ACB Air Circuit Breaker MCCB Main Switch Circuit Breakers 3 Phase 1250A~6300A

The Universal Series Air Circuit Breaker (ACB) is the ultimate protection and control solution for high-capacity low-voltage distribution systems. Operating at rated voltages up to 1000V and currents up to 6300A, this ACB is engineered for the most demanding environments, including power plants, mining operations, and large-scale industrial complexes.

Whether utilized as a Generator Circuit Breaker or the main incoming switch for a building’s low-voltage substation, our ACB series provides exceptional short-circuit breaking capacity and selectivity. Equipped with an intelligent micro-processor based trip unit, it ensures that your power grid is protected against overloads, short-circuits, and earth faults with precision and speed.

• Intelligent Trip Unit (Micro-processor): Features advanced LSI (Long-time, Short-time, Instantaneous) and G (Ground fault) protection. The digital display allows for real-time monitoring of current, voltage, and fault history.

• High Short-Time Withstand Current (Icw): Designed to handle massive thermal and mechanical stresses during faults, ensuring system stability and selective coordination between upstream and downstream breakers.

• Modular Draw-out Design: Available in both Fixed and Draw-out types. The draw-out version allows for easy maintenance and replacement of the breaker unit without disconnecting the primary busbars.

• Optimized Arc Extinguishing System: Utilizing a multi-plate arc chute design, the ACB rapidly splits and cools high-energy arcs, minimizing contact erosion and ensuring a high electrical lifespan.

• Grid-Ready Connectivity: Supports RS485 communication protocols (Modbus), allowing for seamless integration into Building Management Systems (BMS) or SCADA for remote monitoring and operation.

1. Main Power Distribution: Centralized incoming protection for low-voltage substations in hospitals, data centers, and airports.

2. Generator Protection: High-capacity circuit breakers for large diesel and gas generator sets, providing reliable fault isolation.

3. Heavy Industry: Primary switchgear for steel mills, petrochemical plants, and manufacturing facilities with high current demands.

4. Maritime & Offshore: Robust power management for shipboard power systems and offshore oil platforms (Marine-certified versions available).

• Silver-Alloy Power Contacts: We use premium silver-tungsten alloy contacts to ensure low contact resistance and prevent welding during high-current operations.

• Robust Motorized Options: Can be equipped with high-torque motor operators and shunt releases for automated remote switching and load shedding.

• Zero-Arc Distance Construction: Advanced internal layout minimizes the arc-venting distance, allowing for more compact switchboard designs and reduced safety clearances.

• Comprehensive Testing: Every ACB undergoes rigorous factory testing, including mechanical sequence tests and power-frequency withstand tests, ensuring 100% field reliability.

Q: What is the benefit of the Draw-out type vs. the Fixed type?

A: The Draw-out type allows the breaker to be physically isolated from the busbars for safe inspection or replacement without de-energizing the entire panel. It also provides a visible isolation gap for maintenance safety.

Q: Does this ACB support remote tripping?

A: Yes. Every unit can be fitted with a shunt trip (MX) and an under-voltage release (MN), allowing for emergency stop integration and remote control.

Q: Can I customize the protection settings on-site?

A: Absolutely. The intelligent controller features an easy-to-use interface (LCD or LED) where you can adjust trip thresholds and time delays to match your specific coordination study.

HMM1 plastic shell type circuit breaker, suitable for AC 50HZ, rated voltage 690V, rated working current from 63A to 800A distribution network circuit, used to distribute power and protect lines and power equipment from overload, short circuit, undervoltage and other faults damage. At the same time, it can also be used as the motor's infrequent start and overload, short circuit, undervoltage protection.

HMM1 circuit breaker has the characteristics of small size, high breaking capacity, short fly-arc, beautiful appearance, can be installed vertically, can also be installed horizontally, but also has the isolation function, is a user's favorite product.