LMBS-63 Dual Power Interlock MCB | 1P+1P to 4P+4P ATS
LMBS-63 Dual Power Interlock MCB | 1P+1P to 4P+4P ATS
The LMBS-63 Dual Power Interlock MCB is a pair of mechanically interlock miniature circuit breakers designed for automatic transfer switch (ATS) and dual power distribution applications. Available in 1P+1P, 2P+2P, 3P+3P, and 4P+4P configurations, this 63A C63 curve breaker ensures only one circuit is energized at a time, preventing cross-feed and backfeeding hazards. With a 6kA breaking capacity at 400V AC and compliance with IEC60898/GB/T10963.1 standards, it delivers reliable overcurrent/short-circuit protection for main and backup power sources. The compact DIN-rail design and clear ON/OFF indicators make it ideal for residential, commercial, and industrial generator backup systems.
The LMBS-63 Dual Power Interlock MCB is a pair of mechanically interlock miniature circuit breakers designed for automatic transfer switch (ATS) and dual power distribution applications. Available in 1P+1P, 2P+2P, 3P+3P, and 4P+4P configurations, this 63A C63 curve breaker ensures only one circuit is energized at a time, preventing cross-feed and backfeeding hazards. With a 6kA breaking capacity at 400V AC and compliance with IEC60898/GB/T10963.1 standards, it delivers reliable overcurrent/short-circuit protection for main and backup power sources. The compact DIN-rail design and clear ON/OFF indicators make it ideal for residential, commercial, and industrial generator backup systems.
The LVMA LMBS-63 Dual Power Interlock Miniature Circuit Breaker (MCB) is a specialized solution for automatic transfer switch (ATS) and dual power distribution systems. Composed of two mechanically interlock independent MCB units, this series prevents simultaneous energization of two power sources, eliminating cross-feed, backfeeding, and short-circuit risks in main/backup power setups. Available in four pole configurations (1P+1P, 2P+2P, 3P+3P, 4P+4P), this 63A C63 curve breaker meets IEC and CCC standards, making it the trusted choice for generator backup, commercial power distribution, and critical load protection.
1. Core Specifications
| Parameter | Details |
|---|---|
| Product Series | LMBS-63 Dual Power Interlock MCB |
| Pole Configurations | 1P+1P, 2P+2P, 3P+3P, 4P+4P |
| Rated Current (In) | 63A (per unit) |
| Rated Voltage (Ue) | 230V AC (1P+1P/2P+2P) / 400V AC (3P+3P/4P+4P) |
| Rated Breaking Capacity (Icn) | 6000A (6kA) |
| Trip Curve | B/C/D Curve (C63) |
| Interlock Type | Mechanical interlock (prevents simultaneous ON) |
| Standards Compliance | IEC 60898-1, GB/T 10963.1, CCC Certified |
| Frequency | 50Hz |
| Mounting Type | 35mm DIN Rail |
| Housing Material | Flame-retardant thermoplastic |
| Terminals | Screw terminals (top/bottom) |
2. Key Features & Benefits
1. Mechanical Interlock Safety Design
The core feature of the LMBS-63 series is its mechanical interlock mechanism, which ensures only one of the two MCB units can be in the ON position at any time. This prevents backfeeding between main and backup power sources, eliminating arc flash hazards, equipment damage, and safety risks in ATS applications. The interlock is factory-integrated for reliable, maintenance-free operation.
2. Versatile Pole Configurations for Every ATS Need
Choose from four pole options to match your system requirements:
- 1P+1P: For single-phase, single-wire ATS applications (residential backup power, lighting circuits).
- 2P+2P: For single-phase 230V AC systems (residential/commercial backup, small appliances).
- 3P+3P: For 3-phase 400V AC industrial/commercial power distribution (motors, HVAC systems).
- 4P+4P: For 3-phase + neutral ATS systems (commercial buildings, data centers, critical infrastructure).
3. Reliable Overcurrent & Short-Circuit Protection
With a C63 trip curve and 6kA breaking capacity, each unit provides fast, dependable protection against overloads and short circuits:
- The C-curve trips at 5–10x rated current, avoiding nuisance tripping from motor startup surges while ensuring fast fault interruption.
- The 6kA breaking capacity safely interrupts high short-circuit currents, protecting equipment and preventing fire hazards in both residential and light industrial settings.
4. Certified Compliance & Durability
Manufactured to meet IEC 60898-1 and GB/T 10963.1 standards, with CCC certification, the LMB1-63 series undergoes rigorous testing for safety and performance. The flame-retardant thermoplastic housing resists impact, heat, and corrosion, while the ergonomic green operating handles provide clear ON/OFF visibility for safe maintenance.
