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Product Overview
In round-the-clock facilities like e-commerce sorting centers and industrial cold storage, a false breaker trip caused by a massive motor starting up can halt kilometers of conveyor belts, costing thousands per minute. The CHNAILE Heavy-Duty 3-Pole Thermal-Magnetic MCCB relies on the unyielding reliability of pure physical engineering to prevent this. Calibrated for massive 250-Ampere continuous loads, it utilizes a sophisticated Cat A thermal-magnetic trip unit specifically tuned to ignore safe inductive inrush currents while instantly vaporizing genuine 35,000A (35kA) short-circuit faults. Engineered with an extremely compact arc-flash clearance (≤50mm), it allows panel builders to design highly condensed, cost-effective Distribution Boards for modern, space-conscious mega-facilities.
Technical Parameters
| Device Category: | Thermal-Magnetic Molded Case Circuit Breaker (TM MCCB) |
| Poles Configuration: | 3P (Simultaneous 3-Phase Solid Disconnect) |
| Frame Size & Rated Current (In): | 250A(Optimized for heavy conveyor & chiller motors) |
| Rated Operating Voltage (Ue): | AC 400V (50Hz) |
| Rated Insulation Voltage (Ui): | 800V |
| Rated Impulse Withstand Voltage (Uimp): | 8kV |
| Ultimate Breaking Capacity (Icu): | 35kA (L-Type robust fault suppression) |
| Service Breaking Capacity (Ics): | 25kA |
| Instantaneous Magnetic Trip (Ii): | 10In ± 20% (Motor inrush immunity threshold) |
| Arc Distance: | ≤ 50mm (High-density panel requirement) |
| Standard Compliance: | GB/T 14048.2 / IEC 60947-2 |
1. Precision Thermal-Magnetic Defense
10In Motor Startup Immunity: Activating a massive 170kW 3-phase chiller or a long-range logistics conveyor draws an immense temporary current spike. The fixed electromagnetic trip unit is expertly calibrated to trigger only at 10 times the nominal current (10In = 2500A). This guarantees the breaker ignores these safe, heavy motor starting surges while remaining deadly responsive to genuine short-circuits.
Inverse-Time Overload Protection: Equipped with heavy-duty internal bi-metallic strips that bend predictably based on exact thermal generation. If a facility motor is slightly overworked, it allows a safe, inverse-time delay to prevent unnecessary line shutdowns. If a sustained, dangerous overload occurs, it physically severs the circuit to protect the cabling from melting.
Compact Arc Vaporization (≤ 50mm): Snuffing out a 35kA short circuit produces highly pressurized plasma. This MCCB is designed with highly efficient internal de-ion arc chutes that rapidly fragment and cool the plasma, restricting the external arc exhaust distance to under 50mm. This crucial feature enables electrical contractors to install breakers closer together, significantly shrinking the footprint of the control cabinet.
2. Ruggedized Industrial Structural Integrity
8kV Atmospheric Surge Resilience: Sprawling logistics parks are prone to severe power grid fluctuations. The impressive 800V dielectric insulation and 8kV Uimp rating act as a heavy-duty firewall, preventing internal flashovers from grid switching transients and localized lightning strikes.
V0-Rated Anti-Tracking Casing: Molded from premium dark thermosetting plastics, the enclosure is immune to carbon tracking. It maintains absolute structural and dielectric integrity even when absorbing the intense thermal shockwaves generated during repetitive heavy-motor start/stop cycles.
Mechanical Safety Verification: Features a prominent red 'Push to Trip' mechanical diagnostic button. This allows maintenance teams working in heavily vibrating factory environments to manually trigger and verify the health of the internal spring-latch mechanism before authorizing live operations.
3. Target Application Scenarios
Because of its foolproof thermal-magnetic design, ideal 10In motor-starting profile, and compact arc clearance, this 250A MCCB is the industry-standard workhorse specified by EPCs for:
Automated Logistics & Sorting Hubs: Serving as the primary sub-distribution breaker powering massive automated sorting matrices and multi-kilometer conveyor belt systems.
Commercial Cold Storage Facilities: Providing rugged, nuisance-trip-free 3-phase protection for the massive compressors and condenser fans used in industrial deep-freeze warehouses.
Heavy HVAC & Chiller Sub-Panels: Supplying safe, high-inrush tolerant power to central air conditioning plants in commercial shopping malls and office high-rises.
General Factory Floor Distribution: Acting as the highly cost-effective, reliable branch protection in the Main Distribution Boards (MDB) of textile mills and light metallurgical plants.
4. Global B2B Partnership with CHNAILE Factory
Factory-Direct Industrial Procurement: Eliminate intermediary trading margins on these essential, high-volume panel components. Sourcing these thermal-magnetic MCCBs directly from our automated lines drastically optimizes the BOM for your mega-warehouse construction projects.
Exhaustive IEC 60947-2 Calibration: Mechanical reliability is paramount. Every 250A unit undergoes rigorous thermal-bath calibration to verify the exact inverse-time curve, alongside 35kA short-circuit blasts, ensuring flawless performance prior to global export.
OEM Integration for Switchboard Builders: We actively partner with global control panel manufacturers, providing customized laser-engraved faceplates, specifically tailored phase barriers, and bespoke packaging to elevate your industrial switchgear brand.
