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JCB3LM-80 ELCB Earth Leakage Circuit Breaker Residual Current Operated Circuit Breaker RCBO


JCB3LM-80 ELCB Earth Leakage Circuit Breaker Residual Current Operated Circuit Breaker RCBO

The JCB3LM-80 Series Earth Leakage Circuit Breaker (ELCB) is an important component in maintaining the electrical safety of residential and commercial properties. These devices play a vital role in preventing electrical accidents and property damage by providing leakage protection, overload protection, and short-circuit protection. They are designed to immediately disconnect the power supply in the event of an imbalance or fault, ensuring safe operation of the circuit. This proactive approach to comprehensive protection against overloads, short circuits and earth leakage currents is critical to protecting people and assets. Therefore, proper installation and maintenance of these circuit breakers is critical to ensuring a safe electrical environment.

The JCB3LM-80 Series Earth Leakage Circuit Breakers (ELCB) offer a variety of options to meet various electrical requirements. These circuit breakers are available in current ranges from 6A to 80A to meet different power needs. In addition, the rated residual operating current range is from 0.03A (30mA) to 0.3A (300mA), which can flexibly solve different degrees of electrical imbalance problems. The availability of 1 P+N (1 pole 2 wire), 2 pole, 3 pole, 3P+N (3 pole 4 wire) and 4 pole configurations ensures compatibility with various electrical setups. In addition, the choice between Type A and AC and the breaking capacity of 6kA prove the suitability of these circuit breakers for a variety of electrical systems. Finally, compliance with standards such as IEC61009-1 emphasizes the commitment to meeting industry regulations and ensuring the safety and reliability of these devices.


    The JCB3LM-80 Series Earth Leakage Circuit Breaker (ELCB) is a versatile and critical safety device suitable for a variety of applications, including industrial, commercial, residential and high-rise building environments. It can quickly cut off the fault current in the event of electric shock or excessive leakage current to ensure the protection of people and equipment. Additionally, the use of ELCBs extends to infrequent circuit and motor starting, increasing their usefulness in a variety of electrical scenarios.
    In fact, the JCB3LM-80 ELCB is an important safeguard against ground fault currents, overloads and short circuit currents. It is recommended to install an ELCB on each individual circuit to isolate faults and prevent them from affecting other circuits. When an electrical fault occurs, such as when a wire comes into contact with water or a person is electrocuted, the ELCB detects an imbalance in the circuit and immediately cuts off the power, mitigating further damage or harm.
    The role of the JCB3LM-80 ELCB in preventing electric shock and fire cannot be overstated. By quickly disconnecting power when a fault is detected, these ELCBs significantly reduce the risk of electric shock and potential electrical fires. This is especially important in residential environments, where electrical mishaps can occur due to various factors such as faulty wiring, damaged appliances, or wet conditions.  The JCB3LM-80 ELCB's ability to provide reliable, fast protection highlights its importance in ensuring electrical safety in a variety of environments.
    In addition to protecting individuals and property from electrical hazards, our JCB3LM-80 ELCB also plays a vital role in protecting electrical equipment and appliances. By quickly shutting down power when a fault is detected, these ELCBs prevent equipment damage and help avoid potentially expensive repairs or replacements. This proactive approach not only keeps personnel safe but also protects valuable electrical equipment from harm.
    JCB3LM-80 series ELCB can also be used as an important backup protection for ground fault, direct contact and indirect contact electric shock in low-voltage distribution systems. Its ability to quickly disconnect a circuit in the event of a malfunction not only protects equipment but also reduces the risk of serious injury from sustained electric shock. In addition, ELCB can also prevent fires caused by continuous ground faults due to overcurrent protection devices not operating, further enhancing its role in electrical safety.
    Our ELCBs feature overvoltage protection to protect against overvoltage events caused by grid faults, providing additional security. This comprehensive approach to protection ensures that our JCB3LM-80 ELCB not only reduces the risk of electric shock and fire, but also helps improve the overall resilience and reliability of electrical systems.

