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Product Overview
In the depths of a commercial vessel's engine room or a subterranean mining pump station, electrical protection cannot rely on fragile microchips. It requires brute mechanical resilience. The CHNAILE Rugged 3-Pole Thermal-Magnetic MCCB is engineered to survive where other breakers fail. By utilizing heavy-duty bimetallic strips and powerful fixed electromagnets, this breaker delivers uncompromising AC 400V/690V power management. It offers engineers the flexibility of an adjustable thermal overload threshold (70A to 100A) while maintaining an immovable 800A magnetic short-circuit response. Fully compliant with IEC 60947-2, it ensures 3-phase heavy machinery remains protected regardless of severe ambient temperatures, salt fog, or relentless mechanical resonance.
Technical Parameters
Device Category: | Thermal-Magnetic Molded Case Circuit Breaker (TM MCCB) |
|---|---|
Poles Configuration: | 3P (Simultaneous 3-Phase Heavy Disconnect) |
Trip Unit Technology: | TM 100 D (Physical Thermal-Magnetic Core) |
Adjustable Thermal Overload (Ir): | 70A to 100A (Rotary dial selection) |
Fixed Magnetic Short-Circuit (Im): | 800A (Instantaneous tripping threshold) |
Rated Operating Voltage (Ue): | AC 220V up to AC 690V |
Rated Insulation Voltage (Ui): | 750V |
Rated Impulse Withstand Voltage (Uimp): | 8kV |
Ultimate Breaking Capacity (Icu): | 35kA (at 380/415V) |
Short-Time Withstand Current (Icw): | 10kA for 0.1s (Category B Selectivity) |
Standard Compliance: | GB/T 14048.2 / IEC 60947-2 |
1. Indestructible Mechanical Protection
Adjustable Bimetallic Overload (Ir): The integrated rotary dial physically alters the tension on the heavy-duty bimetallic strip. This allows field technicians to precisely match the breaker's thermal response to the specific full-load amperage of aging industrial motors (between 70A and 100A), preventing wire degradation without nuisance tripping.
Instantaneous Magnetic Defense (Im 800A): When a catastrophic short circuit hits 800 Amps, the immense magnetic field forcibly triggers the mechanical latch. The 35,000A (35kA) plasma is instantly drawn into oversized arc chutes and vaporized, securing the main switchboard from explosive fires.
Category B Selective Coordination: Despite being a mechanical breaker, it boasts a robust 10kA/0.1s Icw rating. It can safely endure a 10,000-Ampere fault for 100 milliseconds, allowing a downstream miniature breaker to trip first and isolate the local fault, keeping the main shipboard grid active.
2. Extreme Environmental Architecture
Vibration-Resilient Chassis: Electronic breakers can suffer from cracked solder joints under heavy vibrations. This TM MCCB features a fully bolted, mechanically interlocked architecture that defies the relentless pounding of nearby marine diesel engines and heavy stamping presses.
Anti-Corrosive Insulating Armor: Housed in a premium V0-rated thermosetting polymer that repels moisture, resists salt-fog corrosion, and easily dissipates the heat generated by 100A continuous loads in non-ventilated industrial cabinets.
Mechanical Linkage Audit (Red 'Push to Trip'): Dust and maritime salt can seize mechanical parts. The highly visible red diagnostic button enables maintenance crews to safely force a mechanical trip, verifying the internal spring linkage is 100% responsive before authoring live 690V operations.
3. Target Application Scenarios
Due to its invincible thermal-magnetic architecture and 690V high-voltage capacity, this MCCB is strictly specified by heavy-industry EPCs for:
Marine & Offshore Switchboards: Serving as the resilient main incoming protection for commercial shipping vessels, offshore drilling platforms, and port-side crane rectifiers.
Industrial Pumping Stations: Providing adjustable, nuisance-free protection for massive 3-phase centrifugal water pumps and sewage treatment plant motors.
Mining & Heavy Crushers: Acting as the primary disconnect in subterranean mobile substations where dust, moisture, and vibration destroy sensitive electronics.
Legacy Panel Retrofits: The perfect drop-in replacement for aging industrial plants upgrading their motor control centers (MCC) without transitioning to complex digital systems.
4. Global B2B Partnership with CHNAILE Factory
Direct Heavy-Industry Procurement: Sourcing ruggedized thermal-magnetic switchgear directly from our manufacturing floor eliminates international trader markups, giving your engineering firm a massive financial edge in harsh-environment infrastructure bids.
Rigorous Mechanical Calibration: We rely on absolute physical accuracy. Every TM breaker is subjected to grueling thermal-bath calibration and 35kA short-circuit testing to verify the exact 70-100A and 800A tripping thresholds before export.
OEM for Marine & Industrial Builders: Leveraging our vast manufacturing footprint, we offer tailored OEM solutions—including customized laser-engraved faceplates and heavy-duty packaging—allowing elite panel builders to scale their proprietary switchboard brands globally.
