Introduction
In modern electrical distribution systems where reliability meets scalability, the 1250A Universal Power Circuit Breaker stands as a versatile and intelligent solution. Designed as the workhorse for main power distribution, this breaker combines substantial interrupting capacity with advanced electronic protection in a single, robust package. It serves as the critical protection point for transformer secondaries, main distribution panels, and large-capacity feeders, ensuring system integrity and operational continuity for factories, large commercial complexes, and municipal infrastructure.

Core Capabilities & Advantages

1. Robust Protection Performance
Feature: Engineered with a reliable magnetic blowout arc quenching system and fast-operating mechanism, achieving an interrupting capacity (Icu) of 85kA at 400V. Features adjustable thermal-magnetic or advanced electronic protection functions.
Benefit: Provides dependable defense against overloads and short-circuits, protecting valuable downstream equipment and preventing widespread system downtime. The high breaking capacity ensures it can handle the fault levels present in modern power networks.

2. Intelligent Electronic Trip Unit
Feature: Equipped with a user-configurable digital trip unit that provides precise long-time, short-time, and instantaneous protection settings. Basic models include load current monitoring, while advanced versions offer energy metering (kWh) and event logging.
Benefit: Enables customized protection coordination with downstream devices, improving system selectivity. The metering functionality provides valuable operational data without requiring additional meters.

3. Operational Flexibility & Safety
Feature: Available in both fixed and draw-out designs. The draw-out version features clear “Connected-Test-Isolated” positions with mechanical interlocks to ensure safe racking operations.
Benefit: Simplifies maintenance and testing procedures. The draw-out design allows for quick isolation and inspection without disturbing main bus connections, minimizing system downtime during servicing.

4. Connectivity & System Integration
Feature: Offers optional communication modules supporting industry-standard protocols like Modbus RTU over RS485. This enables integration with building management systems (BMS) or supervisory control systems.
Benefit: Brings basic smart grid functionality to your distribution system, allowing for remote status monitoring, alarm management, and data collection for energy analysis.

Technical Specifications

Parameter	Specification
Frame Size	1250A
Rated Current (In)	Adjustable 400-1250A
Breaking Capacity (Icu)	85kA at 400V AC, 50Hz
Rated Operational Voltage (Ue)	400/690V AC
Number of Poles	3P or 4P
Trip Unit Type	Electronic (Standard) / Advanced (Optional with metering)
Protection Functions	L, S, I, G (Ground fault optional)
Communication	Optional Modbus RTU (RS485)
Mechanical Life	10,000 operations (draw-out mechanism)
Standards Compliance	IEC 60947-2, GB 14048.2

Primary Applications

• Main Incoming Protection: Primary circuit protection for 1000-1600kVA transformer secondaries.
• Bus Tie Applications: Sectionalizing switchgear in dual-fed systems for improved supply availability.
• Large Feeder Protection: For high-capacity loads such as central chillers, large motor groups, or production line power supplies.
• Commercial & Industrial Distribution: Main distribution boards in shopping malls, hospitals, manufacturing plants, and water treatment facilities.

Value Proposition

1. Balanced Performance & Cost Efficiency
Offers the essential features required for reliable main distribution protection at a competitive price point, delivering excellent value for medium to large-scale projects.

2. Simplified System Management
The combination of adjustable protection settings, basic monitoring, and optional communication provides valuable system insight without complex implementation.

3. Proven Reliability & Serviceability
Built with durable components and designed for straightforward maintenance, ensuring long-term reliability and reduced total cost of ownership through extended service intervals.

Installation & Support

Professional Configuration Recommended: Proper coordination study and settings adjustment by qualified personnel are advised to optimize system performance.

Comprehensive Documentation: Detailed installation manuals, application guides, and technical specifications are provided to support proper deployment.

Service Network: Backed by accessible technical support and available spare parts to ensure continued operation throughout the product lifecycle.