Eaton HMCP400X5W

The HMCP400X5W is a 3-pole magnetic molded case circuit breaker from Eaton's Series C line, specifically designed for overcurrent protection in motors and power distribution systems. It features a rated current of 400 A, a rated voltage of 600 VAC (also usable at 250 VDC), a short-circuit interrupting capacity of 35 kAIC (at 480 V), panel mounting design, and instantaneous trip functionality.

Key Technical Specifications

• Rated Current: 400 A
• Rated Voltage: 600 VAC / 250 VDC
• Poles/Phases: 3 P / 3 PH
• Interrupting Capacity: 35 kAIC @ 480 V
• Frame Type: KD (K Frame)
• Mounting Type: Panel Mount
• Protection Type: Magnetic, Instantaneous Trip Only (I-Instantaneous)
• Dimensions: Approximately 10.13 in (H) × 5.5 in (W) × 4.1 in (D)
• Termination: Feed-Thru Terminals, available with aluminum or copper options
• Certifications: UL, CSA, CE, and other international certifications

Product Features

• High Interrupting Capacity: 35 kAIC reliably clears high-current short circuits, enhancing system safety.
• Instantaneous Trip: Offers only I-Instantaneous protection, suitable for applications sensitive to motor starting currents.
• Modular Design: KD frame combined with feed-thru terminals enables quick on-site installation and replacement.
• Multi-Voltage Compatibility: Supports 600 VAC and 250 VDC to meet diverse system requirements.
• Compliance with International Standards: Certified by UL, CSA, CE, etc., for global market applicability.

Structure and Components

• Enclosure: High-strength molded case providing mechanical protection and insulation.
• Magnetic Trip Mechanism: Generates magnetic force instantly during overcurrent to drive the trip spring for fast tripping.
• K Frame: Standardized KD frame for easy integration with distribution cabinets and panels.
• Feed-Thru Terminals: Both power supply and load sides use feed-thru terminals to simplify wiring.
• Operating Handle: Manual reset/tripping operation with indicator lights for status display.

Typical Application Areas

• Motor Protection: Overcurrent and short-circuit protection for industrial motors, pumps, compressors, etc.
• Power Distribution Systems: Main/branch protection for factory distribution cabinets and building distribution boards.
• Energy Facilities: Front-end protection for substations, photovoltaic inverters, and wind turbine units.
• Process Control: Safety isolation for high-power loads in chemical, metallurgical, and other industries.

Installation and Maintenance Guidelines

• Installation Location: Adopt panel mounting, ensure the circuit breaker is placed horizontally, and maintain sufficient heat dissipation space.
• Wiring: Use feed-thru terminals to connect power lines and load lines to the corresponding L, N, U, V, W terminals, ensuring secure fastening.
• Reset Operation: After tripping, first check the cause of the fault. Manually reset only after confirming circuit safety. Frequent tripping requires inspection of motor starting current or system short-circuit conditions.
• Regular Inspection: Check terminal tightness, enclosure integrity, and operating handle flexibility every 6-12 months. Clean and fasten as necessary.
• Replacement and Upgrade: For replacement, directly pull out the old circuit breaker and insert the same-specification HMCP400X5W. For higher current or interrupting capacity, select larger-rated models in the same series.

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