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The CHNAILE NLM1-250L-3P is a heavy-duty 250A Molded Case Circuit Breaker optimized for continuous 170kW loads in demanding industrial environments. It features a sophisticated thermal-magnetic trip unit calibrated to ignore safe inductive inrush currents while instantly responding to genuine short-circuit faults. Designed with an extremely compact form factor and efficient arc quenching system, it allows panel builders to create highly condensed, cost-effective distribution boards for modern, space-conscious mega-facilities. Every unit complies with GB/T 14048.2 and IEC 60947-2 international standards, ensuring consistent performance and safety across global installations.
10In Motor Startup Immunity: The fixed electromagnetic trip unit is expertly calibrated to trigger only at 10 times the nominal current (2500A ±20%). This guarantees the breaker ignores the heavy temporary current spikes generated by large 3-phase chillers and long-range logistics conveyors, completely eliminating nuisance tripping 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. It allows a safe, inverse-time delay for minor, temporary overloads to prevent unnecessary line shutdowns, while physically severing the circuit during sustained dangerous overloads to protect cabling and equipment from damage.
Compact Arc Vaporization Technology: Highly efficient internal de-ion arc chutes rapidly fragment and cool the high-pressure plasma generated during short-circuit events, restricting the external arc exhaust distance to ≤50mm. This crucial feature enables electrical contractors to install breakers closer together, significantly shrinking the footprint of control cabinets and reducing overall installation costs.
8kV Atmospheric Surge Resilience: Sprawling logistics parks are prone to severe power grid fluctuations and localized lightning strikes. The NLM1-250L-3P features 800V dielectric insulation and an 8kV rated impulse withstand voltage (Uimp), acting as a heavy-duty firewall against internal flashovers caused by grid switching transients and electrical surges.
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: A prominent red "Push to Trip" mechanical diagnostic button 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, ensuring maximum workplace safety.
Parameter | Value |
|---|---|
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 |
Thanks to its foolproof thermal-magnetic design, ideal 10In motor-starting profile and compact arc clearance, this MCCB 250A for Logistics Hubs is the industry-standard workhorse specified by EPCs worldwide 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
Factory-Direct Industrial Procurement: Eliminate intermediary trading margins on these essential high-volume panel components. Sourcing directly from our automated production lines drastically optimizes the BOM for your mega-warehouse construction projects.
Exhaustive Quality Testing: Mechanical reliability is paramount. Every 250A unit undergoes rigorous thermal-bath calibration to verify the exact inverse-time curve, alongside 35kA short-circuit blast tests, 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.
Global Technical Support: Our team of experienced electrical engineers is available to assist with product selection, system design and technical troubleshooting for projects of any size.
The instantaneous magnetic trip current is 10In ±20% (2500A ±20%), specifically calibrated to ignore motor startup surges while providing rapid short-circuit protection.
It fully complies with GB/T 14048.2 and IEC 60947-2 international standards for low-voltage switchgear and controlgear.
The external arc exhaust distance is ≤50mm, making it ideal for high-density panel installations where space is at a premium.
Yes, we provide comprehensive OEM services including customized faceplates, phase barriers and packaging to meet your specific requirements.