5. Compact DIN Rail Installation
Designed for standard 35mm DIN rail mounting, the interlocked dual MCB units occupy minimal panel space, reducing installation complexity in ATS control panels. The screw terminals ensure secure, vibration-resistant connections for copper conductors, simplifying wiring and reducing installation time.
3. Common Applications
The LVMA LMBS-63 Dual Power Interlock MCB is ideal for use in:
- ATS (Automatic Transfer Switch) Systems: Main/backup power switching for generators, solar systems, and grid power.
- Residential Backup Power: Single/three-phase generator backup for homes and small businesses.
- Commercial Power Distribution: Office buildings, retail centers, and hotels with dual power feeds.
- Industrial Machinery: Equipment requiring redundant power supplies to avoid downtime.
- Critical Infrastructure: Hospitals, data centers, and telecom sites needing uninterrupted power.
3. Installation & Safety Guidelines
- Certified Installation: Installation must be performed by a qualified electrician in accordance with local electrical codes and standards.
- Interlock Verification: Ensure the mechanical interlock functions correctly before energizing the system (one unit ON = other unit OFF).
- Terminal Torque: Tighten screw terminals to the recommended torque specification to prevent overheating and loose connections.
- Orientation: Install vertically on a DIN rail with terminals facing up/down for optimal arc quenching performance.
- Load Matching: Select the appropriate pole configuration based on your system voltage (230V/400V) and phase requirements.
4. Frequently Asked Questions (FAQ)
Q1: What is the purpose of the mechanical interlock in this dual power MCB?
The mechanical interlock ensures only one of the two breakers can be ON at the same time, preventing backfeeding between the main power source and backup generator. This eliminates cross-feed hazards, arc flash risks, and damage to equipment.
Q2: Can I use different pole configurations for the two breakers (e.g., 1P+2P)?
No, the LMB1-63 series is factory-configured with matched pole counts (1P+1P, 2P+2P, 3P+3P, 4P+4P) to ensure balanced operation. Mismatched poles would compromise safety and interlock functionality.
Q3: What is the difference between this interlock MCB and a standard ATS switch?
This interlock MCB provides both protection (overcurrent/short-circuit) and transfer safety (interlock) in one compact unit, whereas a standard ATS switch only handles power transfer without built-in circuit protection.
Q4: What wire size is recommended for the 63A model?
For 63A continuous current, we recommend copper conductors of 16mm²–25mm² cross-section, depending on installation method and ambient temperature. Always refer to local electrical codes and consult an electrician.
5. Why Choose LVMA for Dual Power Protection?
LVMA Electric specializes in low-voltage power distribution and protection solutions. The LMBS-63 series combines robust mechanical interlock design, certified safety standards, and versatile pole configurations to meet the unique needs of ATS and dual power systems. Backed by strict quality control and compliance with international standards, LVMA ensures reliable, safe performance for every application.
6. 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.
The LVMA LMBS-63 Dual Power Interlock Miniature Circuit Breaker (MCB) is a specialized solution for automatic transfer switch (ATS) and dual power distribution systems. Composed of two mechanically interlock independent MCB units, this series prevents simultaneous energization of two power sources, eliminating cross-feed, backfeeding, and short-circuit risks in main/backup power setups. Available in four pole configurations (1P+1P, 2P+2P, 3P+3P, 4P+4P), this 63A C63 curve breaker meets IEC and CCC standards, making it the trusted choice for generator backup, commercial power distribution, and critical load protection.
1. Core Specifications
| Parameter | Details |
|---|---|
| Product Series | LMBS-63 Dual Power Interlock MCB |
| Pole Configurations | 1P+1P, 2P+2P, 3P+3P, 4P+4P |
| Rated Current (In) | 63A (per unit) |
| Rated Voltage (Ue) | 230V AC (1P+1P/2P+2P) / 400V AC (3P+3P/4P+4P) |
| Rated Breaking Capacity (Icn) | 6000A (6kA) |
| Trip Curve | B/C/D Curve (C63) |
| Interlock Type | Mechanical interlock (prevents simultaneous ON) |
| Standards Compliance | IEC 60898-1, GB/T 10963.1, CCC Certified |
| Frequency | 50Hz |
| Mounting Type | 35mm DIN Rail |
| Housing Material | Flame-retardant thermoplastic |
| Terminals | Screw terminals (top/bottom) |
2. Key Features & Benefits
1. Mechanical Interlock Safety Design
The core feature of the LMBS-63 series is its mechanical interlock mechanism, which ensures only one of the two MCB units can be in the ON position at any time. This prevents backfeeding between main and backup power sources, eliminating arc flash hazards, equipment damage, and safety risks in ATS applications. The interlock is factory-integrated for reliable, maintenance-free operation.
