Categories
Scope Of Application
Inherent protection device for motors ≤2.24kw, suitable for industrial motors, agricultural equipment, deep well pumps, fans, air conditioners, refrigerators and other household appliances, etc.
Safety Certification
UL&CUL：E258861
Product Overview
Take the snap metal sheet as the basic working element, which is very sensitive to temperature and current.
Accurate calibration-calibrate and inspect the temperature under controllable conditions to ensure reliable performance.
Can provide automatic or manual reset series
Easy to install
Why do we need to protect the motor?
Overheating of the motor insulation will cause the dielectric strength to decrease, and further cause damage or failure of the motor insulation. For the following conditions that cause the motor to overheat, Aino motor protectors can be used to provide protection:
Long-term overload operation
Stalled-a mechanical/electrical start failure occurred
Line low voltage
High ambient temperature and insufficient ventilation
Number Naming Reference
Ainol's single-phase manual or automatic reset protector is equipped with a snap-type bimetal, which has contacts on the upper end and can pass current. If there is an overheating condition, the current passing through the Ainol metal sheet will have a heating effect, and the influence of the motor heat will cause the temperature of the bimetal sheet to rise.
When the bimetal reaches the calibration set point, the Aino protector automatically disconnects the power supply to achieve the purpose of limiting the over-temperature of the winding and the casing.
When the motor cools to the allowable working temperature, the protector cools to the reset temperature, the Aino protector automatically resets, and the motor restarts.
For situations where automatic restart may cause equipment or work hazards, Aino protectors can also provide manual reset models.
Technical Parameters
Operating temperature range: 90℃~145℃
Rated voltage: 250V/125V
Overload current trip value selection range: ≤17A
Action time: 5s-15s or customized according to customer requirements
Characteristic Curve
Approximate value-only used to select motor verification test samples
These curves are only used to provide guidance when choosing a protector for a specific application. Other factors should be considered when choosing a protector, such as the distance from the heat source and the installation method. The trip time depends on the terminal configuration and installation conditions.
Installation Method
The protector should be installed inside the motor and can receive the maximum heat generated in the running state or stalled rotor state from the windings. The best installation position depends on the structure of the motor, but generally speaking, this position can be an air cover, an end cover or a stator core.
Wiring Diagram
Motor data
A. Locked-rotor requirements
1. Locked-rotor cold current: the instantaneous current when the motor is turned on.
2. Locked-rotor thermal current: the current at the end of the first cycle test. Usually 10 to 30 seconds after the motor is turned on for the first time.
3. In the above test, the elapsed time when the motor winding temperature rises from room temperature to near the allowable temperature of the UL motor insulation class. For example: For a class A motor, it takes 12.5 seconds to go from 25°C to 175°C.
4. Ambient temperature (°C) during the test: room temperature (usually 25°C).
B. Overload operation requirements
1. Load current: When the motor is running, the load on the motor will increase slightly until the temperature of the motor winding is completely stabilized at about 10°C below the maximum allowable temperature of the UL motor class. For example, for a class A motor, the maximum allowable temperature is 140°C, and the motor winding temperature is at 130°C when the motor winding temperature is completely stable. Record the current loss at this time.
2. Protector position temperature: the temperature measured under the above load conditions when the motor is running.
3. Ambient temperature: room temperature (usually 25°C).
C. Abnormal protection conditions
1. Maximum/minimum ambient temperature: the temperature around the protector.
2. Highest/lowest line voltage: the highest and lowest voltage under the premise of effective protection.
3. Other environmental factors: For example, exposure to agricultural climate conditions.
D nameplate data
1. Power
2. Voltage
3. Single phase
4.FLA (full load current)
5.LRA (locked-rotor current)
6. Insulation class (UL/CSA) (specify a class)
Protector requirements
A. Automatic or manual reset
B. Round or eared base
C. Terminal type
Specified motor data
A. Locked-rotor requirements
1. Locked-rotor cold current
2. Stalled-rotor thermal current
3. The time required for the temperature of the motor winding to rise to the highest temperature
4. Ambient temperature during the test
B. Overload operation requirements
1. The load current when the main winding temperature is completely stable at about 10℃ below the maximum allowable temperature
2. The temperature of the protector position below the surface of the protector
3. The temperature of the protector position above the protector
4. Ambient temperature during the test
C. Abnormal protection conditions
1. Highest/lowest ambient temperature
2. Highest/lowest line voltage
3. Other environmental factors
Note: Aino Technology can provide application support.
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