AC 690V Molded Case Breaker

What Is a AC 690V Molded Case Breaker?

An AC 690V Molded Case Breaker is a high-voltage protection device designed to safeguard electrical circuits from overloads, short circuits, and faults. Unlike standard 400V breakers, this unit is engineered to handle higher voltage levels, making it ideal for reducing cable sizes and improving energy efficiency in heavy industrial and large commercial applications.

Product specification

Key Features and Technical Specifications

Voltage and Capacity

• Rated Voltage: 690V AC (50/60Hz).
• Short-Time Withstand Current (Icw): Rated at 85 kA/1s to 100 kA/1s, ensuring the unit remains intact during short-circuit peaks.
• Service Breaking Capacity (Ics): 75% to 100% of Icu, allowing the breaker to return to operation without maintenance after clearing a fault.

Current Ratings

Available in various frame sizes, including high-current models up to 1250A, suitable for main distribution feeders.

Trip Units

Equipped with intelligent trip units offering staged protection:

• Long-time delay: For overload protection (inverse-time tripping).
• Short-time delay: For selective coordination during partial short circuits.
• Instantaneous operation: For critical short-circuit interruption (15ms–30ms total breaking time).

Standards

Fully compliant with IEC 60947-2 and GB standards, ensuring global compatibility and safety.

Key Advantages

Why choose our AC 690V Molded Case Breaker?

• Superior Stability: High Icw rating guarantees dynamic and thermal stability against sudden short circuits.
• Uninterrupted Power: High Ics capability means the breaker can handle maximum faults and continue working, minimizing downtime.
• Selective Protection: Precise trip settings ensure only the faulty circuit is isolated, keeping the main line energized.

Applications

Our breakers are essential for central power distribution in demanding environments:

• Heavy Industry: Chemical plants, steel mills, and automobile manufacturing facilities.
• Critical Infrastructure: Central power rooms in major hospitals and airport terminals.
• Large Buildings: Protecting sensitive equipment rooms and distributing power to entire building wings.

Why Choose Pugao Electric?

As a professional Manufacturer in China, we believe advanced equipment is the foundation of quality.

• Intelligent Manufacturing: We use automated winding machines and computer-controlled precision injection molding systems.
• Consistent Quality: Key bolts are torqued with calibrated tools, and every unit is tested for stroke, contact pressure, and full-load operation.
• Fast Delivery: Our efficient production lines allow us to deliver orders quickly without compromising on performance.

FAQ

What is the breaking capacity of a 690V AC MCCB?

Our units typically feature an ultimate breaking capacity (Icu) of up to 100kA and a service breaking capacity (Ics) of 75-100% of Icu.

What current ratings are available for 690V MCCBs?

We offer a wide range of ratings, typically from 100A up to 1250A or 1600A, depending on the frame size.

What are the common trip types?

Common types include Thermal-Magnetic (TM) for general use and Electronic (Microprocessor-based) for precise protection and communication.

Are 690V breakers suitable for DC?

Generally, no. AC breakers rely on current zero-crossing to extinguish arcs. DC systems require specific DC-rated breakers unless the AC breaker is explicitly derated and certified for DC use.

Where are 690V MCCBs used?

They are used in heavy industrial distribution, renewable energy (solar/wind), and large commercial facilities to reduce cable costs and improve efficiency.

What is the difference between a 400V and 690V MCCB?

A 690V MCCB has higher insulation strength and arc-quenching capabilities to handle the higher voltage stress safely.

What does 3-pole and 4-pole mean?

3-pole breakers protect three phases (L1, L2, L3). 4-pole breakers protect three phases plus the neutral (N) conductor.