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Deliver uncompromising three-phase power protection with the CHNAILE NLL7-63 series 3-Pole Plug-in AC Miniature Circuit Breaker. Carefully engineered for heavy-duty alternating current distribution systems operating at 240/415V, this professional-grade circuit breaker is an essential safeguard against severe electrical faults that can cause costly equipment damage and dangerous fires. Encased in a premium, flame-retardant white housing, it integrates seamlessly into standard commercial distribution boards and modern residential load centers. The advanced plug-in mounting architecture empowers electrical contractors to perform instant module replacements, drastically minimizing labor costs and facility downtime during upgrades or repairs.
The NLL7-63 3P MCB provides precise detection and immediate disconnection to protect expensive three-phase machinery, HVAC systems, and wiring from irreversible thermal damage. Equipped with highly responsive bi-metal and electromagnetic trip units featuring Curve C characteristics, it is perfectly suited for general-purpose inductive loads commonly found in commercial and industrial environments. This dual protection system ensures reliable operation under normal conditions while reacting instantly to dangerous current fluctuations.
Featuring advanced internal arc-quenching chambers, this circuit breaker safely interrupts massive fault currents in milliseconds, effectively preventing panel fires and secondary damage to connected equipment. The impressive 10,000A (10kA) breaking capacity confidently handles severe AC fault currents, securing the safety of the entire downstream electrical grid and minimizing the risk of cascading failures that can disrupt entire facilities.
Constructed from high-grade V0 fire-resistant white materials, the NLL7-63 offers outstanding thermal stability and electrical insulation for rigorous commercial use. All internal contacts are forged from high-purity copper, minimizing electrical resistance, reducing temperature rise during operation, and ensuring highly efficient power transmission throughout the breaker's service life. This premium construction guarantees long-term reliability even in demanding operating conditions.
The modular plug-in base design eliminates tedious terminal rewiring that is required with traditional circuit breakers. Electrical contractors can safely swap aging or faulty units instantly without handling live wires, reducing installation time by up to 70% and significantly lowering the risk of electrical accidents during maintenance. Engineered with a rugged internal operating mechanism, the NLL7-63 guarantees tens of thousands of reliable mechanical and electrical cycles, providing years of trouble-free service. Additionally, it features clear mechanical status windows (Green for OFF/Safe, Red for ON/Live) to ensure maintenance personnel can visually verify circuit safety at a glance.
Parameter | Value |
|---|---|
Model | NLL7-63 3P AC |
Brand | CHNAILE |
Poles | 3P |
Rated Voltage | 240/415V AC |
Rated Current | 50A/63A |
Breaking Capacity | 10kA |
Trip Curve | C |
Standard Compliance | IEC60898-1 |
Mounting Type | Plug-in |
Housing Material | V0 Flame-Retardant Plastic |
Status Indication | Green (OFF/Safe), Red (ON/Live) |
 |  |
This professional-grade 3-phase AC MCB is the preferred choice for a wide range of applications:
Commercial office building power distribution boards (fast installation reduces renovation downtime)
3-phase residential consumer units (compact design fits modern load centers)
Industrial HVAC (Heating, Ventilation, and Air Conditioning) systems (C curve ideal for motor loads)
Heavy machinery and motor control panels (10kA breaking capacity handles high fault currents)
Retail and commercial lighting systems
Data center secondary distribution circuits
When you source the NLL7-63 3P plug-in MCB from CHNAILE, you benefit from our decades of expertise in manufacturing high-quality electrical protection products. As a direct manufacturer, we provide highly competitive factory-direct pricing to maximize profit margins for your distribution business. Every circuit breaker undergoes 100% rigorous automated calibration and testing prior to shipment, ensuring strict compliance with the IEC60898-1 international standard and consistent quality across every unit. We maintain extensive inventory levels to support rapid global fulfillment and offer comprehensive OEM/ODM customization services to help elevate your brand presence in local and international markets.
The CHNAILE NLL7-63 3P plug-in MCB has a breaking capacity of 10kA, which is suitable for most commercial and light industrial applications where high fault currents may occur.
Yes, all our NLL7-63 series MCBs are fully certified to IEC60898-1, ensuring compliance with global electrical safety requirements and making them suitable for installation in countries around the world.
The plug-in design eliminates the need for tedious terminal rewiring. Electricians can simply plug the MCB into the pre-wired distribution board, reducing installation time by up to 70% and minimizing facility downtime during upgrades or repairs.
The NLL7-63 3P plug-in MCB is available in both 50A and 63A rated current versions to meet different load requirements in commercial and industrial electrical systems.
Contact us today for a competitive quote on bulk orders or to learn more about our comprehensive OEM customization services for miniature circuit breakers.
