Description
When managing high-current power systems, especially those with critical uptime requirements or complex loads, leaving the neutral line unprotected is a risk you can’t afford. The 400AMP 4-Pole YEM3Z Moulded Case Circuit Breaker (MCCB) is the definitive solution, providing uncompromising protection for heavy-duty three-phase plus neutral (TPN) electrical systems. It combines a robust 400A capacity with the added safety of a fourth protective pole, ensuring complete system isolation and safeguarding against the full spectrum of electrical faults.
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.
