LMB1-125P MCB | 1P-4P 125A 400V 6kA Main Circuit Breaker
LMB1-125P MCB | 1P-4P 125A 400V 6kA Main Circuit Breaker
The LVMA LMB1-125P Series MCB 125A Circuit Breaker is a heavy-duty main switch designed for 400V AC systems, available in 1P/2P/3P/4P configurations. Rated at 100A with a 6000A breaking capacity, it provides reliable overcurrent and short-circuit protection for industrial distribution panels. Certified to IEC60947-2 and GB/T14048.2 standards, this DIN rail-mounted breaker is ideal for commercial and industrial main power distribution applications requiring high-current protection.
The LVMA LMB1-125P Series MCB 125A Circuit Breaker is a heavy-duty main switch designed for 400V AC systems, available in 1P/2P/3P/4P configurations. Rated at 100A with a 6000A breaking capacity, it provides reliable overcurrent and short-circuit protection for industrial distribution panels. Certified to IEC60947-2 and GB/T14048.2 standards, this DIN rail-mounted breaker is ideal for commercial and industrial main power distribution applications requiring high-current protection.
1. Product Overview
The LMB1-125P Series Circuit Breaker is a high-performance, heavy-duty main switch engineered for low-voltage AC power distribution systems. Rated at 100A with a 6000A short-circuit breaking capacity, this series is available in 1P/2P/3P/4P configurations, providing robust overcurrent and short-circuit protection for industrial machinery, commercial distribution panels, and critical power infrastructure. Certified to IEC60947-2 and GB/T14048.2 standards, it ensures reliable performance in high-current applications.
2. Core Product Features
1. Versatile Pole Configurations for Every Application
- 1P: Ideal for single-phase high-current circuits and main distribution branches
- 2P: Suitable for single-phase main circuits requiring both live and neutral protection
- 3P: Perfect for three-phase industrial machinery and motor control circuits
- 4P: Designed for three-phase four-wire systems with neutral line protection, ideal for commercial and industrial main distribution panels
2. Heavy-Duty Electrical Performance
- Rated Current: 125A (In=125A), designed for high-current main distribution circuits
- Breaking Capacity: 6000A (Icu=Ics=6kA), safely interrupting severe short-circuit currents
- Trip Characteristics: Cat A with (D)=12In overcurrent protection, optimized for high inrush industrial loads
- Voltage Compatibility: 400V AC 50Hz, suitable for both single-phase and three-phase power systems
3. Safety & Compliance
- Certified to International Standards: Compliant with IEC60947-2 (IEC) and GB/T14048.2 (Chinese national) standards, with 3C certification
- Dual Protection: Overload and short-circuit protection, preventing equipment damage and fire hazards
- High-Efficiency Arc Extinguishing: Advanced arc-quenching mechanism safely contains arcs during fault conditions
- 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 across all pole counts
- Long Service Life: ≥10,000 mechanical operations and ≥4,000 electrical operations for reliable long-term use
3. Key Advantages Over Competitors
| Feature | LVMA LMB1-125P Breaker | Generic Budget Breakers | Mid-Range Competitor Breakers |
|---|---|---|---|
| Breaking Capacity | 6000A (IEC certified) | <4000A, often uncertified | 6000A (some non-certified) |
| Rated Current Stability | 125A continuous rating, no thermal drift | Current derates under high temperature | Moderate stability, limited thermal performance |
| Pole Configurations | 1P/2P/3P/4P full range | Limited to 2P/4P only | Partial range, no 1P option |
| Certification | IEC60947-2, GB/T14048.2, 3C | No third-party certification | Partial certification (IEC only) |
| Housing Durability | Flame-retardant, impact-resistant plastic | Low-grade plastic prone to melting | Standard flame-retardant plastic |
| Contact Material | Silver alloy contacts (low resistance) | Copper contacts (prone to oxidation) | Silver-plated copper contacts |
4. Technical Specifications
| Parameter | Specification |
|---|---|
| Model | LMB1-125P Series |
| Rated Current | 125A (In=125A) |
| Poles | 1P / 2P / 3P / 4P |
| Rated Voltage | 400V AC |
| Frequency | 50Hz |
| Breaking Capacity | 6000A (Icu=Ics=6kA) |
| Trip Characteristics | Cat A, (D)li=12In |
| Compliance Standards | IEC60947-2, GB/T14048.2, 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 main 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 does the “12In” trip characteristic mean for this breaker?
The “(D)li=12In” means the breaker trips at 12 times the rated current (1200A for the 100A model). This D-curve characteristic is optimized for high inrush industrial loads (e.g., motors, transformers), avoiding nuisance tripping during startup while ensuring fast protection against severe faults.
2. What is the difference between this breaker and a standard MCB?
This LMB1-125P series is designed to IEC60947-2, which is a higher standard for main circuit breakers, offering higher rated current (up to 100A) and robust construction suitable for main distribution applications. Standard MCBs (IEC60898) are typically rated up to 63A and designed for branch circuits.
3. Can I use the 1P/2P models in three-phase systems?
- 1P/2P models: Suitable for single-phase circuits only.
- 3P/4P models: Required for three-phase systems. The 4P model also includes neutral line protection for three-phase four-wire systems.
4. What is the breaking capacity, and why is 6kA important?
The 6000A breaking capacity means the breaker can safely interrupt short-circuit currents up to 6000A without damage. This is critical for preventing equipment damage and fire hazards in high-current industrial environments where short-circuit currents can reach high levels.
5. Are these breakers certified for use in industrial environments?
Yes. The LMB1-125P series is certified to IEC60947-2 (international) and GB/T14048.2 (Chinese national) standards, with 3C certification. It meets the requirements for most industrial and commercial electrical installations.
