In modern residential, commercial and industrial low-voltage power distribution systems, electrical safety protection is the core guarantee for stable power consumption. As a key leakage protection device, Residual Current Breaker (RCCB) is widely used in various terminal circuits to prevent electric shock accidents and electrical fire risks caused by line leakage. Understanding the Rccb working principle, core functions and product characteristics helps users select suitable protective devices for different application scenarios.
RCB or Residual Current Breaker are electrical devices that cut the current from the electrical current so as to prevent electrocution. The current leakage that it can detect is from 5 milliamperes to 30 milliamperes. Essentially, RCB is utilized in circuits to secure human life from electric shock or electrocution.
The working principle of Rccb is based on the current balance monitoring mechanism of phase and neutral wires, which conforms to Kirchhoff’s current law. Under normal operating conditions, the current flowing into the circuit through the phase wire is equal to the current returning through the neutral wire, and the magnetic fluxes generated by the two currents cancel each other out, leaving zero residual flux in the internal transformer core. At this time, the protection device remains in a closed working state.
When an earth fault, line aging leakage or human accidental electric contact occurs, part of the current will leak to the ground instead of returning through the neutral wire, resulting in an unbalanced current difference between the phase and neutral wires. The internal zero-sequence current transformer of the Residual Current Breaker can accurately capture this residual current signal. Once the leakage current exceeds the rated sensitivity threshold of the device, the tripping mechanism will be instantly activated to disconnect the circuit, quickly cutting off the power supply and avoiding electric shock injuries and electrical fire hazards.
Notably, the CJL3-63 series Rccb Circuit Breaker is designed with an independent power supply structure. Its working state is not affected by external power supply fluctuations, line voltage changes and environmental interference, ensuring stable and sensitive fault detection and tripping actions in complex power consumption environments.
C&J Electrical CJL3-63 Rccb Product Overview
CJL3-63 series Residual Current Breaker is a professional earth fault protection device developed in strict accordance with IEC61008 international standards. It supports electromagnetic type and electronic type dual working modes, and is compatible with A-type and AC-type residual current characteristics, adapting to conventional AC circuits and special circuits with DC residual components.
This Rccb Circuit Breaker covers three mainstream rated current specifications of 25A, 40A and 63A, with 2P and 4P pole options, matching 230V/400V low-voltage power distribution systems. It integrates leakage protection and circuit isolation functions, with high short-circuit current withstand capacity and instantaneous tripping response speed. It can be used independently for circuit leakage protection or combined with other protective devices to form a multi-dimensional safety protection system, which is highly compatible with the Rcd Rcbo Rccb matching system.
Core Construction & Product Features
- Dual Functional Protection: It provides reliable earth fault and leakage current protection, and supports circuit isolation function, realizing dual guarantees of safety protection and circuit maintenance.
- High Short-Circuit Withstand Capacity: The rated conditional short-circuit current and residual short-circuit current both reach 10kA, with strong impact resistance to instantaneous short-circuit current and stable operation under fault conditions.
- Visual Contact Indication: Equipped with a clear contact position indication structure, users can intuitively judge the on-off state of the circuit, facilitating daily inspection and maintenance.
- Finger Protection Terminal Design: Adopts finger-protected connection terminals to prevent accidental contact with live parts during installation and operation, improving construction safety.
- High-Grade Fireproof Material: The shell and functional parts are made of fire-resistant plastic materials, which can resist abnormal high-temperature heating and strong impact, with excellent environmental adaptability.
- Instantaneous Fault Disconnection: When earth fault or leakage current exceeds the rated value, the device automatically trips and disconnects the circuit within 0.3s, effectively avoiding safety accidents.
- Strong Anti-Interference Ability: The working mechanism is independent of power supply and line voltage, free from external interference and voltage fluctuation, ensuring long-term stable operation.
Complete Technical Data
CJL3-63 series Residual Current Breaker has standardized and complete technical parameters, compliant with IEC international standards, suitable for global low-voltage electrical engineering applications:
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Technical Items
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Specifications
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Executive Standard
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IEC61008
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Product Mode
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Electro-magnetic type, Electronic type
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Residual Current Type
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A, AC
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Pole Number
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2P, 4P
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Rated Current
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25A, 40A, 63A
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Rated Voltage
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AC 230(240)/400(415)V
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Rated Frequency
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50/60Hz
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Rated Residual Operating Current
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0.03A, 0.1A, 0.3A, 0.5A
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Rated Residual Non-operating Current
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0.5I△n
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Conditional Short-Circuit Current
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10kA
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Conditional Residual Short-Circuit Current
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10kA
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Tripping Duration
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Instantaneous ≤0.3s (0.1s optional)
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Electro-mechanical Endurance
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4000 cycles
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Max Connection Capacity
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25mm² Rigid Conductor
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Terminal Structure
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Pillar terminal with clamp
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Fastening Torque
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2.0Nm
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Installation Method
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35.5mm DIN Rail / Panel Mounting
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Protection Class
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IP20
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Application Scenarios
With stable working principle, high safety and strong environmental adaptability, CJL3-63 Rccb Circuit Breaker is widely used in various low-voltage power distribution scenarios, and can be flexibly matched with Rcd Rcbo Rccb system solutions:
- Residential Power Distribution: Suitable for household main circuits, socket loops and high-power electrical equipment circuits, effectively preventing household electric shock and leakage fire risks.
- Commercial Buildings: Applied to office buildings, shopping malls, hotels and other public building terminal power distribution systems, ensuring safe and stable power consumption for public facilities.
- Industrial Auxiliary Circuits: Used for factory workshop auxiliary equipment and low-load circuit leakage protection, adapting to complex industrial power consumption environments.
- Public Infrastructure: Suitable for community lighting, street lamp power distribution, park facilities and other public electrical equipment, providing long-term stable safety protection.
Product Services & Supply Advantages
CJL3-63 series Residual Current Breaker has diverse specifications, stable performance and high safety factor. Its anti-interference structure and high short-circuit resistance make it more adaptable than ordinary Rccb products in complex working conditions.
C&J Electrical supports OEM/ODM brand customization services to meet personalized product and solution needs of global customers. We have a complete product line including RCCB, RCBO and ACB series products, with rich specification options and wide scenario coverage. Meanwhile, we provide SKD loose parts delivery service to adapt to diverse procurement and assembly cooperation modes. If you have any questions about product selection, parameter matching, working principle consultation and customized cooperation, please feel free to contact us for professional technical support.
Contact Us
In conclusion, the core working principle of Rccb Circuit Breaker is to monitor phase-neutral current balance and quickly respond to residual current faults. C&J Electrical CJL3-63 high-performance Residual Current Breaker optimizes the traditional working structure, with stronger stability and higher safety, which is a reliable choice for upgrading low-voltage power distribution safety systems.
Welcome global customers to consult, purchase and customize products. We will provide full-cycle professional after-sales service and technical support.
Post time: Aug-10-2026