Moulded Case Circuit Breaker

Moulded Case Circuit Breakers (MCCB): High-Capacity Protection from ABB, Schneider, and Siemens

Moulded Case Circuit Breakers, widely known as MCCBs or Compact Circuit Breakers, are indispensable components in high-current electrical infrastructure. Positioned strategically within main distribution boards, sub-distribution panels, and industrial equipment, the moulded Case Circuit Breaker is designed to provide robust protection against sustained overloads and damaging short circuits in large-scale applications. These devices are critical for systems where standard Miniature Circuit Breakers (MCBs) lack the necessary breaking capacity or current rating. At Stoklink, we feature a premier selection of MCCBs from global leaders like Schneider, ABB, and Siemens, ensuring your industrial and commercial installations are protected by reliable technology.

Essential Moulded Case Circuit Breaker Selection: Ratings, Poles, and Breaking Capacity

The primary function of any moulded Case Circuit Breaker is to interrupt fault currents quickly and safely. Unlike simpler protective devices, modern MCCBs often feature adjustable trip units, offering flexibility in setting long-time (overload) and instantaneous (short-circuit) protection levels. This adjustability is crucial for coordination with other protective devices in complex electrical networks.

Understanding High Amperage Ratings: MCCB 100A to MCCB 800A

The power handling capability of an MCCB determines its application. At Stoklink, you will find ratings engineered for everything from heavy feeders to large motor circuits.

• MCCB 100A and MCCB 250A: These mid-range MCCBs are frequently deployed in sub-distribution boards within commercial buildings, factories, and large residential complexes, balancing compact design with substantial protective power. They are essential for protecting main circuits where currents exceed 63A.

• MCCB 400A and MCCB 800A: Used primarily in main switchboards and feeder circuits, these high-amperage breakers ensure total system integrity. Their large capacity and high breaking ratings are necessary for isolating major faults without impacting the stability of the overall electrical supply.

The breaking capacity (Icu/Ics), measured in kA, is another critical factor. This indicates the maximum fault current the Compact Circuit Breaker can withstand and safely interrupt. For critical industrial applications, selecting an MCCB with a high breaking capacity is non-negotiable to prevent catastrophic equipment failure.

MCCB vs MCB: Choosing the Right Protection Level

A key decision in designing any electrical panel is understanding the difference in application and performance, hence the relevance of MCCB vs MCB. While both devices protect against overcurrent and short circuits, their suitability depends entirely on the required current rating and breaking capacity. Miniature Circuit Breakers (MCBs) typically handle currents up to 63A and have lower breaking capacities (usually up to 10kA), making them ideal for final branch circuits and light residential or commercial loads.

In contrast, the moulded Case Circuit Breaker is designed for higher currents (up to 1600A) and significantly higher fault currents (often 50kA or above). MCCBs serve as the main protection devices upstream of MCBs. The structural design of the MCCB, encased in its insulating housing, ensures that it can safely manage the severe mechanical and thermal stresses associated with interrupting massive fault currents. This higher capacity and robustness are what make the MCCB the standard choice for industrial, infrastructure, and main commercial power distribution.

Top MCCB Brands: The Best of ABB Tmax MCCB, Schneider NSX, and Siemens 3VA

When procuring high-performance circuit protection, the brand reputation directly reflects product quality and certification compliance.

• ABB Tmax MCCB: The ABB Tmax series represents exceptional innovation, offering a wide range of sizes and highly adaptable trip units, from thermal-magnetic (TMD/TMA) to advanced electronic types. The flexibility of the ABB Tmax MCCB makes it a preferred choice for complex industrial coordination needs.

• Schneider NSX MCCB: The Schneider ComPact MCCB NSX range is renowned for its reliability, modularity, and easy integration into existing systems. Features supporting both fixed and draw-out versions, alongside advanced communication capabilities, highlight why the NSX series remains an industry favorite.

• Siemens 3VA: Siemens breakers provide precision engineering, combining compact dimensions with high performance, making them suitable for global installation standards.

Understanding the MCCB Price List and Procurement

When considering the MCCB price list, procurement specialists must look beyond the initial cost. Price variation often reflects the breaking capacity, the complexity of the trip unit (thermal-magnetic vs. electronic), the number of poles, and whether it’s a fixed or draw-out design. Investing in certified, robust moulded case circuit breaker solutions from recognised brands like ABB, Schneider, and Siemens ensures a lower total cost of ownership through maximised uptime and reduced maintenance. Stoklink facilitates this process by offering transparent pricing across high-demand ranges, including solutions suitable for systems requiring an MCCB 250A or larger MCCB 400A protection.

Secure Your System: Explore the Stoklink MCCB Collection

The integrity of your electrical infrastructure relies on definitive, quality protection. Moulded Case Circuit Breakers are the unwavering foundation of any high-current system, offering the performance and reliability needed to guard against catastrophic failure. Stoklink simplifies the procurement process by offering a curated selection featuring the leading brands and all essential amperage ratings, from MCCB 100A through MCCB 800A. You can take advantage of our comprehensive MCCB price list and choose the perfect moulded Case Circuit Breaker (MCCB) solution today.