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Product Overview
In massive municipal and industrial infrastructure, unexpected power loss due to a motor's starting surge can paralyze operations. The CHNAILE Intelligent 3-Pole 250A Electronic MCCB eliminates the inaccuracies of traditional thermal-magnetic devices. By integrating a highly responsive, microprocessor-driven solid-state trip unit, this breaker empowers electrical engineers to digitally calibrate the exact overload and short-circuit thresholds required by heavy inductive loads. With a formidable 35kA ultimate breaking capacity and true Category B selectivity, it ensures seamless power delivery and flawless fault isolation for the world's most demanding heavy motor control centers.
Technical Parameters
Device Category: | Electronic Molded Case Circuit Breaker (Solid-State MCCB) |
|---|---|
Poles Configuration: | 3P (Simultaneous 3-Phase Intelligent Control) |
Rated Current (In): | 250A (Engineered for heavy inductive motor loads) |
Rated Operating Voltage (Ue): | AC 220V up to AC 690V (Heavy industrial standard) |
Rated Insulation Voltage (Ui): | 750V |
Rated Impulse Withstand Voltage (Uimp): | 8kV |
Ultimate Breaking Capacity (Icu): | 35kA (at 400V) / 15kA (at 690V) |
Short-Time Withstand Current (Icw): | 10kA for 0.1s (Category B Selectivity) |
Control Core: | Advanced Solid-State Trip Unit (Adjustable Dials: Io, Ir, Isd) |
Standard Compliance: | GB/T 14048.2 / IEC 60947-2 |
1. Microprocessor-Driven Motor Defense
Inrush Current Immunity (Isd Calibration): Heavy centrifugal pumps and kilometers-long conveyor belts draw massive temporary currents upon startup. The dedicated 'Isd' (Short-time delay) dial allows technicians to delay the short-circuit trip just long enough to let the motor spool up safely, completely eradicating frustrating nuisance trips.
Category B Selective Coordination: A critical feature for complex distribution hierarchies. Thanks to its robust Icw rating (10kA/0.1s), this 250A main breaker can safely "hold" a 10,000-Ampere short-circuit fault for 100 milliseconds. This deliberate delay allows the smaller downstream breaker closest to the fault to clear it first, ensuring the rest of the facility remains fully powered.
Precision Thermal Overload (Io/Ir): The digital processing core continuously samples the AC waveform. It provides pinpoint accuracy for sustained overload protection, remaining entirely immune to the extreme ambient temperatures found in sweltering pump rooms or unventilated factory floors.
2. Heavy-Industry Structural Integrity
690V High-Voltage AC Resilience: While standard commercial breakers cap out at 415V, this MCCB is heavily insulated (Ui 750V) to operate continuously in AC 660V/690V heavy industrial grids, such as deep-shaft mining operations and maritime environments.
Dielectric Polymer Armor: The highly sensitive electronic processing board is shielded inside a ruggedized, anti-tracking V0 thermosetting enclosure. This protects the digital brain from severe factory vibrations and 8kV atmospheric voltage spikes.
Tamper-Proof Calibration Interface: The precise current setting dials are recessed and protected by a transparent, sealable polycarbonate shield. This vital feature ensures that unauthorized personnel cannot accidentally alter the life-saving motor protection curves.
3. Target Application Scenarios
Due to its sophisticated solid-state adjustability and Category B selectivity, this 250A Electronic MCCB is heavily mandated by global EPCs for:
Municipal Water Treatment Plants: Acting as the primary incoming protection for massive 3-phase centrifugal pumps, filtration motors, and sewage lift stations.
Automated Logistics Hubs: Serving as the intelligent main disconnect for sprawling, multi-kilometer automated sorting conveyor belts and heavy palletizers.
Heavy Mining & Extractive Industries: Managing the massive, fluctuating inductive loads of rock crushers, ball mills, and subterranean ventilation fans operating at 690V.
Industrial HVAC & Ventilation: Providing perfectly tuned, nuisance-trip-free protection for giant commercial exhaust fans and centralized industrial chillers.
4. Global B2B Partnership with CHNAILE Factory
Direct Factory Automation Supply: Sourcing microprocessor-controlled switchgear directly from our R&D and manufacturing facility gives your system integration firm a profound technological and pricing edge in high-end automation tenders.
Rigorous Solid-State Calibration: We do not rely on standard mechanical testing. Every electronic MCCB is subjected to exhaustive computerized secondary injection testing to verify the exact timing of the Ir and Isd delay curves prior to global export.
Premium OEM Panel Builder Support: We actively partner with elite automation panel builders worldwide, providing comprehensive technical support, customized dial calibrations, and bespoke branding for your proprietary motor control cabinets.