2. Versatile Pole Configurations for Every ATS Need
Choose from four pole options to match your system requirements:
- 1P+1P: For single-phase, single-wire ATS applications (residential backup power, lighting circuits).
- 2P+2P: For single-phase 230V AC systems (residential/commercial backup, small appliances).
- 3P+3P: For 3-phase 400V AC industrial/commercial power distribution (motors, HVAC systems).
- 4P+4P: For 3-phase + neutral ATS systems (commercial buildings, data centers, critical infrastructure).
3. Reliable Overcurrent & Short-Circuit Protection
With a C63 trip curve and 6kA breaking capacity, each unit provides fast, dependable protection against overloads and short circuits:
- The C-curve trips at 5–10x rated current, avoiding nuisance tripping from motor startup surges while ensuring fast fault interruption.
- The 6kA breaking capacity safely interrupts high short-circuit currents, protecting equipment and preventing fire hazards in both residential and light industrial settings.
4. Certified Compliance & Durability
Manufactured to meet IEC 60898-1 and GB/T 10963.1 standards, with CCC certification, the LMB1-63 series undergoes rigorous testing for safety and performance. The flame-retardant thermoplastic housing resists impact, heat, and corrosion, while the ergonomic green operating handles provide clear ON/OFF visibility for safe maintenance.
5. Compact DIN Rail Installation
Designed for standard 35mm DIN rail mounting, the interlocked dual MCB units occupy minimal panel space, reducing installation complexity in ATS control panels. The screw terminals ensure secure, vibration-resistant connections for copper conductors, simplifying wiring and reducing installation time.
3. Common Applications
The LVMA LMBS-63 Dual Power Interlock MCB is ideal for use in:
- ATS (Automatic Transfer Switch) Systems: Main/backup power switching for generators, solar systems, and grid power.
- Residential Backup Power: Single/three-phase generator backup for homes and small businesses.
- Commercial Power Distribution: Office buildings, retail centers, and hotels with dual power feeds.
- Industrial Machinery: Equipment requiring redundant power supplies to avoid downtime.
- Critical Infrastructure: Hospitals, data centers, and telecom sites needing uninterrupted power.
3. Installation & Safety Guidelines
- Certified Installation: Installation must be performed by a qualified electrician in accordance with local electrical codes and standards.
- Interlock Verification: Ensure the mechanical interlock functions correctly before energizing the system (one unit ON = other unit OFF).
- Terminal Torque: Tighten screw terminals to the recommended torque specification to prevent overheating and loose connections.
- Orientation: Install vertically on a DIN rail with terminals facing up/down for optimal arc quenching performance.
- Load Matching: Select the appropriate pole configuration based on your system voltage (230V/400V) and phase requirements.
4. Frequently Asked Questions (FAQ)
Q1: What is the purpose of the mechanical interlock in this dual power MCB?
The mechanical interlock ensures only one of the two breakers can be ON at the same time, preventing backfeeding between the main power source and backup generator. This eliminates cross-feed hazards, arc flash risks, and damage to equipment.
Q2: Can I use different pole configurations for the two breakers (e.g., 1P+2P)?
No, the LMB1-63 series is factory-configured with matched pole counts (1P+1P, 2P+2P, 3P+3P, 4P+4P) to ensure balanced operation. Mismatched poles would compromise safety and interlock functionality.
Q3: What is the difference between this interlock MCB and a standard ATS switch?
This interlock MCB provides both protection (overcurrent/short-circuit) and transfer safety (interlock) in one compact unit, whereas a standard ATS switch only handles power transfer without built-in circuit protection.
Q4: What wire size is recommended for the 63A model?
For 63A continuous current, we recommend copper conductors of 16mm²–25mm² cross-section, depending on installation method and ambient temperature. Always refer to local electrical codes and consult an electrician.
5. Why Choose LVMA for Dual Power Protection?
LVMA Electric specializes in low-voltage power distribution and protection solutions. The LMBS-63 series combines robust mechanical interlock design, certified safety standards, and versatile pole configurations to meet the unique needs of ATS and dual power systems. Backed by strict quality control and compliance with international standards, LVMA ensures reliable, safe performance for every application.
6. 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.