    Product Description


    Main Features
    ● Electromagnetic type
    ● Leakage protection
    ● Overload and short circuit protection
    ● Breaking capacity up to 6kA
    ● Rated current up to 80A (6A, 10A, 20A, 25A, 32A, 40A, 50A, 63A, 80A)
    ● Provide B-type and C-type tripping curves
    ● Trip sensitivity: 30mA, 50mA, 75mA, 100mA, 300mA
    ● Available in Type A or AC
    ● 35mm DIN rail installation
    ● Flexible installation, top or bottom line connection can be selected
    ● Comply with IEC 61009-1, EN61009-1
     The JCB3LM-80 series earth leakage circuit breaker (ELCB) expands on the main functions to provide comprehensive functions to ensure strong electrical protection. The electromagnetic design, coupled with leakage, overload and short circuit protection, makes it a versatile and reliable solution for a variety of electrical applications. With breaking capacities up to 6kA and current ratings ranging from 6A to 80A, these ELCBs handle a wide range of electrical loads and fault conditions well.
     In addition, the availability of Type B and Type C trip curves and trip sensitivities from 30mA to 300mA allow precise customization to meet specific circuit requirements.  The choice between Type A or AC further enhances the adaptability of these ELCBs to different electrical environments. Additionally, 35mm DIN rail mounting and installation flexibility, including the option of wiring from top or bottom, provide convenience and ease of installation in a variety of electrical panels and enclosures.
     Additionally, compliance with international standards such as IEC 61009-1 and EN61009-1 underscores the commitment to quality, safety and reliability, ensuring these ELCBs meet stringent industry requirements. Overall, the JCB3LM-80 Series ELCB offers a comprehensive set of features and capabilities, making it a reliable choice for ensuring electrical safety and protection in a variety of applications.

    Technical Data
    ● Standards: IEC 61009-1, EN61009-1
    ● Type: electromagnetic
    ● Type (detected leakage waveform): A or AC to choose from
    ● Number of poles: 1 P+N (1 pole 2 wires), 2 poles, 3 poles, 3P+N (3 poles 4 wires), 4 poles
    ● Rated current: 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A
    ● Rated working voltage: 110V, 230V, 240V~ (1P+N), 400V/415V (3P, 3P+N, 4P)
    ● Rated sensitivity I△n: 30mA, 50mA, 75mA, 100mA, 300mA
    ● Rated breaking capacity: 6kA
    ● Insulation voltage: 500V
    ● Rated frequency: 50/60Hz
    ● Rated impulse withstand voltage (1.2/50): 6kV
    ● Pollution level: 2
    ● Thermal magnetic tripping characteristics: B curve, C curve, D curve
    ● Mechanical life: 10,000 times
    ● Electrical life: 2000 times
    ● Protection level: IP20
    ● Ambient temperature (daily average ≤35℃): -5℃~+40℃
    ● Contact position indicator: green = closed, red = open
    ● Installation: Installed on DIN rail EN 60715 (35mm) through quick clamp device
    ● Recommended torque: 2.5Nm
    ●Connection method: top or bottom connection available
    The JCB3LM-80 Series Earth Leakage Circuit Breakers (ELCB) expands on the technical data to provide a comprehensive set of specifications to ensure reliable, effective electrical protection. Different pole configurations are available, including 1 P+N, 2 pole, 3 pole, 3P+N and 4 pole, to meet the needs of various power distribution systems, providing flexibility and compatibility with a variety of setups.
    Additionally, the wide range of rated currents from 6A to 63A and rated operating voltages of 110V, 230V, 240V and 400V/415V enable these ELCBs to adapt to different electrical loads and voltage requirements. The rated sensitivity I△n range is from 30mA to 300mA, coupled with the rated breaking capacity of 6kA, ensuring accurate and reliable protection against leakage and fault current.
     In addition, ELCB has an insulation voltage of up to 500V, a rated impulse withstand voltage of 6kV, and a pollution level of 2, making it suitable for a wide range of environmental conditions. The availability of different thermal-magnetic trip unit characteristics, mechanical and electrical life specifications and IP20 protection class further emphasizes the durability and reliability of these ELCBs.
    In addition, ease of installation and maintenance is enhanced by contact position indicators, mounting options on DIN rails, and the availability of connections from top or bottom, providing convenience and flexibility to electrical professionals. Overall, the comprehensive technical data of the JCB3LM-80 series ELCB demonstrates their suitability for a variety of electrical applications and their ability to provide strong and reliable protection.


