At 800 amps, the integrity of every conductor is vital. This MCCB provides robust, individually calibrated protection for all three phase lines and the neutral conductor. The fourth pole is not merely a switch; it’s a fully functional protective element. This is essential in systems with significant non-linear loads, where harmonic currents can turn the neutral into a dangerous, overheating conductor. The 800A 4-pole YEM3Z eliminates this risk entirely. In the event of any fault, it guarantees the simultaneous disconnection of all four poles, ensuring the system is completely de-energized and safe for personnel.

Key Features & Benefits:

• Uncompromising Four-Pole Protection: Provides complete overload and short circuit protection for L1, L2, L3, and Neutral. This is the definitive safety standard for critical TPN systems, preventing neutral-related hazards and ensuring full isolation as required by many electrical codes and applications (e.g., ATS).
• Massive 800A Capacity: Built to be the heart of your power distribution system, this MCCB can handle the main incoming supply for the largest facilities, protecting the entire electrical infrastructure from faults at the source.
• Advanced Electronic Trip Unit with Full Adjustability: This premium breaker features a sophisticated electronic trip unit, allowing for precise configuration of multiple protection parameters (Long-Time, Short-Time, Instantaneous, and often Ground Fault). This enables perfect system coordination (selectivity), minimizing the impact of faults and maximizing uptime.
• Superior Breaking Capacity: Engineered to withstand and extinguish the most powerful electrical faults, the 800A YEM3Z has an exceptionally high kA rating. It can safely manage the immense energy of a short circuit, preventing catastrophic damage to your switchgear and connected equipment.
• Designed for Ultimate Reliability and Longevity: The MCCB is constructed from high-grade, durable materials to ensure flawless performance over a long service life. Its robust design withstands the thermal and mechanical stresses inherent in high-current applications.
• Ready for Smart Grid Integration: Often equipped with communication modules (e.g., Modbus, Profibus), this MCCB can integrate seamlessly into a centralized Power or Building Management System. This provides real-time data on energy consumption, power quality, and breaker status for advanced diagnostics and energy efficiency strategies.
• Globally Certified for Peace of Mind (IEC 60947-2): Conformance with the highest international standards for safety and performance is a given. This certification is your assurance that you are installing a product of world-class quality and reliability.

The 800AMP 4-Pole YEM3Z MCCB is more than a protective device; it is the ultimate assurance of power integrity. It delivers the strength to manage colossal electrical loads and the intelligence to protect every part of your system with surgical precision. For professionals who oversee mission-critical infrastructure, this breaker is the final word in safety, reliability, and control.

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Managing 800 amps of current is a task that leaves zero margin for error. A fault at this level is not a minor inconvenience; it’s a potentially catastrophic event that can lead to explosive equipment damage, extensive fires, and life-threatening safety risks. The YEM3Z 800A MCCB is designed to stand as a formidable barrier against such events. It provides constant, vigilant protection against both sustained overloads and instantaneous short circuits, automatically cutting power in the blink of an eye to contain faults before they can escalate.

Key Features & Benefits:

• Immense 800A Power Rating: This MCCB is purpose-built for the most demanding applications, serving as the main incoming breaker for entire facilities or protecting the largest individual loads, such as industrial furnaces, chillers, or heavy-duty motors.
• Fully Adjustable Electronic Trip Unit: At this power level, precision is key. This MCCB is typically equipped with an advanced electronic trip unit offering a wide range of adjustable settings: long-time (overload), short-time, and instantaneous (short circuit) protection. This allows for meticulous system coordination and selectivity, ensuring maximum operational continuity.
• Exceptional Fault Interruption (High kA Rating): The 800A YEM3Z boasts an extremely high breaking capacity, enabling it to safely interrupt the massive energy released during a major short circuit. This capability is crucial for protecting the entire electrical infrastructure from the violent forces of high-current faults.
• Built for Maximum Reliability: Encased in a high-strength, arc-resistant thermoset material, this MCCB is designed for supreme durability. Its robust mechanical structure and high-quality internal components guarantee a long service life with consistent, reliable performance.
• Advanced Features for Modern Power Systems: Beyond basic protection, this breaker often includes communication capabilities (e.g., Modbus) for integration with modern Power Management Systems. This allows for remote monitoring of current, status, and trip history, facilitating proactive maintenance and energy management.
• Designed for Ease of Use and Safety: Despite its size, the 800A YEM3Z is designed for straightforward installation and maintenance. It features clear status indicators, a test function to verify the trip mechanism, and is compatible with a range of accessories like motor operators for remote control.
• Certified to the Highest International Standards (IEC 60947-2): Rigorous testing and certification to global standards provide ultimate confidence in its safety and performance. This is a product engineered to meet the demands of professionals who require the best.

