OEM 3P Drawout Air Circuit Breaker 4000A 1140V for Marine Switchboards & FPSO Panels

A Strategic Manufacturing Alliance for Heavy Maritime and Industrial Switchgear Builders

In the elite echelon of global electrical manufacturing, constructing a Main Distribution Board (MDB) for a Floating Production Storage and Offloading (FPSO) vessel or a mega-scale desalination plant is the ultimate engineering crucible. At this massive scale—routing over 7.5 Megawatts of continuous power at extreme voltages up to AC 1140V—switchgear manufacturers and marine panel builders are not merely looking for a circuit breaker; they are seeking a highly engineered, deeply integrated supply chain solution that mitigates assembly risks, reduces structural cabinet volume, and guarantees uncompromising international marine regulatory compliance.

At CHNAILE, our operational philosophy is strictly B2B-focused: your success in the competitive heavy switchboard market is our success. We do not compete with our partners for end-user installation contracts. Instead, we serve as your dedicated manufacturing engine. The CHNAILE 3-Pole 4000A Ultra-High Voltage Drawout Air Circuit Breaker (ACB) is explicitly engineered for the workshop assembly floor. It addresses the exact mechanical and thermal pain points that assembly technicians and structural enclosure designers face daily: managing immense 1140V thermal outputs, accommodating staggering amounts of raw copper busbar weight within confined shipboard spaces, and ultimately passing the unforgiving IEC 61439 Type-Tested Assembly (TTA) verifications. By integrating our 4000A ACB into your proprietary electrical panels, you elevate your brand's capability to secure the most lucrative heavy-maritime and industrial infrastructure bids worldwide.

Technical Parameters

Overcoming Spatial and Thermal Bottlenecks in Panel Design

For a professional panel builder outfitting offshore platforms or cramped industrial electrical vaults, the physical footprint and thermal dissipation characteristics of a main breaker directly dictate the cost of the entire steel enclosure. Traditional open-air ACBs require massive overhead clearances to safely exhaust arc flashes, leading to bloated, oversized cabinets and wasted marine-grade sheet metal. We engineered the NLW3HU-4000 Series to systematically eliminate these spatial bottlenecks.

• Zero Arc Distance (0mm) for Ultra-Compact Enclosures:
  A defining, revolutionary feature of this 4000A titan is its internal plasma suppression matrix, which achieves an astonishing "Zero Arc Distance" (0mm). By aggressively cooling and exhausting the massive 100,000A (100kA) fault plasma entirely within the breaker's internal arc chutes, no dangerous ionized gas is expelled upwards. This allows your mechanical designers to drastically reduce the vertical dielectric clearance required above the breaker. You can design significantly shallower and shorter marine switchgear cabinets, slashing your specialized sheet metal fabrication costs and making your assembled panels much easier to transport and install in tight shipboard electrical rooms.

• Versatile Busbar Architecture for Streamlined Assembly:
  Routing 4000 Amps at 1140V requires an immense volume of heavy copper. Providing flexibility for your shop-floor technicians is paramount. As detailed in our engineering blueprints, the rear connections of the drawout cradle are meticulously designed to support both Horizontal and Vertical busbar wiring configurations. This exceptional versatility allows your panel design team to optimize the internal copper routing, minimizing acute busbar bends, reducing material waste, and vastly accelerating the factory-floor assembly timeline.

• Modular Drawout Cradle System:
  Lifting a 4000A circuit breaker into a steel enclosure is a major logistical challenge. This ACB features an ultra-robust, industrial-grade withdrawable chassis. During cabinet construction, your assembly workers only need to mount the empty cradle, allowing for unobstructed copper busbar alignment and drilling. The heavy breaker body is effortlessly racked into the cradle using the integrated mechanical drive only during the final Factory Acceptance Testing (FAT), preventing accidental damage during cabinet fabrication.

Unyielding 1140V Megawatt Control and Selectivity

A modern 4000A Main Distribution Board is the brain of a multi-million-dollar facility. The CHNAILE ACB empowers your custom switchgear with unparalleled digital oversight and highly programmable fault coordination at extreme voltages.

• 1140V AC Extreme Dielectric Firewall:
  To minimize transmission losses over long cable runs in marine or mining applications, engineers elevate the system voltage to AC 1140V. This ACB is fortified with a staggering 1500V insulation rating (Ui) and a 12kV impulse withstand rating (Uimp). This creates an impenetrable dielectric shield, ensuring your custom panels operate flawlessly without internal flashovers, even during severe power grid switching transients.

• Microprocessor-Based LSIG Protection (Category B):
  Preventing a facility-wide blackout relies on strict selective coordination. The integrated intelligent controller replaces rigid mechanical bimetals with surgical digital precision. Your engineering department can program highly specific LSIG (Long-time, Short-time, Instantaneous, and Ground-fault) protection curves. With an astonishing Icw (Short-time withstand current) rating of 100kA for 1.0 second, this breaker achieves perfect Category B selective coordination, ensuring that your massive main panel holds steady during a localized fault, allowing downstream breakers to trip first.

Elevating Your Switchboard Brand via Global OEM Dominance

Your completed electrical panels carry your reputation. Partnering with CHNAILE ensures that the core components inside reflect the premium nature of your manufacturing brand. We are committed to protecting your supply chain sovereignty.

• Private Labeling and Faceplate Branding:
  Elevate your corporate identity. We offer comprehensive OEM customization, including high-precision laser-engraving of your company logo directly onto the ACB faceplates. The digital interface, instructional safety labeling, and design language can be tailored to match your specific corporate guidelines. Your clients will receive a world-class product carrying your trusted brand name.

• Certified Quality to Fast-Track Your Panel Certifications:
  Winning major commercial and maritime bids requires your completed switchgear to pass strict classification society certifications (such as DNV, ABS, or CE). Our 4000A ACBs are rigorously tested in high-current laboratories to strictly comply with GB/T 14048.2 and IEC 60947-2 standards. We supply your engineering departments with all necessary technical documentation, dimensional CAD drawings, and test reports, significantly accelerating the certification process for your custom switchgear assemblies.

• Maximizing Your Bill of Materials (BOM) Profitability:
  Relying on intermediary trading companies for core components inflates costs and extends lead times. By sourcing these heavy-duty drawout ACBs directly from our automated manufacturing lines in China, you secure highly aggressive wholesale pricing. This direct-to-factory pipeline optimizes your Bill of Materials (BOM), significantly increases your profit margins on mega-scale infrastructure bids, and guarantees stable component supply so your assembly plant operates at peak efficiency.