What Is The Breaking Capacity Of 630a Mccb

When you’re choosing a 630A MCCB for your electrical distribution system, understanding its breaking capacity is crucial. It determines how safely the circuit breaker can interrupt fault currents and protect your equipment. In this guide, you’ll learn everything you need to know about 630A MCCB breaking capacity and how to make the right choice.

What Is a 630A MCCB?

A Molded Case Circuit Breaker (MCCB) is a protective device designed to automatically disconnect electrical circuits during overloads or short circuits.
A 630A MCCB means the breaker is rated to handle up to 630 amperes of continuous current without tripping under normal conditions.

This type of MCCB is commonly used in industrial power distribution panels, commercial buildings, and large electrical systems where higher current ratings are required. It not only provides circuit protection but also ensures system reliability and safety during faults.

Typical Breaking Capacity of a 630A MCCB

The breaking capacity, also known as short-circuit interrupting capacity, defines the maximum fault current the MCCB can safely interrupt without damage.

For a 630A MCCB, typical breaking capacities are:

• 25kA at 415V AC (standard type)
• 35kA or 50kA at 415V AC (enhanced performance type)
• Up to 70kA or higher for heavy-duty models

The appropriate breaking capacity depends on the expected fault current at the installation point. Choosing an MCCB with a higher breaking capacity ensures greater protection, especially in systems with high short-circuit levels.

How to Choose the Right 630A MCCB Based on Breaking Capacity

When selecting a 630A MCCB, consider the following steps:

1. Determine System Fault Current:
   Calculate the maximum short-circuit current that could occur in your system. Your MCCB’s breaking capacity should exceed this value for safe operation.
2. Check the Operating Voltage:
   Breaking capacity ratings vary with voltage levels. Always confirm that the MCCB’s rated voltage matches your application (e.g., 415V AC, 690V AC).
3. Consider Application Type:
   Industrial environments often require higher breaking capacities due to stronger fault currents compared to commercial or residential installations.
4. Verify Standards Compliance:
   Ensure the MCCB conforms to IEC 60947-2 or equivalent standards for international safety compliance.
5. Evaluate Product Quality and Brand Reliability:
   Trusted brands like NUOMAK offer tested and certified MCCBs that maintain stability even under harsh operating conditions.

Common Mistakes When Selecting MCCBs

Even experienced engineers sometimes make errors when choosing MCCBs. Avoid these common mistakes:

• Selecting an MCCB with too low a breaking capacity for your system’s fault level.
• Ignoring derating factors such as temperature or installation conditions.
• Mixing products from different brands without proper coordination studies.
• Choosing low-cost MCCBs that lack certification or quality assurance.

A well-chosen 630A MCCB ensures both protection and longevity for your electrical infrastructure.

Why Choose NUOMAK 630A MCCB

NUOMAK 630A MCCBs are designed for reliable performance, compact size, and high breaking capacity.
They are engineered according to IEC 60947-2 standards, ensuring top-level protection against overloads and short circuits.

Key advantages include:

• Wide breaking capacity range (25kA–70kA)
• Excellent thermal and magnetic trip characteristics
• Strong dielectric strength and contact reliability
• Easy installation and maintenance-friendly design

Whether you need a main switch or protection for distribution feeders, NUOMAK provides MCCBs that deliver dependable performance and safety assurance for every project.

Conclusion

Choosing the right 630A MCCB with proper breaking capacity helps you safeguard equipment, prevent power downtime, and ensure compliance with safety standards. NUOMAK MCCBs combine quality, reliability, and competitive pricing—making them the ideal choice for your industrial or commercial power distribution needs. Contact NUOMAK today to get expert support.

FAQs

1. What does 630A mean in MCCB?
It means the MCCB is rated to carry up to 630 amperes of current continuously without tripping under normal conditions.

2. What breaking capacity should I choose for a 630A MCCB?
It depends on your system’s fault level. Most users choose between 35kA and 50kA at 415V AC, but heavy-duty systems may need higher ratings.

3. Can a 630A MCCB be used as a main switch?
Yes, a 630A MCCB can function as the main switch in power distribution panels, provided it meets the required voltage and breaking capacity ratings.

4. What standards does NUOMAK MCCB comply with?
All NUOMAK MCCBs comply with IEC 60947-2 and undergo rigorous quality testing to ensure reliable protection and long service life.