Types and applications of bimetal thermal protector switches

Bimetal thermal switches (KSD9700, KSD301, 7JESTEM, 17AMC, 7JESTEM, 8CM, 8CML, 9700K, 6AP, 8JESTEM, 2JESTEM, 3poseł, 15JESTEM, YS11, MA10, 2MM, AIRPAX thermal protector, JUC-31F , S01, S06) are commonly used in a variety of applications, such as Hair Dryers, Electric Fan Heaters, Popcorn Machines, Electric Ovens, Dish Dryers, refrigerators etc. They are also commonly used in HVAC systems to ensure that the temperature remains within a certain range. There are several basic types of thermal switches and thermal protectors: bi-metal disc or snap action, thermal reed switch.

KSD9700/9700K Motor 10A/5A Overheating Protector

BW Thermal protector switches n.c. resets automatically with cables

17AM Snap-Action, Self-Hold Thermostat

Thermal Switches and Thermal Protectors Types
Bimetallic disc or snap action switches operate due to the phenomenon of thermal expansion. Two dissimilar metals expand at different rates and when the temperature threshold is reached the discs’ snap action forces the switch to activate.
Thermal reed switches consist of a pair of contacts on ferrous metal reeds which are hermetically sealed. They are actuated by a magnetic field. The contacts may be normally open or normally closed and change state when a ferromagnetic substance reaches its curie point and alters the magnetic field surrounding the reed switch.
Gas-actuated, also referred to as vapor-tension, thermal switches use the thermal expansion of a gas or vapor in a sensing bulb to create a proportional pressure on a diaphragm or piston assembly that actuates the electrical switching element.

Application Cases of Bimetal Temperature Switches on Oil Pump Motors:
In the field of industrial automation, oil pump motors are one of the common devices and are widely used in various mechanical systems. However, due to the complex operating environment of oil pump motors, they often face risks such as overheating. In order to ensure the safe and stable operation of oil pump motors, it is particularly important to select an efficient and reliable motor protector. This article will introduce the application cases of bimetal thermal protectors on oil pump motors and analyze their advantages and effects in practical applications.

2. Principles and Features of Bimetal Temperature Switches

Bimetal temperature switches are an overheating protection device based on temperature sensitive elements. When the motor temperature exceeds the preset value, the bimetallic strip inside the thermal protector will deform, triggering the protection action, cutting off the power supply or reducing the current, thereby preventing the motor from overheating and burning. Bimetallic thermal protectors have the advantages of simple structure, rapid response and high reliability, so they are widely used in the field of motor protection.

3. Application case analysis
The hydraulic system of a factory uses oil pump motor as the power source. In order to ensure the stable operation of the system, a bimetallic thermal protector is selected as the motor overheat protection device. The following is a specific analysis of the case:

Scheme design
In the hydraulic system, the oil pump motor works in a high temperature and high humidity environment for a long time, and it is easy to overheat. In order to effectively prevent the motor from overheating and burning, a bimetallic thermal protector is selected as the motor overheat protection device. When designing the scheme, according to the rated power, working current and other parameters of the motor, select the thermal protector of appropriate specifications and install it on the power supply line of the motor.

Installation and commissioning
When installing a bimetallic thermal protector, certain steps and precautions must be followed. First, ensure that the wiring of the motor is correct and firm to prevent overheating caused by poor wiring. Secondly, according to the installation instructions of the thermal protector, install it on the power supply line of the motor, and ensure that the connection is tight and the conductivity is good. Finally, adjust the setting value of the thermal protector to match the normal working temperature of the motor. After the installation is completed, the system is debugged to ensure the normal operation of the hydraulic system.

Operation monitoring and effect evaluation
During the operation of the oil pump motor, the bimetallic thermal protector monitors the temperature changes of the motor in real time. When the motor temperature exceeds the set value, the thermal protector quickly cuts off the power supply or reduces the current to prevent the motor from overheating and burning. At the same time, the system can be equipped with a temperature monitoring instrument to display the working temperature of the motor in real time, so that the operator can find abnormal conditions in time. After a period of operation monitoring and effect evaluation, the hydraulic system operates stably and reliably, effectively avoiding the failure problems caused by motor overheating.

1/2″ Disc-Type Thermostat thermal protector switches

Automatic Reset Moisture Resistant SPST Disc Thermostats

Automatic Reset Phenolic Thermostat (Low Profile)

IV. Conclusion
Through the above case analysis, it can be seen that the application of bimetallic thermal protector on oil pump motor has significant advantages and effects. It can monitor the temperature changes of the motor in real time, and quickly cut off the power supply or reduce the current when overheating, effectively preventing the motor from burning. In addition, the bimetallic thermal protector has a simple structure, rapid response, and high reliability, which can meet the safe and stable operation requirements of the oil pump motor in complex environments. In practical applications, selecting a suitable bimetallic thermal protector and installing and debugging it reasonably is of great significance to ensure the safety of the oil pump motor and extend its service life.

THERMAL SWITCHE OPEN TEMP & ZRESETUJ TEMP