    IEC61009-1 ,  EN61009-1



    Rated current In (A)




    Type (wave form of the earth leakage sensed)

    A or AC are available


    1 pole, 2 Pole, 3 pole, 4 pole

    Rated voltage Ue(V)


    Rated sensitivity I△n


    Insulation voltage Ui (V)


    Rated frequency


    Rated breaking capacity


    Rated impulse withstand voltage(1.2/50) Uimp (V)


    Pollution degree


    Thermo-magnetic release characteristic

    B, C



    Electrical life

    2, 000

    Mechanical life

    2, 000

    Contact position indicator


    Protection degree


    Reference temperature for setting of thermal element(℃)


    Ambient temperature (with daily average ≤35℃)


    Storage temperation (℃)



    Terminal connection type

    Cable/Pin-type busbar

    Terminal size top/bottom for cable

    16~50/6-1/0 AWG

    Terminal size top/bottom for Busbar

    16~35mm2  / 6-2 AWG

    Tightening torque

    3.5 N*m  /  31 In-Ibs.


    On DIN rail EN 60715 (35mm) by means of fast clip device


    From top or bottom are available

    Working and installation conditions
    Ambient air temperature: the upper limit is not greater than +40℃, the lower limit is not less than -5℃, and the 24h average temperature is not more than +35℃
    (1) If the lower limit is -10℃ or -25℃ working conditions, the user must declare it to the manufacturer when ordering.
    (2) If the upper limit exceeds +40℃ or the lower limit is lower than -25℃, the user should negotiate with the manufacturer.
    Installation location: altitude not exceeding 2000m
    Atmospheric conditions: When the ambient air temperature is +40°C, the relative humidity of the atmosphere does not exceed 50%. Higher relative humidity can be tolerated at lower temperatures. For example, 90% at +20°C. Appropriate measures should be taken for the occasional occurrence of condensation due to temperature changes.
    Installation conditions: The external magnetic field at the installation site should not exceed 5 times the geomagnetic field in any direction. Generally, it is installed vertically, with the handle upward as the power-on position, and the tolerance in any direction is 2. There should be no obvious shock or vibration at the installation site.
    Expanding to working and installation conditions, various environmental factors must be considered to ensure the best performance and reliability of the JCB3LM-80 Series Earth Leakage Circuit Breaker (ELCB). Specified ambient air temperature limits (ranging from -5°C to +40°C) and a 24-hour average temperature limit not exceeding +35°C are critical to maintaining the operational integrity of the ELCB. In addition, if the working environment is below -10℃ or -25℃, or exceeds +40℃ or below -25℃, users should communicate with the manufacturer when ordering to ensure that appropriate measures are taken.
    In addition, the installation location should not exceed 2000m above sea level to ensure optimal performance. Taking into account atmospheric conditions, the relative humidity should not exceed 50% when the ambient air temperature is +40°C, and higher relative humidity is allowed at lower temperatures. For example, at +20°C the relative humidity can reach 90%, taking the necessary precautions against occasional condensation due to temperature changes.
    And the installation site should not be subject to an external magnetic field exceeding 5 times the geomagnetic field in any direction.  ELCB is generally installed vertically, with the handle pointing upward to represent the power-on position, and the allowable error in any direction is 2. In addition, the installation location should be free from significant shock or vibration to ensure the stability and normal function of the ELCB. Considering these working and installation conditions is crucial to ensure reliable and effective operation of the JCB3LM-80 series earth leakage circuit breaker in various electrical environments.

