LMB1-63 MCB 6kA 6-63A

Product Overview

The LMB1-63 series miniature circuit breaker (MCB 6kA) is the core protection device for low-voltage final distribution systems. It is installed in consumer units, distribution boards and small control panels to protect downstream circuits, wiring and electrical equipment from damage caused by sustained overload current and short-circuit fault.

With a rated short-circuit breaking capacity of 6kA, it covers rated currents from 6A to 63A, and offers multiple pole configurations and tripping characteristics to adapt to different load natures and distribution architectures. It adopts a mature thermal-magnetic trip mechanism: the bimetallic strip delivers inverse-time overload protection, and the electromagnetic coil provides instantaneous short-circuit tripping. The standard modular DIN-rail design enables fast snap-on installation and flexible combination in distribution enclosures. Compliant with IEC 60898-1 international standard, it is widely applied in residential buildings, commercial offices, retail premises, light industrial sites and public infrastructure power distribution.

Technical Specifications

Application Scenarios

• Residential consumer units and household lighting & socket circuits
• Commercial building and retail shop final distribution boards
• Light industrial workshop and small factory auxiliary circuits
• Office building, hotel and campus power distribution systems
• Lighting, socket and small equipment branch circuit protection
• Renovation and retrofit distribution system upgrading

Our Advantages

1. Full specification stock availability Complete current ratings, pole configurations and curve types in sufficient stock. Support mixed batch orders for panel builders and electrical contractors, with fast bulk shipment available.
2. Accurate and stable tripping performance Precision calibrated bimetallic strip and electromagnetic release, accurate tripping characteristics with temperature compensation, avoids nuisance tripping and ensures selective protection coordination.
3. Strict factory quality inspection Each unit undergoes overload tripping test, short-circuit breaking test, dielectric withstand test and mechanical life test before delivery to ensure reliable on-site performance.
4. Universal standard compatibility Industry-standard mounting dimensions and outline, fully compatible with mainstream MCB 6kA on the market. Can be directly installed in standard distribution boxes without modification.
5. Complete project technical support Provide dimension drawings, wiring diagrams, selection guides and test certificates to support project design, tender bidding and on-site commissioning guidance.

Custom Solution

We provide project-oriented custom solutions for LMB1-63 series MCBs:

• OEM Brand Customization: Custom silk-screen logo, model marking and rating label on product housing for distributor branded resale.
• Specification Customization: Custom current ratings, tripping curves and pole configurations according to project requirements.
• Accessory Customization: Auxiliary contacts, alarm contacts, shunt release and under-voltage release accessories available on demand.
• Export-grade Custom Packing: Neutral carton, customer-branded packaging, seaworthy reinforced packing for long-distance sea transportation.
• Large-project Priority Production: Priority production and delivery schedule for large construction and infrastructure project orders.

Share your required current rating, pole configuration and tripping curve, our engineers will recommend the most suitable MCB solution within 24 working hours.

FAQ

Q1: What is a miniature circuit breaker (MCB) used for?

A: An MCB is an overcurrent protection device installed in distribution circuits. It automatically trips to cut off power under overload and short-circuit faults, protecting wiring and electrical equipment from overheating, fire and damage.

Q2: What is the difference between B-curve and C-curve MCB?

A: B-curve MCB trips at 3-5 times rated current, suitable for resistive loads like lighting and heating. C-curve MCB trips at 5-10 times rated current, suitable for inductive loads like motors and air conditioners with high inrush current.

Q3: What does 6kA breaking capacity mean?

A: 6kA means the MCB can safely interrupt a maximum short-circuit current of 6000 amperes. It is the standard rating for terminal and residential distribution circuits where fault current levels are relatively moderate.

Q4: Is this MCB DIN-rail mountable?

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

Q5: What standard does LMB1-63 comply with?

A: It is designed and fully type tested in accordance with IEC 60898-1 international standard for miniature circuit breakers for household and similar installations.

Q6: Do you support OEM private label service?

A: Yes, we support custom logo and rating label printing on the product. A certain MOQ applies for OEM service.

Q7: What pole configurations are available?

A: Standard options include 1-pole, 2-pole, 3-pole and 4-pole to match different circuit types such as single-phase, three-phase and neutral switching requirements.