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Product Overview
When operational downtime means spoiled inventory or flooded facilities, your electrical protection must be infallible. The CHNAILE High-Performance 3-Pole Miniature Circuit Breaker (MCB) is engineered to deliver unwavering power management for substantial 40-Ampere three-phase networks. Unlike standard breakers, this 3P unit provides simultaneous tripping across all active lines, eliminating the risk of catastrophic "single-phasing" that routinely destroys expensive 3-phase induction motors. Encased in a robust, standardized DIN-rail profile, it empowers MEP (Mechanical, Electrical, and Plumbing) contractors to build bulletproof distribution panels for high-inrush commercial infrastructure.
Technical Parameters
Device Category: | AC Miniature Circuit Breaker (MCB) |
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Poles Configuration: | 3P (Synchronized Three-Phase Protection) |
Rated Current (In): | 40A (Engineered for medium-heavy motor loads) |
Rated Operating Voltage (Ue): | AC 400V |
Rated Frequency: | 50Hz |
Short-Circuit Breaking Capacity (Icu): | 6000A (6kA) |
Trip Curve Type: | Curve C (Tolerates moderate inrush currents typical of motors) |
Installation: | 35mm Standard DIN-Rail Snap-on |
Standard Compliance: | GB/T 10963.1 (CCC Certified) |
1. Optimized 3-Phase Safeguards
Anti-Single-Phasing Mechanism: Features a mechanically interlocked trip bar. A fault on any individual phase guarantees the immediate disconnection of all three lines. This is a critical defense mechanism to prevent large 3-phase compressors and pumps from overheating due to phase loss.
High-Inrush Thermal Tolerance: The heavily calibrated 40A bi-metallic sensors are designed to withstand the temporary current spikes that occur during the startup of commercial refrigeration units, preventing frustrating nuisance trips.
Rapid Fault Decoupling (6kA): Houses superior electromagnetic trip coils that instantly recognize and extinguish massive short circuits up to 6000 Amps, securing the main panel from arc-induced fires.
2. Rugged Industrial Architecture
Enhanced Heat Dissipation Housing: Molded from premium, V0-rated thermosetting polymers. The enclosure is structurally optimized to safely dissipate the significant thermal energy generated by continuous 40A 3-phase power transmission.
Heavy-Gauge Copper Terminals: Outfitted with oversized internal copper conductors and high-torque fastening screws. This ensures maximum surface contact for thick-gauge industrial wiring, drastically reducing voltage drops and contact heating.
Vibration-Resistant DIN Lock: Utilizes a reinforced mounting clip that anchors securely to standard 35mm rails, easily absorbing the constant operational vibrations from nearby heavy machinery.
3. Target Application Scenarios
Because of its robust 40A capability and synchronized 3-pole design, this MCB is the top specification for:
Commercial Refrigeration & Cold Storage: Protecting the heavy-duty 3-phase compressors and condenser fans used in supermarkets and logistics warehouses.
Agricultural & Municipal Pumping Stations: Providing essential branch protection for large-scale water pumps, sewage treatment systems, and irrigation networks.
Industrial HVAC: Acting as the primary disconnect for commercial rooftop air conditioning units and industrial chiller plants.
Workshop Machinery: Securing the power supply for heavy 3-phase industrial lathes, CNC machines, and industrial conveyors.
4. Global B2B Partnership with CHNAILE Factory
Factory-Direct Procurement: Bypass intermediary markups. Sourcing directly from our production facility ensures you receive highly aggressive pricing, drastically improving your project bidding competitiveness.
Stringent Quality Verification: Every 40A 3P breaker undergoes rigorous automated thermal calibration and synchronization testing, ensuring it meets strict industrial safety standards prior to export.
Scalable OEM/ODM Solutions: Backed by massive manufacturing capabilities, we offer tailored branding, custom labeling, and bespoke packaging for electrical distributors worldwide.
