LMB1LE-80 RCBO | 63A 50mA Residual Current Circuit Breaker
LMB1LE-80 RCBO | 63A 50mA Residual Current Circuit Breaker
The LMB1LE-80 RCBO (Residual Current Circuit Breaker with Overcurrent Protection) is a 4-pole, 63A rated device combining residual current (50mA) and overcurrent protection. Designed for 400V AC systems with a 6000A breaking capacity, it safeguards against electric shock, overloads, and short circuits. IEC61009-1 and GB/T16917.1 certified, this DIN rail-mounted breaker is ideal for industrial and commercial three-phase applications requiring comprehensive circuit protection.
The LMB1LE-80 RCBO (Residual Current Circuit Breaker with Overcurrent Protection) is a 4-pole, 63A rated device combining residual current (50mA) and overcurrent protection. Designed for 400V AC systems with a 6000A breaking capacity, it safeguards against electric shock, overloads, and short circuits. IEC61009-1 and GB/T16917.1 certified, this DIN rail-mounted breaker is ideal for industrial and commercial three-phase applications requiring comprehensive circuit protection.
1. Product Overview
The LMB1LE-80 RCBO is a high-performance, 4-pole residual current circuit breaker with integrated overcurrent protection. Designed for three-phase 400V AC systems, this 63A C63 curve breaker combines 50mA residual current protection with 6000A short-circuit breaking capacity, delivering comprehensive protection against electric shock, overloads, and short circuits. Certified to IEC61009-1 and GB/T16917.1 standards, it is ideal for industrial machinery, commercial distribution panels, and critical power systems requiring reliable safety and circuit protection.
2. Core Product Features
1. Dual Protection: Residual Current + Overcurrent
- Residual Current Protection: 50mA rated residual operating current, quickly tripping to prevent electric shock hazards in the event of earth leakage
- Overcurrent/Short-Circuit Protection: C63 curve overcurrent protection (63A rated) with 6000A breaking capacity, isolating overloads and short circuits instantly
- Combined Functionality: Eliminates the need for separate MCB and RCCB, saving panel space and simplifying installation
2. Robust Electrical Performance
- 4-Pole Configuration: Full protection for three-phase four-wire systems, including neutral line monitoring
- Rated Parameters: 63A rated current, 400V AC 50Hz, 50mA residual current, 6000A breaking capacity
- C63 Trip Curve: Optimized for industrial loads with moderate inrush currents, avoiding nuisance tripping while ensuring fast fault response
- Selective Tripping: 0.2s maximum tripping time, meeting safety standards for residual current protection
3. Safety & Compliance
- Certified to International Standards: Compliant with IEC61009-1 (IEC) and GB/T16917.1 (Chinese national) standards, with 3C certification
- Test Button Function: Monthly test button to verify residual current protection functionality, ensuring ongoing safety
- Arc Extinguishing System: High-efficiency arc-quenching mechanism safely contains arcs during fault conditions, preventing electrical fires
- Clear Status Indication: Visible ON/OFF markings for quick circuit status identification
4. Durable Construction & Installation
- DIN Rail Mount: Standard 35mm DIN rail mounting for quick, tool-less installation in distribution panels
- Flame-Retardant Housing: High-grade thermoplastic housing with excellent heat and impact resistance
- Modular Design: Compact form factor saves valuable panel space, with uniform dimensions for system expansion
- Long Service Life: ≥10,000 mechanical operations and ≥4,000 electrical operations for reliable long-term use
3. Key Advantages Over Competitors
| Feature | LMB1LE-80 RCBO | Generic Budget RCBOs | Mid-Range Competitor RCBOs |
|---|---|---|---|
| Breaking Capacity | 6000A (IEC certified) | Often uncertified, <4000A | 6000A (some non-certified) |
| Residual Current Accuracy | Stable 50mA trip, no nuisance tripping | Inconsistent residual current response | Moderate accuracy, occasional false trips |
| Protection Type | Combined overcurrent + residual | Only residual or basic overcurrent | Combined protection with limited certification |
| Certification | IEC61009-1, GB/T16917.1, 3C | No third-party certification | Partial certification (IEC only) |
| Test Function | Built-in monthly test button | No test button (no way to verify function) | Basic test button with no calibration |
| Housing Durability | Flame-retardant, impact-resistant plastic | Low-grade plastic prone to melting | Standard flame-retardant plastic |
4. Technical Specifications
| Parameter | Specification |
|---|---|
| Model | LMB1LE-80 |
| Rated Current | 63A (C63 curve) |
| Poles | 4P (Three-phase + Neutral) |
| Rated Voltage | 400V AC |
| Frequency | 50Hz |
| Residual Operating Current (IΔn) | 50mA, 100mA, 300mA |
| Breaking Capacity | 6000A |
| Trip Curve | B/C/D -Curve |
| Compliance Standards | IEC61009-1, GB/T16917.1, 3C Certified |
| Mounting Type | 35mm DIN Rail |
| Operating Temperature | -25°C to +40°C |
| Mechanical Endurance | ≥10,000 operations |
| Electrical Endurance | ≥4,000 operations |
| Housing Material | Flame-retardant thermoplastic |
| Terminal Type | Screw-type, copper conductor compatible |
5. Typical Applications
- Industrial three-phase machinery control panels
- Commercial building distribution boards
- Manufacturing line power distribution systems
- HVAC and pump control systems
- Renewable energy power distribution (solar/wind)
