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Product Overview
While digital microprocessors have their place, the harsh, dust-filled environments of standard manufacturing floors demand the indestructible reliability of pure mechanical physics. The CHNAILE Heavy-Duty 3-Pole Thermal-Magnetic MCCB is engineered to provide unwavering, maintenance-free power protection. Utilizing a robust Category A architecture, this 125-Ampere breaker instantly neutralizes catastrophic short circuits up to 35,000A (35kA) via its powerful electromagnetic coil. Engineered with an extremely compact arc-flash clearance (≤50mm), it allows panel builders to design highly condensed, cost-effective distribution boards for commercial HVAC substations and bustling industrial assembly lines.
Technical Parameters
| Device Category: | Thermal-Magnetic Molded Case Circuit Breaker (TM MCCB) |
| Poles Configuration: | 3P (Simultaneous 3-Phase Solid Disconnect) |
| Frame Size (Inm): | 125A |
| Rated Current (In): | 125A (Continuous industrial payload) |
| Rated Operating Voltage (Ue): | AC 400V (50Hz) |
| Rated Insulation Voltage (Ui): | 800V |
| Ultimate Breaking Capacity (Icu): | 35kA (Robust fault suppression) |
| Service Breaking Capacity (Ics): | 25kA |
| Instantaneous Magnetic Trip (Ii): | 10In ± 20% (Optimized for motor inrush) |
| Arc Distance: | ≤ 50mm (Compact panel requirement) |
| Standard Compliance: | GB/T 14048.2 / IEC 60947-2 |
1. Precision Thermal-Magnetic Defense
Inverse-Time Overload Protection: The internal heavy-duty bimetallic strip bends predictably based on the exact temperature generated by the current. If a factory motor is slightly overworked, it allows a safe delay (Inverse-time characteristic) to prevent unnecessary shutdowns. However, if a dangerous, sustained overload threatens to melt the cable insulation, it permanently severs the circuit.
10In Magnetic Motor Startup Immunity: Heavy 3-phase motors in conveyor belts and HVAC chillers draw massive transient surges when starting. The fixed electromagnetic trip unit is expertly calibrated to 10 times the nominal current (10In = 1250A). This guarantees the breaker ignores brief, safe starting surges while remaining deadly responsive to genuine, instantaneous short-circuits.
Compact Arc Vaporization (≤ 50mm): Snuffing out a 35kA short circuit produces expanding plasma. This MCCB is designed with highly efficient internal de-ion arc chutes that restrict the external arc distance to under 50mm, enabling electrical contractors to install breakers closer together and shrink the overall dimensions of the control cabinet.
2. Ruggedized Industrial Structural Integrity
8kV Atmospheric Surge Resilience: Industrial parks are prone to severe power grid fluctuations. The impressive 800V dielectric insulation and 8kV Uimp rating act as a heavy-duty firewall, preventing internal flashovers from grid switching transients and nearby lightning strikes.
V0-Rated Anti-Tracking Casing: Molded from premium thermosetting plastics, the enclosure is immune to carbon tracking. It maintains absolute structural integrity even when absorbing the intense thermal shockwaves generated during repetitive AC-3 motor start/stop operations.
Mechanical Safety Verification: Features a prominent red 'Push to Trip' mechanical diagnostic button. This allows maintenance teams working in heavily vibrating factory floors to manually trigger and verify the health of the internal spring-latch mechanism before authorizing line-voltage operations.
3. Target Application Scenarios
Because of its foolproof thermal-magnetic design and ideal 10In motor-starting profile, this 125A MCCB is the industry-standard workhorse specified by EPCs for:
Automated Assembly Lines: Serving as the primary sub-distribution breaker powering robotic arms, long-run conveyor belts, and heavy packaging machinery.
Commercial HVAC Sub-Panels: Providing rugged, nuisance-free 3-phase protection for the massive compressors and blower motors of shopping mall air conditioning units.
General Factory Floor Distribution: Acting as the highly cost-effective, reliable branch protection in the Main Distribution Boards (MDB) of textile mills, food processing plants, and light metallurgical facilities.
Water Treatment Pump Controls: Supplying safe, high-inrush tolerant power to centrifugal municipal water pumps and aeration blowers.
4. Global B2B Partnership with CHNAILE Factory
Factory-Direct Industrial Procurement: Eliminate intermediary trading margins on essential panel-building components. Sourcing these high-volume thermal-magnetic MCCBs directly from our automated lines drastically optimizes the BOM for your factory construction projects.
Exhaustive IEC 60947-2 Calibration: Mechanical reliability is non-negotiable. Every unit undergoes rigorous thermal-bath calibration to verify the exact inverse-time curve, alongside 35kA short-circuit blasts, ensuring flawless performance prior to global export.
OEM Integration for Switchboard Builders: We actively partner with global control panel manufacturers, providing customized laser-engraved faceplates, specifically tailored phase barriers, and bespoke packaging to elevate your industrial switchgear brand.