    How does the JCB3LM-80 ELCB work?
    The JCB3LM-80 ELCB is designed to provide protection against two main types of electrical faults. The first type is residual current or leakage, which occurs when a circuit is interrupted unexpectedly, usually due to wiring errors or accidental damage during DIY activities. For example, cutting the cable while using an electric hedge trimmer can cause this type of malfunction. If the power supply is not interrupted, individuals may suffer fatal electrical shocks.
    The second type of electrical fault is overcurrent, which may appear as an overload or short circuit. Overloading occurs when a circuit is loaded with too many electrical devices, causing power transmission to exceed the cable's capacity. On the other hand, a short circuit can be caused by insufficient circuit resistance and a significant increase in amperage, posing a higher risk than an overload.

    Different types of ELCB
    These ELCBs are typically installed in homes and are designed to handle AC sinusoidal residual currents, providing protection for inductive, capacitive or resistive equipment. This type of ELCB/RCBO operates immediately to detect imbalance conditions and does not have a delay function.

    Type A
    Type A ELCBs are specifically designed to handle residual pulsating DC currents and AC sinusoidal residual currents up to 6mA. These devices are essential in providing protection against certain types of electrical faults, ensuring the safety of individuals and electrical equipment.
    By understanding the operation and different types of ELCBs, individuals and professionals can make informed decisions regarding the selection and installation of these devices to ensure complete protection against electrical faults in a variety of settings.

    What is leakage?
    Ground leakage is when current flows from a live conductor to the earth through an unintended path. This can occur due to poor insulation, damaged conductors, or contact between a live conductor and the body of the equipment. When such leakage occurs, especially when the leakage current exceeds 30mA, it may cause a significant risk of electric shock. In this case, the consequences of an electric shock can be serious and potentially fatal. To mitigate this risk, protective devices such as earth leakage circuit breakers (ELCBs) are used to detect and disconnect the power supply when such current leakage is detected.

    Cause of leakage
    Leakage can result from a variety of factors, including damaged insulation on live conductors, broken conductors, or improperly grounded equipment. When a live conductor comes into contact with the body of a device, the resulting electrical current can travel through a person's body and reach ground, causing a potential electric shock. Identifying and addressing these causes is critical to preventing electrical hazards and ensuring the safety of individuals and equipment.

    Functions of JCB3LM-80 earth leakage circuit breaker
    The JCB3LM-80 ELCB is an important safety device designed to prevent electric shock by monitoring and detecting leakage current flowing through unintended paths. In addition to protecting against current leakage, these ELCBs also provide protection against overload and short-circuit currents.  The JCB3LM-80 ELCB plays a key role in ensuring electrical safety and preventing potential hazards by promptly detecting and disconnecting power when an electrical fault occurs.

    Pole-based types
    Classification of ELCBs based on the number of poles clearly indicates their application and use in different electrical systems. Understanding the differences between 2-pole, 3-pole and 4-pole ELCBs is critical to ensuring the correct selection and installation of these devices in a variety of electrical setups.
    2-pole ELCB: This type of ELCB is designed for single-phase system protection. It has two input and two output terminals to accommodate phase and neutral connections. By providing protection in single-phase systems, 2-pole ELCBs play a vital role in preventing leakage, overload and short-circuit currents in residential, commercial and industrial environments where single-phase power distribution is prevalent.
    3-pole ELCB: In contrast, 3-pole ELCB is designed for protection in three-wire, three-phase systems. This type of ELCB has three input and three output terminals, making it ideal for applications with three-phase power distribution. Its ability to provide comprehensive protection in three-phase systems makes it an important component of industrial and commercial electrical installations, ensuring the safety and reliability of electrical infrastructure.
    4-pole ELCB: The 4-pole ELCB is designed for protection in four-wire three-phase systems. This type of ELCB has four input and four output terminals and helps ensure complete protection and safety of complex electrical systems with four-wire three-phase power distribution. Its ability to meet the unique requirements of such systems makes it an indispensable component in critical electrical applications such as industrial machinery, data centers and large commercial facilities.
    By understanding the different applications and functions of 2-pole, 3-pole and 4-pole ELCBs, electrical professionals and installers can make informed decisions regarding the selection and deployment of these devices to ensure optimal protection and protection in different electrical environments. Safety.

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