The 800AMP 3-Pole YEM3Z MCCB is the ultimate solution for protecting your most significant electrical assets. It combines raw power-handling capability with intelligent, highly customizable protection. When your operations depend on a reliable and safe high-current power supply, this breaker delivers the performance and peace of mind you need.

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At 630 amps, the energy is immense, and so is the responsibility. This 4-pole MCCB not only protects the three main phase conductors but also provides dedicated overload and short circuit protection for the neutral line. This is critically important in modern facilities where non-linear loads (from server farms, VFDs, or LED lighting) can induce dangerous harmonic currents in the neutral, creating a hidden fire risk. Furthermore, for any system with an Automatic Transfer Switch (ATS), switching the neutral is often a mandatory safety requirement. The 630A 4-pole YEM3Z ensures that in any fault condition, all four conductors are disconnected simultaneously, providing complete and unequivocal system isolation.

Key Features & Benefits:

• Total System Protection: By monitoring and protecting all four poles, this MCCB eliminates risks associated with neutral currents and ensures 100% isolation. This is the gold standard for safety in critical power applications, protecting both equipment and personnel.
• Extreme High-Current Capacity: With its 630A rating, this breaker is built to serve as the main protective device for large industrial complexes, hospitals, and other facilities where power continuity is non-negotiable. It confidently manages the primary power feed, safeguarding the entire downstream electrical network.
• Sophisticated and Adjustable Protection: This premium MCCB typically includes adjustable thermal (overload) and magnetic (short circuit) trip settings. This allows for precise system coordination, ensuring that in the event of a fault, the breaker closest to the problem trips first, leaving the rest of the system powered and operational.
• Massive Breaking Capacity: Engineered to handle the most extreme electrical events, the 630A YEM3Z boasts a very high breaking capacity (kA rating). It can safely interrupt catastrophic short-circuit currents, preventing arc flashes and widespread equipment damage.
• Industrial-Strength Construction: Housed in a durable, high-insulation moulded case, this breaker is designed for longevity in demanding environments. It resists heat, impact, and vibration, ensuring reliable performance year after year.
• Enhanced Serviceability and Integration: Features like a mechanical trip indicator, a front-panel test button, and a full range of available accessories (e.g., motor operators, alarm contacts) allow for easy maintenance and seamless integration into sophisticated building and power management systems.
• Globally Certified Quality (IEC 60947-2): Conforming to top international standards, the YEM3Z series is a globally recognized symbol of engineering excellence. This certification guarantees its performance and safety under the most rigorous conditions.

The 630AMP 4-Pole YEM3Z MCCB is the definitive protection solution for high-capacity TPN systems. It offers the strength to handle enormous power loads and the intelligence to protect every conductor with precision. For engineers and facility managers who demand the highest level of safety and reliability, this breaker is the only choice.

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Operating at 630 amps means managing an incredible amount of electrical energy. The potential for catastrophic failure is proportionately high, making reliable protection an absolute necessity. The YEM3Z 630A MCCB is purpose-built to handle this responsibility. It functions as a smart, automatic switch that continuously monitors the current. If it detects a prolonged overload that could overheat cables and start a fire, or a sudden, violent short circuit that could destroy equipment, it trips in milliseconds—isolating the fault and preserving the integrity of your entire system.

