800A High Capacity AC Molded Case Circuit Breaker

What Is a 800A High Capacity AC MCCB?

The 800A High Capacity AC Molded Case Circuit Breaker is a high-performance molded case circuit breaker used to protect electrical systems from overloads and short circuits in large-scale power distribution. It operates through a thermal-magnetic or electronic trip unit that detects abnormal current and quickly disconnects the circuit, ensuring equipment safety and system stability.

Key Advantages

• High Current Capacity: Rated at 800A for heavy industrial and infrastructure applications
• Fast Fault Response: Short-circuit interruption within milliseconds for maximum protection
• Advanced Arc Extinguishing: Multi-layer steel grid system ensures safe and rapid arc suppression
• Superior Conductivity: T2 copper busbars and silver-based contacts reduce energy loss
• Strong Thermal Performance: Optimized terminal design improves heat dissipation
• Durability: High-quality 800A High Capacity AC Molded Case Circuit Breaker materials ensure long service life and stable operation

Technical Specifications

• Rated Current: 800A
• Poles: 3P
• Rated Voltage: AC 400V / 415V
• Short-Time Withstand Current: 65kA – 100kA (1s)
• Breaking Capacity: High capacity for industrial fault conditions
• Trip Type: Thermal-magnetic / Electronic optional
• Response Time: ≤ 15 ms for short circuit protection
• Material: Copper conductors, silver alloy contacts, flame-retardant housing

FAQ

Where are they used?

• The 800A High Capacity AC Molded Case Circuit Breaker is widely used in heavy industry, power plants, substations, and large commercial buildings.
• Common applications include water treatment systems, rail transit, and main distribution panels.
• Provides core protection for high-load and critical power systems.

What are the main functions?

• Overload protection to prevent overheating and equipment damage
• Short circuit protection with rapid fault interruption
• Electrical isolation for safe maintenance and operation
• Ensures stable and continuous power distribution

What accessories are available?

• Auxiliary contacts for status monitoring
• Shunt trip for remote tripping control
• Under-voltage release for voltage protection
• Motorized operating mechanism for automation systems

Can they be used outdoors?

• Yes, when installed in appropriate weatherproof enclosures
• Protection level can be enhanced with IP-rated cabinets
• Suitable for outdoor substations and infrastructure projects

What is the difference between frame (AF) and trip (AT)?

• AF (Ampere Frame): Maximum current capacity of the breaker frame
• AT (Ampere Trip): Actual current rating at which the breaker trips
• Example: 800AF frame with adjustable trip settings below 800A

What is the significance of the 100% rating?

• Indicates the breaker can carry 100% of its rated current continuously
• Ensures stable performance without derating under normal conditions
• Important for systems with constant high load demand

What are common standards?

• IEC 60947-2 for low-voltage circuit breakers
• ISO9001 for quality management systems
• Other certifications may include CE and related international standards

Why Choose Pugao

• Professional China Supplier with strong manufacturing experience
• Advanced production equipment and strict quality control system
• Certified with ISO standards and international testing compliance
• Reliable global supply with stable product performance
• One-stop service including design, production, and technical support