- Public facilities and infrastructure power systems
6. Frequently Asked Questions (FAQ)
1. What is the difference between RCBO and separate MCB + RCCB?
An RCBO combines both overcurrent (MCB) and residual current (RCCB) protection in a single device. This eliminates the need for two separate components, saving panel space, simplifying installation, and reducing potential wiring errors.
2. Why is 50mA residual current important for safety?
50mA is a critical threshold for preventing severe electric shock in humans. The LMB1LE-80 trips at 50mA, quickly isolating the circuit to reduce the risk of injury in the event of earth leakage.
3. What does the “test button” do, and how often should I use it?
The test button verifies that the residual current protection function is working correctly. We recommend pressing it once a month (as indicated on the device) to ensure ongoing safety and functionality.
4. Can this RCBO be used in single-phase systems?
The LMB1LE-80 is a 4-pole device designed for three-phase four-wire systems. For single-phase applications, we recommend selecting 2-pole RCBO models from the same series for optimal performance.
5. What is the breaking capacity of this RCBO, and what does it mean?
This RCBO has a 6000A breaking capacity, meaning it can safely interrupt short-circuit currents up to 6000A without damage to the device or the panel. This is critical for preventing equipment damage and fire hazards during severe faults.
6. Is this RCBO certified for use in industrial environments?
Yes. The LMB1LE-80 is certified to IEC61009-1 (international) and GB/T16917.1 (Chinese national) standards, with 3C certification. It meets the requirements for most industrial and commercial electrical installations.
7. How do I install the LMB1LE-80 RCBO?
Installation steps:
- Ensure the power supply is disconnected before installation.
- Mount the RCBO on a standard 35mm DIN rail.
- Connect the three-phase lines (L1/L2/L3) and neutral line (N) to the corresponding terminals (marked 1,3,5,7 for line side and 2,4,6,8 for load side).
- Secure the wiring with the screw terminals and verify the connections.
- After installation, press the test button to confirm residual current protection functionality.
7. Technical documentation and support
Download the full datasheet for detailed specifications, wiring diagrams and trip coordination guides.
Please contact our technical team for custom configuration or OEM/ODM solutions for your project.
Request a quote with details about your project for volume pricing, lead times, and compliance certifications.
1. Product Overview
The LMB1LE-80 RCBO is a high-performance, 4-pole residual current circuit breaker with integrated overcurrent protection. Designed for three-phase 400V AC systems, this 63A C63 curve breaker combines 50mA residual current protection with 6000A short-circuit breaking capacity, delivering comprehensive protection against electric shock, overloads, and short circuits. Certified to IEC61009-1 and GB/T16917.1 standards, it is ideal for industrial machinery, commercial distribution panels, and critical power systems requiring reliable safety and circuit protection.