Key Features & Benefits:

• Massive 630A Current Rating: This MCCB is designed for the main incoming power lines of large industrial plants, commercial skyscrapers, and data centers. It provides the immense capacity required to serve as the primary protective device for your entire facility.
• Advanced Adjustable Trip Controls: To ensure precise protection, this class of MCCB typically features adjustable overload (Ir) and short-circuit (Im) settings. This allows engineers to perfectly tailor the breaker’s response curve to the specific load characteristics and to coordinate with downstream breakers for selective tripping, which isolates faults locally and keeps the rest of the facility running.
• Extremely High Breaking Capacity: A breaker’s true strength is measured by its breaking capacity (kA). The 630A YEM3Z is designed to withstand and safely interrupt enormous fault currents, quenching powerful electrical arcs and preventing a single fault from cascading into a full-blown disaster.
• Uncompromising Durability: Built to last, the YEM3Z is housed in a rugged, thermoset moulded case that provides superior insulation and can endure the mechanical and thermal stresses of a high-current environment. Its robust construction ensures a long, reliable service life.
• Designed for Maximum Uptime: Beyond protection, this MCCB is a tool for reliability. Its precise tripping characteristics, combined with features like a clear trip indicator and optional remote monitoring accessories (shunt trips, auxiliary contacts), help maintenance teams diagnose and resolve issues faster, minimizing costly downtime.
• Certified for Global Excellence (IEC 60947-2): Adherence to stringent international standards like IEC 60947-2 is a hallmark of the YEM3Z series. This certification provides undeniable proof of its safety, quality, and reliability, making it a choice trusted by engineers around the world.

The 630AMP 3-Pole YEM3Z MCCB is the definitive choice for protecting high-capacity three-phase systems. It combines sheer power-handling capability with intelligent, customizable protection features. When your operations run on massive electrical loads, you need a circuit breaker that is equally massive in its ability to protect. Secure your facility’s power backbone and ensure operational continuity with the unparalleled strength of the YEM3Z 630A MCCB.

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This MCCB is engineered for the most demanding applications, including primary power feeds for data centers, industrial plants with extensive non-linear loads (like VFDs), and as a main breaker for large standby generators. In these environments, the neutral conductor can carry unexpected currents due to load imbalances or harmonic distortions. A standard 3-pole breaker would leave this hazard unchecked. The 400A 4-pole YEM3Z provides dedicated protection for the neutral, tripping all four poles simultaneously to eliminate any possibility of overheating, fire, or residual voltage, which could endanger personnel and damage sensitive equipment.

Key Features & Benefits:

• Complete TPN System Safeguard: By providing overload and short circuit protection on all four lines, this MCCB ensures total isolation in the event of a fault. This is critical for life-safety systems, changeover switches (ATS), and any application where a floating neutral is not permissible.
• Formidable 400A Capacity: This breaker is designed to be the backbone of your power distribution system. It can handle the main incoming power for large commercial or industrial facilities, protecting the entire downstream network from catastrophic failures originating at the source.
• Customizable Protection Settings: Many models in this class feature adjustable thermal and magnetic trip settings. This allows for precise coordination with other protective devices in the network, enabling you to create a sophisticated, selective protection scheme that minimizes downtime by isolating faults to the smallest possible area.
• Exceptional Breaking Capacity: The ability to handle 400A continuously is matched by an extremely high breaking capacity (kA rating). This means the MCCB can withstand the violent forces of a major short circuit and safely extinguish the arc, protecting your infrastructure from widespread damage.
• Industrial-Grade Durability: The YEM3Z series is built tough. The high-quality moulded case offers excellent insulation, mechanical strength, and resistance to environmental factors, ensuring long-term reliability in any setting.
• Enhanced Operational Features: Designed for professional use, this MCCB includes a clear trip indicator, a test button for verifying trip functionality, and often supports accessories like undervoltage releases or alarm contacts for integration into building management systems (BMS).
• Globally Certified (IEC 60947-2): Rigorous testing to international standards confirms its performance, safety, and reliability. This certification is your guarantee that the product meets the highest industry benchmarks.

The 400AMP 4-Pole YEM3Z MCCB is the ultimate choice for professionals who require absolute control and safety over their high-current electrical systems. It offers the strength to manage immense power and the intelligence to protect every conductor, delivering peace of mind that your most critical operations are secure. Don’t compromise on safety—insist on the comprehensive protection of a 4-pole YEM3Z breaker.

