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Product Overview
When feeding 170kW of 3-phase power from a commercial solar inverter array to the municipal grid, or driving massive slurry pumps deep underground, electrical protection must be both intensely powerful and surgically smart. The CHNAILE Heavy-Duty 4-Pole Adjustable Earth Leakage MCCB is engineered for these extreme high-demand environments. Combining the brute force of a 250A Thermal-Magnetic breaker with highly customizable ground-fault detection, it allows facility engineers to achieve perfect "Earth Fault Discrimination." Certified to GB/T 14048.2 and IEC standards, this industrial leviathan guarantees that minor downstream leaks never trigger a catastrophic, facility-wide blackout.
Technical Parameters
| Device Category: | Adjustable Earth Leakage Molded Case Circuit Breaker (Industrial RCBO) |
| Poles Configuration: | 4P (Type B Logic: Simultaneous 3-Phase + Neutral Disconnect) |
| Rated Current (In): | 250A (Sustains massive continuous commercial loads) |
| Rated Operating Voltage (Ue): | AC 400V (50Hz) |
| Rated Insulation Voltage (Ui): | 1000V (Exceptional dielectric strength) |
| Rated Impulse Withstand Voltage (Uimp): | 12kV (Utility-grade atmospheric surge defense) |
| Ultimate Breaking Capacity (Icu): | 35kA (L-Type robust fault suppression) |
| Adjustable Leakage Current (IΔn): | 100mA / 300mA / 500mA (Blue Rotary Dial) |
| Adjustable Time Delay (Δt): | 0.1s / 0.4s / 1.0s (Blue Rotary Dial) |
| Instantaneous Magnetic Trip (Ii): | 10In (2500A - Immune to heavy motor inrush) |
| Standard Compliance: | GB/T 14048.2 / IEC 60947-2 |
1. Mastery of Earth Fault Discrimination
Capacitive Leakage Immunity: Commercial solar plants utilize kilometers of AC cabling, which naturally generates harmless capacitive leakage currents. Standard fixed-RCDs interpret this as a fault and trip instantly. By adjusting the blue rotary dial to 300mA or 500mA, this MCCB intelligently ignores this inherent background "noise," keeping your renewable energy generation seamlessly online.
Cascading Safety Delays (Δt): Setting the time delay to 0.4s or 1.0s creates a hierarchical safety net. If a fault occurs at a secondary pump, the 250A main breaker detects it but "waits" for its programmed delay. This allows the local sub-breaker to trip first, clearing the danger while maintaining uninterrupted power to the rest of the industrial facility.
2. Ruggedized Industrial Structural Integrity
Type B Neutral Isolation Logic: In complex grid-tie solar systems, neutral wire feedback is a lethal hazard. Designed with strict Type B internal logic, the Neutral pole connects and breaks in absolute synchronization with the 3 live phases, without housing unnecessary thermal overload elements. This ensures 100% true physical isolation from the utility grid during maintenance.
10In Motor Inrush Tolerance: Mining operations rely on massive inductive loads. The fixed electromagnetic trip unit is calibrated to 10 times the nominal current (2500A). This allows colossal industrial pumps and blowers to start up aggressively without falsely tripping the main breaker.
12kV Outdoor Lightning Shield: Solar combiner boxes are fully exposed to the elements. The staggering Ui 1000V internal insulation and 12kV Uimp rating act as a heavy-duty dielectric firewall, ensuring that direct lightning strikes on solar panel arrays cannot breach the breaker and destroy expensive inverters.
3. Target Application Scenarios
Because of its customizable leakage coordination, Type B 4-pole isolation, and massive 250A capacity, this MCCB is strictly mandated by international EPCs for:
Commercial Solar AC Combiners: Serving as the foolproof main AC disconnect switch between high-capacity central inverters and the utility grid, immune to capacitive leakage.
Mining & Slurry Processing: Providing highly regulated, nuisance-free earth fault protection for heavy-duty, deep-shaft dewatering pumps in vibrating subterranean environments.
Large-Scale Agricultural Irrigation: Acting as the primary power gateway for multi-hectare sprinkler systems where extremely long cable runs generate high background leakage.
Heavy Port Infrastructure: Ensuring multi-tiered leakage safety and continuous power for massive dockside refrigerated container (Reefer) terminal boards.
4. Global B2B Partnership with CHNAILE Factory
Factory-Direct Infrastructure Sourcing: Bypass intermediary trading networks. Sourcing adjustable industrial switchgear directly from our manufacturing lines drastically lowers the BOM for your large-scale renewable and mining businesses.
Exhaustive IEC Calibration: Leakage selectivity requires absolute precision. Every 250A unit undergoes rigorous computerized calibration to verify the exact 100/300/500mA and time-delay parameters, alongside 35kA short-circuit blasts prior to export.
OEM Customization for Panel Builders: We actively partner with global commercial solar integrators, offering bespoke laser-engraved faceplates, heavy-duty phase barriers, and scalable manufacturing to elevate your proprietary distribution enclosures.
