LMB1-63 Miniature Circuit Breaker 6kA 1P 2P 3P 4P 6-63A MCB

Product Overview

The LMB1-63 series miniature circuit breaker is a core protective component for low-voltage AC distribution systems. It is installed in distribution boards, consumer units and control panels to protect electrical circuits and equipment from damage caused by overload current and short-circuit fault.

This 6kA breaking capacity MCB covers rated current from 1A up to 63A, with 1-pole, 2-pole, 3-pole and 4-pole options. It adopts bimetallic strip thermal release for overload protection and electromagnetic coil release for instantaneous short-circuit protection. Standard 35mm DIN rail mounting and modular 18mm per pole design make it easy to assemble and rearrange in distribution enclosures. Compliant with IEC 60898-1 international standard, it is widely applied in residential buildings, commercial offices, light industrial workshops and infrastructure power distribution systems.

Key Product Features

✅ Dual Protection: Overload + Short-Circuit Thermal-magnetic trip mechanism: bimetallic strip provides inverse-time overload protection; electromagnetic coil delivers instantaneous short-circuit tripping. Full protection for distribution circuits.

✅ Wide Current Range & Multiple Curve Options Rated current from 1A to 63A. B, C, D tripping curves available for different load types: B for resistive loads, C for general residential/commercial, D for high inrush motor loads.

✅ 6kA Rated Breaking Capacity 6000A short-circuit breaking capacity, effectively interrupts fault current within milliseconds, prevents equipment damage and fire hazard caused by short circuit.

✅ Standard Modular DIN-Rail Design 18mm width per pole, fits universal 35mm DIN rail. Snap-on installation, no complex fixing work required. Compact structure saves internal space of distribution boxes.

✅ Clear ON/OFF Status Indication Ergonomic toggle handle with obvious I-O position marking. Operators can identify switch status at a glance. Tripped position is clearly distinguishable from OFF position for easy fault diagnosis.

✅ Flame-Retardant High-Strength Housing Made of high-grade flame-retardant engineering plastic, excellent dielectric strength, mechanical toughness and aging resistance. Stable performance in long-term distribution environment.

✅ IEC 60898-1 International Standard Manufactured and tested in accordance with IEC 60898-1 standard, CE certified. Meets global low-voltage distribution safety requirements.

Technical Specifications

Application Scenarios

• Residential building consumer units and household distribution circuits
• Commercial office building and shopping mall low-voltage distribution boards
• Light industrial workshop and small factory power distribution systems
• Lighting circuits, socket circuits and general load protection
• Control panel and auxiliary circuit protection for industrial equipment
• Infrastructure and public facility power distribution systems

Our Advantages

1. Full specification stock availability Complete current ratings and pole configurations in stock, support mixed batch orders for panel builders, with fast bulk shipment available.
2. Stable and reliable tripping performance Precision calibrated bimetallic strip and electromagnetic release mechanism, accurate tripping characteristics, avoid false tripping and failure to trip.
3. Strict factory quality inspection Each unit undergoes overload tripping test, short-circuit breaking test and dielectric withstand test before delivery to ensure reliable on-site performance.
4. Universal compatible dimensions Standard mounting dimensions and terminal layout, fully compatible with mainstream MCBs on the market. Can be directly replaced without cabinet modification.
5. Complete technical documentation support Provide dimension drawings, wiring diagrams, selection guides and product datasheets to support project design and tender bidding. Fast overseas technical response.

Custom Solution

We provide project-oriented custom solutions for LMB1-63 miniature circuit breaker:

• OEM Brand Customization: Custom silk-screen logo and model marking on product housing for branded resale.
• Specification Customization: Custom current ratings, pole configurations and tripping curves according to project requirements.
• Export-grade Custom Packing: Neutral carton, customer-branded packaging, seaworthy reinforced packing for long-distance sea transportation.
• Project-level Technical Support: Supply CAD drawings, test reports and certification documents for project bidding and local approval.
• Large-order Priority Production: Priority production scheduling for large-volume project orders to guarantee delivery lead time.

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

FAQ

Q1: What is the difference between B, C and D curve MCBs?

A: B-curve trips at 3-5 times rated current, for resistive loads. C-curve trips at 5-10 times rated current, for general residential and commercial use. D-curve trips at 10-20 times rated current, for motor loads with high inrush current.

Q2: What is the breaking capacity of LMB1-63 MCB?

A: Standard LMB1-63 series has 6kA rated short-circuit breaking capacity, which meets the requirements of most residential and commercial distribution systems.

Q3: 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.

Q4: What standards does LMB1-63 comply with?

A: It complies with IEC 60898-1 international standard for miniature circuit breakers, and also meets IEC 60947-2 requirements.

Q5: Do you support OEM private label service for distributors?

A: Yes, we support custom logo and marking printing on the product, with a certain MOQ applied for OEM service.

Q6: Can it replace other brands of 63A MCB directly?

A: Yes, its standard mounting dimensions and terminal layout are compatible with mainstream miniature circuit breakers on the market, allowing direct drop-in replacement.

Q7: What pole options are available for this series?

A: Standard options include 1P, 2P, 3P and 4P to match different types of distribution circuit requirements.

Package Content

1 × LMB1-63 Miniature Circuit Breaker