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At 400 amps, the energy flowing through your circuits is immense, and so are the risks. A fault in such a system can lead to devastating consequences, including equipment destruction, prolonged downtime, and severe safety hazards. The 400A YEM3Z MCCB serves as a critical line of defense, offering state-of-the-art protection against both overloads and short circuits. It acts as an automatic, vigilant sentry, ready to disconnect the power in a fraction of a second at the first sign of trouble, thereby preserving your assets and ensuring a safe working environment.

Key Features & Benefits:

• Extreme High-Current Protection: With its 400A rating, this MCCB is built to manage and protect the main power feeds for entire buildings, large motor control centers (MCCs), and the primary outputs of diesel generators. It provides the robust capacity needed for the most demanding electrical loads.
• Adjustable Thermal-Magnetic Trip Unit: This model often features adjustable trip settings, allowing electricians to fine-tune the protection parameters to match the specific requirements of the circuit. This customization ensures optimal protection, minimizing the risk of nuisance tripping while maximizing safety.
• Exceptional Breaking Capacity (kA Rating): A high continuous current rating needs to be backed by an equally high breaking capacity. This MCCB is designed to safely interrupt massive fault currents, preventing the explosive effects of a short circuit and ensuring the device itself remains functional and ready to protect again.
• Superior Durability and Reliability: Constructed with a high-strength, thermoset plastic moulded case, the YEM3Z is resistant to heat, impact, and electrical arcing. This industrial-grade build guarantees a long service life and reliable performance, even in the harshest operating conditions.
• Designed for Professional Use: The breaker includes features that simplify its integration and management, such as clear on/off/trip indicators, a front-panel test button for functional checks, and compatibility with various accessories like shunt trips and auxiliary contacts for remote monitoring and control.
• Compliance with Global Standards (IEC 60947-2): Manufactured and tested in accordance with stringent international standards, the YEM3Z series provides a globally recognized assurance of quality, safety, and performance. This certification means you are investing in a product trusted by professionals worldwide.

The 400AMP 3-Pole YEM3Z MCCB is more than a component; it’s a fundamental part of your facility’s safety and operational strategy. It delivers the heavy-duty performance required to protect significant capital investments and maintain productivity. When you need to safeguard high-current three-phase circuits from the unpredictable nature of electrical faults, trust the proven strength and reliability of the YEM3Z 400A MCCB. Secure your power, secure your business.

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Why is a 4-pole breaker essential? In many modern electrical networks, especially those with a high concentration of electronics, variable frequency drives (VFDs), and fluorescent lighting, the neutral conductor can carry substantial “harmonic” currents. These currents can cause the neutral wire to overheat, posing a significant fire risk that a 3-pole breaker would not detect. Furthermore, in generator-powered or UPS systems, ensuring the neutral is switched along with the phases is crucial for proper operation and safety during changeover. The YEM3Z 250A 4-pole MCCB addresses these challenges head-on by providing fault protection on all four lines and guaranteeing simultaneous disconnection.

Key Features & Benefits:

• Comprehensive TPN Protection: This MCCB offers robust overload and short circuit protection for all four conductors. By monitoring and protecting the neutral line, it prevents overheating caused by harmonic currents and ensures complete isolation in the event of a fault.
• High-Current 250A Rating: Perfectly suited for main incoming lines, distribution circuits in large facilities, and protecting heavy-duty equipment, this MCCB confidently manages substantial electrical loads, ensuring the smooth operation of your most power-intensive machinery.
• Advanced Thermal-Magnetic Tripping: The precision-engineered trip unit provides dual-action protection. A time-delayed thermal trip handles gradual overcurrents, preventing premature tripping from motor startups, while the instantaneous magnetic trip responds to dangerous short circuits in milliseconds.
• Exceptional Breaking Capacity: This breaker is built to handle the immense energy of a major electrical fault. Its high breaking capacity (kA rating) ensures it can safely interrupt the current, protecting downstream assets from catastrophic damage and maintaining the integrity of the electrical panel.
• Rugged, Industrial-Grade Construction: The YEM3Z series is renowned for its durability. Housed in a tough, non-conductive, and flame-retardant moulded case, this MCCB is designed to withstand the rigors of industrial environments, providing reliable service for years to come.
• User-Friendly Design and Maintenance: Featuring a clear trip indicator, a front-accessible test button, and easy-to-wire terminals, the breaker is designed for both ease of installation and straightforward maintenance, reducing downtime and labor costs.
• Certified to IEC 60947-2: Rigorously tested to meet and exceed international standards for safety and performance, this certification provides the ultimate assurance that you are installing a world-class protective device.

