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MC Single-phase Manual Or Automatic Reset Protector
MC Single-phase Manual Or Automatic Reset Protector

MC Single-phase Manual Or Automatic Reset Protector

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
Product Detail

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


Main Advantage

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


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Principle Of Operation

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

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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

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Application Worksheet

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)


Application Worksheet

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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