2. Core Product Features
1. Dual Protection: Residual Current + Overcurrent
- Residual Current Protection: 50mA rated residual operating current, quickly tripping to prevent electric shock hazards in the event of earth leakage
- Overcurrent/Short-Circuit Protection: C63 curve overcurrent protection (63A rated) with 6000A breaking capacity, isolating overloads and short circuits instantly
- Combined Functionality: Eliminates the need for separate MCB and RCCB, saving panel space and simplifying installation
2. Robust Electrical Performance
- 4-Pole Configuration: Full protection for three-phase four-wire systems, including neutral line monitoring
- Rated Parameters: 63A rated current, 400V AC 50Hz, 50mA residual current, 6000A breaking capacity
- C63 Trip Curve: Optimized for industrial loads with moderate inrush currents, avoiding nuisance tripping while ensuring fast fault response
- Selective Tripping: 0.2s maximum tripping time, meeting safety standards for residual current protection
3. Safety & Compliance
- Certified to International Standards: Compliant with IEC61009-1 (IEC) and GB/T16917.1 (Chinese national) standards, with 3C certification
- Test Button Function: Monthly test button to verify residual current protection functionality, ensuring ongoing safety
- Arc Extinguishing System: High-efficiency arc-quenching mechanism safely contains arcs during fault conditions, preventing electrical fires
- Clear Status Indication: Visible ON/OFF markings for quick circuit status identification
4. Durable Construction & Installation
- DIN Rail Mount: Standard 35mm DIN rail mounting for quick, tool-less installation in distribution panels
- Flame-Retardant Housing: High-grade thermoplastic housing with excellent heat and impact resistance
- Modular Design: Compact form factor saves valuable panel space, with uniform dimensions for system expansion
- Long Service Life: ≥10,000 mechanical operations and ≥4,000 electrical operations for reliable long-term use
3. Key Advantages Over Competitors
| Feature | LMB1LE-80 RCBO | Generic Budget RCBOs | Mid-Range Competitor RCBOs |
|---|---|---|---|
| Breaking Capacity | 6000A (IEC certified) | Often uncertified, <4000A | 6000A (some non-certified) |
| Residual Current Accuracy | Stable 50mA trip, no nuisance tripping | Inconsistent residual current response | Moderate accuracy, occasional false trips |
| Protection Type | Combined overcurrent + residual | Only residual or basic overcurrent | Combined protection with limited certification |
| Certification | IEC61009-1, GB/T16917.1, 3C | No third-party certification | Partial certification (IEC only) |
| Test Function | Built-in monthly test button | No test button (no way to verify function) | Basic test button with no calibration |
| Housing Durability | Flame-retardant, impact-resistant plastic | Low-grade plastic prone to melting | Standard flame-retardant plastic |
4. Technical Specifications
| Parameter | Specification |
|---|---|
| Model | LMB1LE-80 |
| Rated Current | 63A (C63 curve) |
| Poles | 4P (Three-phase + Neutral) |
| Rated Voltage | 400V AC |
| Frequency | 50Hz |
| Residual Operating Current (IΔn) | 50mA, 100mA, 300mA |
| Breaking Capacity | 6000A |
| Trip Curve | B/C/D -Curve |
| Compliance Standards | IEC61009-1, GB/T16917.1, 3C Certified |
| Mounting Type | 35mm DIN Rail |
| Operating Temperature | -25°C to +40°C |
| Mechanical Endurance | ≥10,000 operations |
| Electrical Endurance | ≥4,000 operations |
| Housing Material | Flame-retardant thermoplastic |
| Terminal Type | Screw-type, copper conductor compatible |
5. Typical Applications
- Industrial three-phase machinery control panels
- Commercial building distribution boards
- Manufacturing line power distribution systems
- HVAC and pump control systems
- Renewable energy power distribution (solar/wind)
- Public facilities and infrastructure power systems
6. Frequently Asked Questions (FAQ)
1. What is the difference between RCBO and separate MCB + RCCB?
An RCBO combines both overcurrent (MCB) and residual current (RCCB) protection in a single device. This eliminates the need for two separate components, saving panel space, simplifying installation, and reducing potential wiring errors.
2. Why is 50mA residual current important for safety?
50mA is a critical threshold for preventing severe electric shock in humans. The LMB1LE-80 trips at 50mA, quickly isolating the circuit to reduce the risk of injury in the event of earth leakage.
3. What does the “test button” do, and how often should I use it?
The test button verifies that the residual current protection function is working correctly. We recommend pressing it once a month (as indicated on the device) to ensure ongoing safety and functionality.
4. Can this RCBO be used in single-phase systems?
The LMB1LE-80 is a 4-pole device designed for three-phase four-wire systems. For single-phase applications, we recommend selecting 2-pole RCBO models from the same series for optimal performance.
5. What is the breaking capacity of this RCBO, and what does it mean?
This RCBO has a 6000A breaking capacity, meaning it can safely interrupt short-circuit currents up to 6000A without damage to the device or the panel. This is critical for preventing equipment damage and fire hazards during severe faults.
6. Is this RCBO certified for use in industrial environments?
Yes. The LMB1LE-80 is certified to IEC61009-1 (international) and GB/T16917.1 (Chinese national) standards, with 3C certification. It meets the requirements for most industrial and commercial electrical installations.
7. How do I install the LMB1LE-80 RCBO?
Installation steps:
- Ensure the power supply is disconnected before installation.
- Mount the RCBO on a standard 35mm DIN rail.
- Connect the three-phase lines (L1/L2/L3) and neutral line (N) to the corresponding terminals (marked 1,3,5,7 for line side and 2,4,6,8 for load side).
- Secure the wiring with the screw terminals and verify the connections.
- After installation, press the test button to confirm residual current protection functionality.
7. Technical documentation and support
Download the full datasheet for detailed specifications, wiring diagrams and trip coordination guides.
Please contact our technical team for custom configuration or OEM/ODM solutions for your project.
Request a quote with details about your project for volume pricing, lead times, and compliance certifications.
Related Products
Contact Us
Have questions about our products or services? Our team is here to help you with any inquiries.