The 250AMP 4-Pole YEM3Z MCCB is the ultimate safeguard for your critical high-current TPN systems. It delivers peace of mind by ensuring complete electrical isolation, protecting against hidden neutral-line dangers, and guaranteeing the safety of your personnel and equipment. For professionals who demand the highest standard of protection, this MCCB is the only choice.

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Power systems rated for 250 amps are significant investments, and protecting them is paramount. This YEM3Z MCCB acts as a vigilant guardian, continuously monitoring the circuit for signs of overloads and short circuits. An overload, where the current slightly exceeds the rated capacity for an extended period, can cause wires to overheat, insulation to melt, and create a serious fire risk. A short circuit, a sudden and massive surge of current, can cause explosive damage to equipment. This MCCB is designed to intelligently detect and instantly react to both threats, disconnecting the power in milliseconds to prevent damage and ensure safety.

Key Features & Benefits:

• High-Current Capacity: With a 250A rating, this MCCB is perfectly suited for main distribution boards, sub-main circuits, and protecting large motors, HVAC systems, and other heavy-duty equipment that define modern industry.
• Reliable Dual-Trip Mechanism: The advanced thermal-magnetic trip unit offers two layers of defence. The thermal protection provides an inverse time-delay response, tolerating harmless inrush currents from motors while tripping on sustained overloads. The magnetic protection offers instantaneous tripping on high-level fault currents, safeguarding against the most dangerous electrical events.
• Built for Extreme Conditions: The YEM3Z MCCB is encased in a robust, high-dielectric strength, and flame-retardant moulded housing. This rugged construction ensures reliable operation in challenging industrial settings with vibrations, temperature fluctuations, and dust.
• Superior Breaking Capacity: This breaker is not just rated for 250A of continuous current; it’s also designed with a high breaking capacity (kA rating) to safely interrupt massive fault currents without failure. This ensures the protection of your entire electrical system and the safety of your personnel.
• Simplified Installation and Operation: Designed with the installer in mind, the YEM3Z MCCB features easily accessible terminals and a compact form factor for its power class, facilitating a smooth fit into switchboards and panels. The clear on/off/trip indication and front-panel test button make it easy to operate and maintain.
• Internationally Certified Quality: Meeting the strict requirements of IEC 60947-2, this MCCB stands as a testament to quality manufacturing and engineering excellence. This certification ensures it performs reliably and safely, giving you confidence in your circuit protection strategy.

The 250AMP 3-Pole YEM3Z MCCB is the definitive solution for protecting high-power three-phase circuits. It provides the strength, intelligence, and reliability needed to manage significant electrical loads safely. Whether you’re safeguarding a manufacturing line, a commercial building’s power backbone, or a large-scale generator, this circuit breaker delivers the performance you can trust. Upgrade your system’s safety and reliability by investing in the proven power of the YEM3Z series.

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The YEM3Z 125A 4-pole model extends the trusted reliability of its 3-pole counterpart by adding a fourth protective pole for the neutral conductor. In many modern electrical networks, harmonic currents or imbalanced loads can cause the neutral line to carry significant current, creating a potential fire hazard and a risk to sensitive electronics. This 4-pole MCCB ensures that in the event of a fault, all four lines—the three phases and the neutral—are simultaneously disconnected, guaranteeing full circuit isolation and eliminating any risk of back-feeding or residual live connections.

