LMB1-125P MCB 125A 6kA

Product Overview

The LMB1-125P series is a compact high-current MCB 125A frame grade for low-voltage terminal distribution systems. It is installed as a main incoming switch or high-capacity branch protection device in consumer units, distribution boards and small control panels, protecting wiring and electrical equipment from damage caused by sustained overload and short-circuit faults.

This 125A MCB series covers rated current options of 40-125A, with a rated short-circuit breaking capacity of 6kA. It is available in 1-pole, 2-pole, 3-pole and 4-pole configurations, making it suitable for both single-phase and three-phase distribution circuits. It uses a mature thermal-magnetic trip mechanism: the bimetallic strip provides inverse-time overload protection, while the electromagnetic coil delivers instantaneous short-circuit tripping. The standard modular design allows quick snap-on installation on 35mm DIN rails, and the clear handle position indicator makes on-site status checking easy.

Manufactured in compliance with IEC 60898-2, the LMB1-125P MCB 125A series is widely applied in residential buildings, commercial premises, light industrial workshops, small factories and general distribution systems where a compact high-current main breaker is required.

Key Product Features

✅ 125A Frame High-Current Rating Standard MCB 125A frame class with 100A and 125A rated current options. Suitable for main incoming switches and high-capacity branch circuits in residential, commercial and light industrial distribution systems.

✅ 6kA Short-Circuit Breaking Capacity Reliable 6kA service short-circuit breaking capacity for terminal distribution applications. Fast arc extinction and instantaneous tripping help isolate short-circuit faults quickly and reduce equipment damage.

✅ 1P / 2P / 3P / 4P Configurations Available in 1-pole, 2-pole, 3-pole and 4-pole versions. Flexible selection for single-phase, three-phase and neutral-separated distribution circuits.

✅ Thermal-Magnetic Dual Protection Integrates overload protection and short-circuit protection in one device. The thermal bimetallic element protects against sustained overcurrent, while the magnetic element trips instantaneously under short-circuit conditions.

✅ Standard DIN-Rail Modular Design Fits universal 35mm DIN rails. Compact modular structure enables easy installation, removal and combination in distribution enclosures, saving wiring and assembly time.

✅ Clear ON/OFF Status Indication High-contrast handle position and label area provide clear visual indication of the operating status, helping operators identify circuit status quickly during inspection and maintenance.

✅ IEC 60898-2 Standard Compliance Designed and fully type tested in accordance with IEC 60898-2, ensuring conformity with international requirements for miniature circuit breakers used in low-voltage distribution systems.

Technical Specifications

Application Scenarios

• Residential main distribution and household main switch protection
• Commercial building and retail shop distribution boards
• Light industrial workshop and small factory incoming circuits
• Three-phase distribution panel main breaker applications
• Office building, hotel and public facility terminal protection
• Small generator and solar inverter AC distribution protection

Our Advantages

1. Compact 125A MCB solution High current rating in a standard MCB form factor, ideal for distribution boards where space is limited but a 100A/125A main switch is required.
2. Reliable fault protection Thermal-magnetic trip mechanism provides accurate overload and short-circuit protection, helping prevent wiring overheating and fire hazards.
3. Multiple pole options 1P, 2P, 3P and 4P versions cover different system architectures, reducing the need for multiple product lines and simplifying project procurement.
4. Easy installation and maintenance Standard DIN-rail mounting and clear status indication allow fast installation, inspection and replacement in distribution panels.
5. Technical support available Provide dimension drawings, wiring diagrams, selection guides and test certificates to support project design, tendering and on-site commissioning.

Custom Solution

We provide project-oriented custom solutions for LMB1-125P series MCB 125A products:

• OEM Brand Customization: Custom logo, model marking and rating label printing on the product housing for branded resale.
• Specification Customization: Custom pole configuration, rated current and packaging according to project requirements.
• Accessory Support: Compatible with standard DIN-rail distribution systems and related low-voltage accessories.
• Export-grade Custom Packing: Neutral carton, customer-branded packaging and seaworthy reinforced packing for long-distance transportation.
• Large-order Priority Production: Priority production schedule for bulk project and OEM orders.

Share your required pole configuration, rated current and application scenario, our engineers will confirm the most suitable LMB1-125P MCB 125A model within 24 working hours.

FAQ

Q1: What is the LMB1-125P MCB used for?

A: It is a 125A frame class miniature circuit breaker (MCB) used for overload and short-circuit protection in low-voltage distribution systems, commonly applied as a main switch or high-current branch protection device.

Q2: Does this series include a 125A rated MCB?

A: Yes. The LMB1-125P is a MCB 125A frame series, offering both 100A and 125A rated current options to match different distribution capacity requirements.

Q3: What does 6kA breaking capacity mean?

A: 6kA is the rated service short-circuit breaking capacity. It means the MCB can safely interrupt a short-circuit current up to 6000A under specified test conditions.

Q4: What pole configurations are available for this 125A MCB?

A: The LMB1-125P MCB 125A series is available in 1P, 2P, 3P and 4P configurations to suit single-phase, three-phase and different distribution system requirements.

Q5: Does it provide both overload and short-circuit protection?

A: Yes, it integrates a thermal-magnetic trip mechanism, providing inverse-time overload protection and instantaneous short-circuit protection.

Q6: Is this MCB DIN-rail mountable?

A: Yes, it fits standard 35mm DIN rails, which is the universal mounting method for modular low-voltage distribution components.

Q7: What standard does this 125A MCB comply with?

A: It complies with IEC 60898-2, the international standard for miniature circuit breakers for low-voltage distribution systems.