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series thermal magnetic type double-breake

China Suppliers Factory Direct Thermal Magnetic MCCB 400A 500A 630A 3/4 Poles 400V/690V Double-Breaker

Rated Current: Available in 400A, 500A, and 630A options, our high-performance circuit breakers are designed to ensure maximum reliability for your electrical systems.

Number Of Poles: Choose between 3P and 4P configurations to meet your specific requirements, providing flexibility in various applications.

Rated Working Voltage: Our circuit breakers support rated working voltages of 400V and 690V, making them suitable for a wide range of industrial operations.

As a leading factory and supplier in China, we prioritize quality and efficiency in our manufacturing processes, ensuring our circuit breakers meet international standards while providing exceptional performance. Trust our products for your electrical safety needs.

Product Detail

MCCB Highlights

The reasonable structure design of moving and fixed contacts makes the short circuit peak value and energy of this series of products I²t much smaller than expected.

Working Principle

The current flows in from the fixed contact 1, and flows out from the fixed contact 2, through the moving, fixed silver contact and the moving contact. The moving contact quickly disconnects under the action of strong electric repulsion force (Holm force and Lorentz force) to improve the breaking speed.

Air Blowing Design

When the short circuit large current occur in the circuit, the gas producing parts will generate other gas under the high temperature of the arc, the air pressure in the contact unit box increases rapidly, and a high-speed air flow can be formed through the air outlet of the arc extinguishing chamber, which can effectively extinguish the arc.

ARM5

Frequently Asked Questions (FAQ)

How does the structural design of the ARM5 MCCB benefit electrical systems?

The reasonable structure design of moving and fixed contacts significantly reduces the short circuit peak value and I²t energy of this series of products, making it much smaller than expected.

What is the working principle of the contacts during current flow?

Current flows into fixed contact 1, and exits through fixed contact 2 via the moving, fixed silver contacts. Under strong electric repulsion, the moving contact disconnects rapidly.

Which forces drive the fast disconnection of the moving contact?

The rapid disconnection of the moving contact is driven by strong electric repulsion forces, specifically the Holm force and Lorentz force, which greatly improve the breaking speed.

How does the air blowing design assist in arc extinguishing?

During a short circuit, high arc temperatures cause gas-producing parts to release gas. This rapidly increases air pressure in the contact unit box, creating a high-speed air flow through the arc extinguishing chamber to extinguish the arc.

What materials are used for the contacts in this series?

This series of MCCB products utilizes high-performance moving and fixed silver contacts to ensure reliable conductivity and rapid response during short circuits.