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Product Overview
Starting a massive 400-Ampere three-phase motor—such as those driving industrial plastic extruders or municipal sewage pumps—generates a violent, temporary magnetic surge that can easily exceed 3000 Amps. Standard breakers will falsely trip, causing catastrophic production halts. The CHNAILE Heavy-Duty 3-Pole Thermal-Magnetic MCCB is explicitly engineered to conquer this "High-Inertia" startup phase. By utilizing a fixed electromagnetic trip calibrated to 10 times the nominal current (10In = 4000A), it effortlessly ignores safe starting surges while maintaining a lethal, instantaneous response to genuine 50,000A (50kA) short circuits. Encased in a completely sealed, anti-corrosive polymer block, it thrives in harsh industrial zones where digital microprocessors fail.
Technical Parameters
| Device Category: | Thermal-Magnetic Molded Case Circuit Breaker (TM MCCB) |
| Poles Configuration: | 3P (Simultaneous 3-Phase Heavy Motor Isolation) |
| Frame Size & Rated Current (In): | 400A (Sustains massive continuous loads up to ~270kW) |
| Rated Operating Voltage (Ue): | AC 400V (50Hz) |
| Rated Insulation Voltage (Ui): | 800V |
| Rated Impulse Withstand Voltage (Uimp): | 8kV |
| Ultimate Breaking Capacity (Icu): | 50kA (L-Type severe fault suppression) |
| Service Breaking Capacity (Ics): | 35kA |
| Instantaneous Magnetic Trip (Ii): | 10In ± 20% (Crucial for heavy motor inrush immunity) |
| Standard Compliance: | GB/T 14048.2 / IEC 60947-2 |
1. Indestructible Thermal-Magnetic Defense
10In Motor Startup Immunity: The core of this breaker is its specialized magnetic coil. Tuned specifically to 4000 Amps (10In), it allows the massive rotors of heavy industrial pumps to spool up safely without nuisance tripping, guaranteeing smooth, uninterrupted facility operations.
50kA Catastrophic Arc Vaporization: When a true short circuit occurs, the immense magnetic field forcibly triggers the Category A instantaneous latch. The 50,000A plasma arc is violently drawn into dense metallic splitter grids, where it is fragmented, cooled, and neutralized in fractions of a millisecond, preventing devastating panel fires.
Inverse-Time Overload Protection: Deep inside the casing, heavy-duty bimetallic strips bend predictably based on the exact heat generated by the 400A current. This provides a safe, inverse-time delay for minor, temporary overworks, but permanently severs the circuit if a sustained, cable-melting overload occurs.
2. Ruggedized Environmental Architecture
Harsh Environment Resilience: Wastewater plants emit highly corrosive gases (like hydrogen sulfide) that destroy exposed circuit boards. Because this MCCB relies entirely on thick copper, silver-alloy contacts, and robust physical springs, it is virtually immune to chemical corrosion and extreme ambient humidity.
8kV Atmospheric Surge Firewall: Heavy industrial zones suffer from severe grid transients. The impressive 800V dielectric insulation and 8kV Uimp rating act as a heavy-duty firewall, preventing internal flashovers from grid switching spikes or nearby lightning strikes.
Color-Coded Visual Safety: Features a highly distinctive green operational toggle. In complex industrial motor control centers (MCC), this allows maintenance personnel to instantly visually identify the primary motor disconnect switch from standard black lighting or utility breakers.
3. Target Application Scenarios
Because of its foolproof thermal-magnetic design and crucial 10In motor-starting profile, this 400A MCCB is strictly specified by heavy-industry EPCs for:
Municipal Wastewater Treatment Plants: Serving as the ultra-reliable, moisture-proof main starter for massive 3-phase centrifugal pumps, aerators, and sewage lift stations.
Industrial Plastic Extrusion: Acting as the primary power gateway for huge injection molding machines, safely managing the intense loads of hydraulic pumps and multi-zone heating barrels.
Mining & Slurry Processing: Providing resilient, vibration-proof power isolation for heavy-duty rock crushers and slurry pumps in subterranean environments.
Heavy HVAC Chiller Plants: Supplying safe, high-inrush tolerant power to centralized 400A commercial air conditioning compressor units in large stadiums or airports.
4. Global B2B Partnership with CHNAILE Factory
Factory-Direct Industrial Procurement: Eliminate intermediary trading margins on essential heavy-duty components. Sourcing these massive 400A thermal-magnetic MCCBs directly from our automated lines drastically optimizes the BOM for your municipal and industrial construction projects.
Exhaustive IEC 60947-2 Calibration: Mechanical reliability is non-negotiable. Every 400A unit undergoes rigorous thermal-bath calibration to verify the exact inverse-time curve, alongside 50kA short-circuit blasts, ensuring flawless physical performance prior to global export.
OEM Integration for Switchboard Builders: We actively partner with global motor control center (MCC) manufacturers, providing customized laser-engraved faceplates, specifically tailored arc separators, and bespoke packaging to elevate your industrial switchgear brand.