Key Features & Benefits:

• Full TPN System Protection: Unlike 3-pole breakers, this model provides dedicated overload and short circuit protection for the neutral line, making it essential for systems with non-linear loads (e.g., computers, VFDs) that can generate harmful harmonic distortions.
• Advanced Thermal-Magnetic Tripping: At its core, the YEM3Z MCCB features a precision-engineered thermal-magnetic trip unit. It offers a time-delayed thermal response to protect against gradual overcurrents and an instantaneous magnetic trip to combat severe short circuits, providing dual-action defence for your entire electrical infrastructure.
• Exceptional Durability and Safety: Constructed from high-grade, impact-resistant, and flame-retardant materials, the moulded case provides excellent insulation and mechanical strength. This rugged build ensures long-term performance even in harsh industrial environments.
• High Breaking Capacity: Engineered to withstand and interrupt substantial fault currents, this MCCB provides reliable protection without fail. Its high breaking capacity means it can handle the intense energy of a major short circuit, protecting downstream equipment from damage and ensuring the breaker itself remains operational.
• Clear Operational Status and Easy Testing: The device includes a clear trip indicator that immediately shows if the breaker has been tripped by a fault, distinguishing it from a manual switch-off. A built-in test button allows maintenance personnel to periodically verify the functionality of the trip mechanism, ensuring it’s always ready to perform.
• Certified for Global Standards: Adhering to rigorous international safety and performance standards like IEC 60947-2, the YEM3Z series is a globally recognized mark of quality. This compliance provides peace of mind that you are investing in a product tested for the most demanding scenarios.

The 125AMP 4-Pole YEM3Z MCCB Is more than just a circuit breaker; it’s a comprehensive safety solution for your most critical power systems. By providing full isolation and protection for all conductors, it enhances safety, ensures regulatory compliance, and protects sensitive electronics from damage. Ideal for generator power distribution, IT infrastructure, and any application requiring neutral protection, this MCCB is the definitive choice for professionals who refuse to compromise on safety.

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The YEM3Z series is synonymous with quality and durability. This 125A 3-pole model is specifically designed to protect three-phase electrical systems, making it the ideal choice for a wide range of applications, including commercial buildings, industrial machinery, and medium-sized generator sets. Its primary function is to automatically interrupt the electrical flow the moment it detects a fault, whether it’s a sustained overload drawing excessive current or a sudden, dangerous short circuit. By doing so, it protects not only the machinery connected to the circuit but also ensures the safety of personnel and prevents potential fire hazards.

Key Features & Benefits:

• Robust Overload and Short Circuit Protection: The YEM3Z MCCB combines thermal and magnetic trip mechanisms. The thermal element provides a delayed response to minor overloads, preventing nuisance tripping while still protecting wires from overheating. The magnetic element offers an instantaneous response to high-current short circuits, immediately cutting power to avert disaster.
• High Breaking Capacity: Built to handle significant fault currents, this MCCB has a high breaking capacity, ensuring it can safely interrupt even the most severe electrical faults without sustaining damage itself. This resilience guarantees its readiness to protect your system time and time again.
• Durable and Compact Design: Housed in a rugged moulded case made from high-strength, flame-retardant thermosetting plastic, the YEM3Z is built to last. Its compact design allows for easy integration into existing electrical panels and switchgear, making it a versatile solution for both new installations and system upgrades.
• Easy Installation and Maintenance: Featuring clearly marked terminals and a user-friendly design, the installation process is straightforward for qualified electricians. The front-facing trip indicator and test button allow for easy verification of the breaker’s operational status, simplifying routine maintenance checks.
• Compliance with International Standards: Manufactured to meet stringent international standards such as IEC 60947-2, the YEM3Z series guarantees quality, safety, and reliability. This certification ensures that you are installing a product that has been rigorously tested for performance under demanding conditions.

Whether you’re upgrading a power distribution panel, installing a new generator, or seeking to enhance the safety of your industrial facility, the 125AMP 3-Pole YEM3Z MCCB offers the perfect balance of performance, reliability, and value. Protect your investments, ensure operational continuity, and maintain the highest safety standards with this premier circuit protection device. Don’t wait for an electrical fault to highlight a weakness in your system. Secure your circuits today.

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