimetal thermal switch is typically made of two metals that are bonded together. Both metals have different coefficients of thermal expansion, and this is what this switch operates around. When the temperature threshold is reached, the snap action of the metals forces the switch to trip the mechanism.
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Thermal Reed Switches
Thermal reed switches contain a pair of contacts on hermetically sealed ferrous metal reeds. The magnetic field actuates these contacts, opening or closing them when a soft, temperature-sensing ferromagnetic substance reaches its curie point.
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Mercury Switches
These thermal switches use contacts that are sealed in a glass envelope containing a tiny amount of mercury. Because of thermal expansion, mercury makes or breaks the contacts, and the movement in the metal coil actuates the high-temperature cutoff switch.
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Other Types
Other varieties of motor thermal protection switches include rod and tube thermal switches, gas-actuated thermal switches, and more.
The Benefits of Using a Motor Thermal Protection Switch
There are many benefits of using a motor thermal protection switch:
ü Automatically shutting off the motor to prevent damage due to overheating
ü Automatic turn-on function after the unit’s temperature falls
ü Cost-effective solution to protecting an equipment
ü Reduces the risk of injury to personnel operating the equipment
ü Suitable for a wide range of electrical devices/appliances
Thermal Protection Switch Installation Tips
There are several different installation methods for a motor thermal protection switch. The method you choose depends on the type of switch. The most common installation methods include the following:
- Installing inside the motor
- Installing outside the motor
- Built into windings
- Built into the terminal box
- Installing on the machine control panel
- Installing on the wall of the power distribution board
Product Recommendation
A motor thermal protection switch offers many advantages, but not all products feature the same quality in this category. That’s why you must buy the thermal protector switch from a reputed brand. Saftty is a renowned manufacturer of thermal protection solutions that are suitable for a variety of electrical equipment. ST11 from Saftty is a recommended product because of these advantages and features:
ü Well-sealed design and stable, consistent performance
ü The small size of the product makes it suitable for installation inside the motor coil
ü Very high-temperature sensitivity and thermal conductivity
ü Accurate temperature control thanks to high-quality bimetal-disc mechanism
ü Fast response and long operational life
ü TUV, UL, CQC certified
ü Suitable for a variety of electrical devices/appliances, e.g., coils, transformers, motors, etc.
Wrapping Up
Using a motor thermal protection switch is an excellent way to prevent equipment damage or failure due to high operating temperatures. For the best results, buying from a seasoned manufacturer is recommended. Saftty specializes in manufacturing all kinds of thermal protector products that cover a wide range of applications.
Established in 2008, Saftty offers certified thermal protectors that feature premium-quality components, robust designs, high thermal conductivity, and stable and consistent performance. The brand is dedicated and committed to offering these safe products at reasonable pricing. You can learn more about the company by visiting its website.
