Schneider C4044A400 MicroLogic Vigi 4.3 AL Trip Unit

The C4044A400 Schneider is a MicroLogic Vigi 4.3 AL electronic trip unit designed for advanced protection in low-voltage power distribution systems. Specifically engineered for integration with ComPacT NSX400 and NSX630 circuit breakers, this unit supports 4-pole configurations and is rated for 400 A at 40 °C.

It offers comprehensive protection functions, including long-time (L), short-time (S), and instantaneous (I) protection, with adjustable settings to suit various applications. The integrated earth leakage alarm provides early fault detection without tripping, enhancing system reliability. Additionally, the unit features LED indicators for overload and readiness status, enabling real-time monitoring of system conditions. Compliant with IEC 60947-2 standards, it ensures reliable performance in industrial and commercial environments.

Technical Specifications

• Model: C4044A400
• Type: Electronic Trip Unit with Earth Leakage Alarm
• Brand: Schneider Electric
• Range: ComPacT NSX New Generation

Power & Performance

• Rated Current: 400 A at 40°C
• Poles: 4P (Four Poles)
• Protected Poles: 3D + N/2, 4D, or 3D (configurable)
• Trip Unit Technology: Electronic
• Operational Voltage: 440V AC 50/60Hz
• Trip Unit Protections: L (Long-Time), So (Short-Time with fixed delay), I (Instantaneous)
• Application: Distribution

Protection Functions

• Long-Time Protection (Overload): Adjustable 160A – 400A (9 settings)
• Long-Time Delay: Fixed
  • 11s at 7.2 x Ir
  • 16s at 6 x Ir
  • 400s at 1.5 x Ir
• Thermal Memory: 20 minutes before and after tripping
• Short-Time Protection: Adjustable 1.5 to 10 x Ir
• Short-Time Delay: Fixed
• Instantaneous Protection: Fixed at 4800A
• Earth Leakage Alarm:
  • Provides alarm (no trip) via terminal block
  • Sensitivity Adjustment Range: 0.3A / 0.5A / 1A / 3A / 5A / 10A
  • Time Delay: Adjustable (0 ms / 60 ms / 150 ms / 500 ms / 1 s)
  • Earth Leakage Mode: OFF using IΔn rotary switch
• Neutral Protection Settings:
  • 0.5 x Ir (3D + N/2)
  • 1 x Ir (4D)
  • No protection (3D)
• Zone Selective Interlocking (ZSI): Not Available

Build & Design

• Mounting Mode: Fixed
• Local Signaling:
  • Flashing Green LED – Ready to operate
  • Red LED – Overload above 105% Ir
  • Orange LED – Overload above 90% Ir
  • Yellow Indicator – Residual current

C4044A400 Physical Specifications

• Gross Weight: 2.378 kg

Dimensions:

• Height: 17.0 cm
• Width: 21.0 cm
• Depth: 25.0 cm

Additional Features

• Operating Temperature: -25°C to 70°C
• Storage Temperature: -50°C to 85°C
• Standards Compliance: IEC 60947-2, Pollution Degree 3
• Electrical Shock Protection: Class II
• IP Rating: IP40 (IEC 60529)

Environmental Impact

• Carbon Footprint: 189 kg CO₂-eq (Total Life Cycle)
• Recycled Metal Content: 0%

Key Features & Benefits

✅ Earth Leakage Alarm: Built-in earth leakage detection sends an alarm without tripping, providing advanced fault monitoring and safety.

✅ Comprehensive Protection: Combines overload, short-circuit, and instantaneous protection with configurable neutral settings and clear local status indicators.

✅ Compact & Reliable: Ideal for use in standard and specific applications on ComPacT NSX400 and NSX630 systems.

✅ EcoStruxure Power Ready: Compatible with PowerTag NSX for enhanced energy management and system connectivity.

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