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Product Overview
In vast municipal installations, a localized ground fault on a single water pump or tarmac lighting rig must never cascade into a facility-wide blackout. The CHNAILE Heavy-Duty 4-Pole Adjustable Earth Leakage MCCB is the master conductor of electrical continuity. By merging the brute force of a 400-Ampere thermal-magnetic breaker with a highly sophisticated, customizable earth-fault detection module, it grants facility engineers perfect "Earth Fault Selectivity." Capable of instantly vaporizing 50,000A (50kA) short circuits while operating safely under an extreme 12kV atmospheric surge rating, this IEC-certified leviathan is the backbone of safe, uninterrupted public utility power distribution.
Technical Parameters
| Device Category: | Adjustable Earth Leakage Molded Case Circuit Breaker (Industrial RCBO) |
| Poles Configuration: | 4P (Type B Logic: N-pole breaks last, connects first for ultimate isolation) |
| Rated Current (In): | 400A (Engineered for massive 270kW+ continuous payloads) |
| 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): | 50kA (L-Type robust plasma suppression) |
| Adjustable Leakage Current (IΔn): | 100mA / 300mA / 500mA (Rotary dial tuning) |
| Adjustable Time Delay (Δt): | 0.1s / 0.4s / 1.0s (For cascading network safety) |
| Instantaneous Magnetic Trip (Ii): | 10In (Immune to massive motor startup inrush) |
| Standard Compliance: | GB/T 14048.2 / IEC 60947-2 |
1. Mastery of Cascading Fault Selectivity
Capacitive "Nuisance" Immunity: Large facilities utilize kilometers of underground cabling, naturally generating harmless background capacitive leakage. By adjusting the blue rotary dial to 500mA, this 400A main breaker intelligently ignores this background noise, keeping vital municipal infrastructure seamlessly online without false tripping.
Hierarchical Time Delays (Δt): Setting the time delay to 0.4s or 1.0s creates a hierarchical safety net. If a fault occurs on a downstream branch, this main 400A breaker detects it but "waits." This crucial window allows the local sub-breaker to trip first, isolating the danger while maintaining uninterrupted power to the rest of the airport terminal or water plant.
2. Heavy-Duty Municipal Architecture
Type B Neutral Isolation Dynamics: In complex 3-phase networks, neutral wire feedback poses a lethal electrocution hazard during maintenance. Designed with strict Type B internal logic, the Neutral pole connects before and breaks after the 3 live phases. This advanced mechanical synchronization prevents voltage spikes and ensures 100% true physical isolation from the utility grid.
10In Motor Inrush Tolerance: Water treatment facilities rely on colossal centrifugal pumps. The pure physical electromagnetic trip unit is calibrated to 10 times the nominal current (4000A). This allows massive industrial impellers to spool up aggressively without falsely triggering the main disconnect.
12kV Outdoor Lightning Shield: Main distribution boards are often situated near exposed environments. The staggering Ui 1000V internal insulation and 12kV Uimp rating act as an impenetrable dielectric firewall, ensuring direct lightning strikes on nearby towers cannot breach the breaker and destroy expensive downstream PLCs.
3. Target Application Scenarios
Because of its customizable leakage coordination, Type B 4-pole isolation, and massive 400A capacity, this MCCB is strictly mandated by international EPCs for:
Airport Ground Support Equipment (GSE): Serving as the reliable, nuisance-free main power gateway for extensive underground cable networks feeding aircraft power units on the tarmac.
Municipal Water Treatment Plants: Providing highly regulated, hierarchical earth fault protection for heavy-duty, deep-shaft dewatering pumps and aeration blowers in highly damp environments.
Large-Scale Public Venues: Acting as the primary power switch for mega-stadiums and exhibition centers where massive lighting arrays generate significant background leakage.
Heavy Port Infrastructure: Ensuring multi-tiered leakage safety and continuous power for sprawling dockside refrigerated container (Reefer) terminal boards.
4. Global B2B Partnership with CHNAILE Factory
Factory-Direct Municipal Sourcing: Bypass intermediary trading networks. Sourcing adjustable, high-capacity switchgear directly from our manufacturing lines drastically lowers the BOM for your large-scale government and utility infrastructure bids.
Exhaustive IEC Calibration: Leakage selectivity at 400 Amps requires absolute precision. Every unit undergoes rigorous computerized calibration to verify the exact 100/300/500mA and time-delay parameters, alongside 50kA short-circuit blasts prior to export.
OEM Customization for Panel Builders: We actively partner with global switchboard manufacturers, offering bespoke laser-engraved faceplates, heavy-duty arc barriers, and scalable manufacturing to elevate your proprietary distribution enclosures.
Residual Current Molded Case Circuit Breaker: Instruction Manual.pdf
