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Product Overview
In temporary electrical installations like mega-construction sites or deep tunneling projects, maintaining continuous power is notoriously difficult. Heavy machinery, exposed wiring, and deep mud create capacitive leakages that instantly trip basic residual current devices. The CHNAILE Heavy-Duty 4-Pole Adjustable Earth Leakage MCCB is engineered specifically to conquer this environment. Acting as the ultimate main incomer for heavy-duty spider boxes and temporary distribution panels, it seamlessly manages 125A of 3-phase power. By integrating adjustable leakage thresholds and time delays into a massive 12kV surge-resistant casing, it allows EPC contractors to establish safe, multi-tiered ground fault protection without ever suffering from crippling, facility-wide nuisance trips.
Technical Parameters
Device Category: | Adjustable Earth Leakage Molded Case Circuit Breaker (Industrial RCBO) |
Poles Configuration: | 4P (Absolute 3-Phase & Neutral Isolation) |
Rated Current (In): | 125A (Sustains heavy temporary construction loads) |
Rated Operating Voltage (Ue): | AC 400V (50Hz) |
Rated Insulation Voltage (Ui): | 1000V |
Rated Impulse Withstand Voltage (Uimp): | 12kV (Extreme outdoor lightning defense) |
Ultimate Breaking Capacity (Icu): | 25kA (L-Type robust fault suppression) |
Adjustable Leakage Current (IΔn): | 100mA / 300mA / 500mA (Rotary dial selection) |
Adjustable Time Delay (Δt): | 0.1s / 0.4s / 1.0s (For cascading selectivity) |
Instantaneous Magnetic Trip (Ii): | 10In (Immune to crane & hoist motor inrush) |
Standard Compliance: | GB/T 14048.2 / IEC 60947-2 |
1. Mastery of Earth Fault Discrimination
Nuisance Tripping Prevention: The blue rotary dials on the front panel are the key to continuous operations. By adjusting the sensitivity to 300mA or 500mA, the main breaker ignores the harmless, natural capacitive leakage generated by hundreds of meters of heavy cables lying in damp trenches.
Cascading Safety Delays (Δt): Setting the time delay to 0.4s or 1.0s creates perfect "Earth Fault Discrimination." If a worker accidentally cuts a wire on the 3rd floor, the local 30mA/0.1s sub-breaker will trip instantly. The 125A main breaker detects the fault but "waits" for its programmed delay, allowing the local breaker to clear the danger while keeping the massive tower cranes and site lighting fully powered.
Total 4-Wire Galvanic Isolation: Temporary grids are inherently unstable. In the event of a critical short or massive leakage, the internally synchronized tripping bar severs L1, L2, L3, and the Neutral conductor simultaneously. This completely removes the risk of lethal neutral-return voltages electrifying muddy ground areas.
2. Ruggedized Construction-Grade Architecture
10In Motor Inrush Tolerance: Construction sites rely on massive inductive loads like tower cranes, concrete pumps, and heavy hoists. The fixed electromagnetic trip unit is calibrated to 10 times the nominal current (1250A), allowing these colossal motors to start up aggressively without falsely tripping the main breaker.
12kV Outdoor Lightning Shield: Temporary power panels 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 construction scaffolding cannot breach the breaker and destroy downstream tools.
Clear Diagnostic & Testing Interface: Features a dedicated yellow 'TEST' button for mandatory site safety audits, alongside a red 'Push to Trip' mechanical linkage checker. These tools empower site safety officers to verify mechanical integrity routinely in dust-choked environments.
3. Target Application Scenarios
Because of its customizable leakage coordination, 4-pole total isolation, and 125A capacity, this MCCB is strictly mandated by international construction codes for:
Construction Site Temporary Power: Serving as the foolproof main incoming switch for heavy-duty outdoor distribution boards (Spider Boxes) powering entire building sites.
Subterranean Tunnel Excavation: Providing highly regulated, nuisance-free earth fault protection for deep-shaft dewatering pumps and tunnel boring auxiliary grids.
Mobile Mining Infrastructure: Acting as the primary power gateway for portable skid-mounted substations in harsh, vibrating quarrying environments.
Outdoor Event & Festival Grids: Ensuring multi-tiered leakage safety and continuous power for massive temporary lighting and sound stage distribution networks.
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 temporary power and equipment leasing businesses.
Exhaustive IEC Calibration: Leakage selectivity requires absolute precision. Every unit undergoes rigorous computerized calibration to verify the exact 100/300/500mA and time-delay parameters, alongside 25kA short-circuit blasts prior to export.
OEM Customization for Panel Builders: We actively partner with global temporary power manufacturers, offering bespoke laser-engraved faceplates, heavy-duty phase barriers, and scalable manufacturing to elevate your proprietary distribution enclosures.
125AS Earth Leakage Molded Case Circuit Breaker — Instruction Manual