6. How do I install the LMB1-125P circuit breaker?
Installation steps:
- Ensure the power supply is disconnected before installation.
- Mount the breaker on a standard 35mm DIN rail.
- Connect the incoming power lines to the top terminals and outgoing load lines to the bottom terminals, following the pole configuration (1P/2P/3P/4P).
- Secure the wiring with the screw terminals and verify the connections.
- Restore power and test the breaker by switching it ON/OFF to ensure proper operation.
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 LMB1-125P Series Circuit Breaker is a high-performance, heavy-duty main switch engineered for low-voltage AC power distribution systems. Rated at 100A with a 6000A short-circuit breaking capacity, this series is available in 1P/2P/3P/4P configurations, providing robust overcurrent and short-circuit protection for industrial machinery, commercial distribution panels, and critical power infrastructure. Certified to IEC60947-2 and GB/T14048.2 standards, it ensures reliable performance in high-current applications.
2. Core Product Features
1. Versatile Pole Configurations for Every Application
- 1P: Ideal for single-phase high-current circuits and main distribution branches
- 2P: Suitable for single-phase main circuits requiring both live and neutral protection
- 3P: Perfect for three-phase industrial machinery and motor control circuits
- 4P: Designed for three-phase four-wire systems with neutral line protection, ideal for commercial and industrial main distribution panels
2. Heavy-Duty Electrical Performance
- Rated Current: 125A (In=125A), designed for high-current main distribution circuits
- Breaking Capacity: 6000A (Icu=Ics=6kA), safely interrupting severe short-circuit currents
- Trip Characteristics: Cat A with (D)=12In overcurrent protection, optimized for high inrush industrial loads
- Voltage Compatibility: 400V AC 50Hz, suitable for both single-phase and three-phase power systems
3. Safety & Compliance
- Certified to International Standards: Compliant with IEC60947-2 (IEC) and GB/T14048.2 (Chinese national) standards, with 3C certification
- Dual Protection: Overload and short-circuit protection, preventing equipment damage and fire hazards
- High-Efficiency Arc Extinguishing: Advanced arc-quenching mechanism safely contains arcs during fault conditions
- 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 across all pole counts
- Long Service Life: ≥10,000 mechanical operations and ≥4,000 electrical operations for reliable long-term use
3. Key Advantages Over Competitors
| Feature | LVMA LMB1-125P Breaker | Generic Budget Breakers | Mid-Range Competitor Breakers |
|---|---|---|---|
| Breaking Capacity | 6000A (IEC certified) | <4000A, often uncertified | 6000A (some non-certified) |
| Rated Current Stability | 125A continuous rating, no thermal drift | Current derates under high temperature | Moderate stability, limited thermal performance |
| Pole Configurations | 1P/2P/3P/4P full range | Limited to 2P/4P only | Partial range, no 1P option |
| Certification | IEC60947-2, GB/T14048.2, 3C | No third-party certification | Partial certification (IEC only) |
| Housing Durability | Flame-retardant, impact-resistant plastic | Low-grade plastic prone to melting | Standard flame-retardant plastic |
| Contact Material | Silver alloy contacts (low resistance) | Copper contacts (prone to oxidation) | Silver-plated copper contacts |
4. Technical Specifications
| Parameter | Specification |
|---|---|
| Model | LMB1-125P Series |
| Rated Current | 125A (In=125A) |
| Poles | 1P / 2P / 3P / 4P |
| Rated Voltage | 400V AC |
| Frequency | 50Hz |
| Breaking Capacity | 6000A (Icu=Ics=6kA) |
| Trip Characteristics | Cat A, (D)li=12In |
| Compliance Standards | IEC60947-2, GB/T14048.2, 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 main 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 does the “12In” trip characteristic mean for this breaker?
The “(D)li=12In” means the breaker trips at 12 times the rated current (1200A for the 100A model). This D-curve characteristic is optimized for high inrush industrial loads (e.g., motors, transformers), avoiding nuisance tripping during startup while ensuring fast protection against severe faults.
2. What is the difference between this breaker and a standard MCB?
This LMB1-125P series is designed to IEC60947-2, which is a higher standard for main circuit breakers, offering higher rated current (up to 100A) and robust construction suitable for main distribution applications. Standard MCBs (IEC60898) are typically rated up to 63A and designed for branch circuits.
3. Can I use the 1P/2P models in three-phase systems?
- 1P/2P models: Suitable for single-phase circuits only.
- 3P/4P models: Required for three-phase systems. The 4P model also includes neutral line protection for three-phase four-wire systems.
4. What is the breaking capacity, and why is 6kA important?
The 6000A breaking capacity means the breaker can safely interrupt short-circuit currents up to 6000A without damage. This is critical for preventing equipment damage and fire hazards in high-current industrial environments where short-circuit currents can reach high levels.
5. Are these breakers certified for use in industrial environments?
Yes. The LMB1-125P series is certified to IEC60947-2 (international) and GB/T14048.2 (Chinese national) standards, with 3C certification. It meets the requirements for most industrial and commercial electrical installations.
6. How do I install the LMB1-125P circuit breaker?
Installation steps:
- Ensure the power supply is disconnected before installation.
- Mount the breaker on a standard 35mm DIN rail.
- Connect the incoming power lines to the top terminals and outgoing load lines to the bottom terminals, following the pole configuration (1P/2P/3P/4P).
- Secure the wiring with the screw terminals and verify the connections.
- Restore power and test the breaker by switching it ON/OFF to ensure proper operation.
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.
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