LMW1-3200 Series 3200A Intelligent Air Circuit Breaker (ACB)

Product Overview

The LMW1-3200 series ACB 3200A is a high-capacity intelligent universal air circuit breaker, serving as the core protection and control device for large low-voltage 3-phase main 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 3200A ACB integrates a high-performance microprocessor protection controller, which not only realizes accurate multi-parameter protection and selective coordination, 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. With rated short-circuit breaking capacities covering 50kA, 65kA and 80kA grades, it adapts to different system fault levels. It is widely applied in large industrial manufacturing plants, commercial complexes, data centers, renewable energy power stations and infrastructure power distribution systems.

Key Product Features

✅ 3200A Frame High-Current Rating Standard ACB 3200A frame size with adjustable rated current settings. Covers main incoming and bus tie applications for large low-voltage distribution systems, meets the capacity requirements of heavy industrial, infrastructure and data center projects.

✅ 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 multi-zone protection parameter setting and fault event recording for accurate selective protection coordination.

✅ Drawout Type with Three-Position Isolation Three-position drawout chassis: connected position, test position and isolated position. The 3200A ACB can be racked out for maintenance without powering off the upstream busbar. Clear mechanical isolation gap ensures personnel safety during overhaul and component replacement.

✅ Electric Stored Energy Operation Mechanism 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 Grades Multiple breaking capacity options: 50kA, 65kA, 80kA. Reliably interrupts maximum short-circuit current at rated voltage. Optimized 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, active power, reactive power, frequency, power factor and cumulative 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 energy 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

Application Scenarios

• Large industrial plant low-voltage main distribution switchgear main incoming breaker
• Large commercial building and shopping mall bus tie and main power protection
• Data center and IDC critical power distribution and bus tie systems
• Photovoltaic, wind power and energy storage grid-connection converging systems
• Infrastructure, hospital and airport central power distribution rooms
• Heavy feeder and bus tie circuits in large 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 ACB 3200A 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 pole configuration, installation type, breaking capacity grade and accessory requirements, our engineers will recommend the most suitable ACB 3200A solution within 24 working hours.

FAQ

Q1: What is an ACB 3200A used for?

A: A 3200A air circuit breaker (ACB) is mainly used for main incoming and bus tie protection of large low-voltage main distribution systems. It carries and breaks 3200A rated current and provides comprehensive protection against overload, short circuit and other electrical faults.

Q2: What is the difference between drawout and fixed type ACB?

A: Drawout type ACB 3200A can be racked in and out of the chassis, providing an isolated position for safe maintenance without busbar power-off. Fixed type is directly bolted in the cabinet, with lower cost for applications requiring less frequent maintenance.

Q3: What protection functions does this 3200A ACB have?

A: The microprocessor controller provides comprehensive protection including long-time overload, short-time delay, instantaneous short circuit, ground fault, under/over voltage, phase loss and phase imbalance. It also supports selective protection coordination.

Q4: Can this ACB 3200A 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 LMW1-3200 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 breaking capacity grades are available for this 3200A ACB?

A: Standard breaking capacity options include 50kA, 65kA and 80kA, which can be selected according to the short-circuit current level of the distribution system.