LMW1 Series Intelligent Air Circuit Breaker (ACB)

Product Overview

The LMW1 series intelligent air circuit breaker is the core protection and control device for low-voltage 3-phase distribution systems. It is installed as main incoming breaker, bus tie breaker or high-capacity feeder breaker in low-voltage switchgear assemblies, responsible for connecting, breaking and protecting the main power circuit against overload, short circuit, under voltage, over voltage, earth fault and phase imbalance faults.

This 1600A 4-pole drawout model integrates a high-performance microprocessor protection controller, which not only realizes accurate multi-parameter protection, but also supports real-time electrical measurement, energy metering, fault event recording and remote communication. The unique drawout chassis allows the breaker body to be racked in, racked out and isolated without disconnecting main busbars, greatly simplifying on-site maintenance, testing and replacement. It is widely applied in industrial manufacturing plants, large commercial buildings, data centers, renewable energy power stations and infrastructure power distribution systems.

Key Product Features

✅ Microprocessor Intelligent Controller Built-in digital microprocessor release unit with LCD display and keypad. Provides full protection functions including long-time overload, short-time delay, instantaneous short circuit, ground fault, under/over voltage and phase loss. Supports protection parameter setting and fault event recording for accurate selective protection.

✅ Drawout Type with Isolation Position Three-position drawout chassis: connected position, test position and isolated position. Breaker can be racked out for maintenance without powering off the upstream busbar. Clear isolation gap ensures personnel safety during overhaul and component replacement.

✅ Electric Stored Energy Operation Motor-driven spring charging mechanism with manual charging backup. Supports electric closing and opening via control signals, and also supports manual local operation. Equipped with shunt release, under-voltage release and other accessories for automatic control requirements.

✅ High Short-Circuit Breaking Capacity High breaking capacity grade design, reliably interrupts maximum short-circuit current at rated voltage. Excellent arc quenching system ensures fast arc extinction and low overvoltage, protects downstream equipment from fault impact.

✅ Real-Time Measurement & Energy Metering The controller measures real-time voltage, current, power, frequency, power factor and energy data. Replaces separate meters and transducers, saves cabinet space and reduces system cost.

✅ Communication & Remote Monitoring Standard communication interface supports Modbus RTU and other mainstream protocols. Can be connected to SCADA, power management system and building automation system to realize remote monitoring, control and centralized management.

✅ IEC 60947-2 International Standard Manufactured and fully type tested in accordance with IEC 60947-2 and GB/T 14048.2 standards. Passed breaking capacity test, temperature rise test, endurance test and dielectric test, qualified for global industrial distribution projects.

Technical Specifications

表格

Application Scenarios

• Industrial plant low-voltage main distribution switchgear
• Large commercial building and shopping mall main incoming protection
• Data center and IDC critical power distribution systems
• Photovoltaic, wind power and energy storage grid-connection systems
• Infrastructure, hospital and airport power distribution rooms
• Bus tie and heavy feeder circuits in LV switchgear assemblies

Our Advantages

1. Accurate intelligent selective protection Digital microprocessor controller with high sampling accuracy, adjustable protection parameters and time delay, realizes accurate selective cooperation between upper and lower breakers, minimizes power outage range and improves system reliability.
2. Safe and convenient drawout maintenance Three-position drawout structure realizes complete electrical isolation, supports live maintenance on switchgear bus side, greatly shortens maintenance downtime and improves operation safety.
3. Integrated metering & communication Built-in multi-function measurement and communication eliminates the need for additional meters and transmitters, reduces system cost and supports intelligent power management.
4. Strict full type test verification Each frame size undergoes complete type test in authorized laboratory, including breaking capacity, endurance, temperature rise and dielectric test, ensuring reliable performance under fault conditions.
5. Full project technical support Provide dimension drawings, wiring diagrams, selection guides, test certificates and communication protocol documents. Support project design, tender bidding and on-site commissioning guidance.

Custom Solution

We provide project-oriented custom solutions for LMW1 series air circuit breakers:

• OEM Brand Customization: Custom silk-screen logo, rating label and model marking on product body and controller for branded resale.
• Configuration Customization: 3P/4P, drawout/fixed type, different breaking capacity grades and controller functions according to project requirements.
• Accessory Customization: Shunt release, under-voltage release, auxiliary contacts, alarm contacts, closing coil and other accessories can be configured on demand.
• Communication Protocol Adaptation: Adapt to customer-specified communication protocols and system platforms to support integration with SCADA and BMS systems.
• 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 industrial and infrastructure project orders.

Share your required current rating, pole configuration, installation type and accessory requirements, our engineers will recommend the most suitable ACB solution within 24 working hours.

FAQ

Q1: What is the difference between air circuit breaker (ACB) and moulded case circuit breaker (MCCB)?

A: ACB is mainly used for main incoming and bus tie of low-voltage distribution systems, with higher current rating (usually 630A and above), higher breaking capacity and richer protection & control functions. MCCB is used for feeder circuits, with lower current range and more compact size.

Q2: What is the benefit of drawout type ACB?

A: Drawout type ACB can be racked in and out of the chassis. It provides an isolated position where the breaker is fully disconnected from both line and load side, allowing safe maintenance and replacement without powering off the main busbar, greatly reducing downtime.

Q3: What functions does the intelligent controller have?

A: The microprocessor controller provides comprehensive protection (overload, short circuit, ground fault, under/over voltage, etc.), real-time electrical measurement, energy metering, fault event recording and parameter setting. It also supports communication for remote monitoring.

Q4: Can this ACB be monitored and controlled remotely?

A: Yes. It is equipped with standard communication interface and supports Modbus RTU protocol. It can be connected to SCADA or power management system to realize remote status monitoring, remote opening and closing and parameter setting.

Q5: What standard does LMW1 ACB comply with?

A: It is designed and fully type tested in accordance with IEC 60947-2 international standard for low-voltage air circuit breakers, and also meets GB/T 14048.2 national standard.

Q6: Do you support OEM private label service for distributors?

A: Yes, we support custom logo and marking on the breaker body and controller panel. A certain MOQ applies for OEM service.

Q7: What pole and installation options are available?

A: Standard options include 3-pole and 4-pole, drawout type and fixed type. Different breaking capacity grades and controller versions are also available to match different project requirements.

Package Content

1 × LMW1 Series Intelligent Air Circuit Breaker 1 × Product Manual & Test Certificate 1 × Accessory Kit