Hager MC340A Circuit Breaker 3-Pole 40A C-Curve 6kA

The Hager MC340A is a professional-grade 3-pole miniature circuit breaker engineered to provide robust protection for electrical circuits. Designed for integration into both residential and industrial distribution boards, this device effectively monitors current flow to prevent damage from overloads and short circuits. Its 40A rated current and C-curve tripping characteristic make it a reliable component for managing three-phase electrical systems, ensuring consistent performance and safety in demanding environments.

Advantages

This circuit breaker offers high operational reliability and durability, meeting stringent safety standards for electrical installations. The C-curve characteristic provides a balanced response to current surges, making it suitable for a wide range of applications including inductive loads. Its compact design allows for efficient space utilization within standard distribution panels, while the 6kA breaking capacity ensures that the device can safely interrupt fault currents, protecting downstream equipment and wiring from potential electrical hazards.

Suitable for

• Three-phase residential electrical distribution boards
• Industrial machinery and equipment power supply
• Commercial building electrical infrastructure
• Protection of circuits with moderate inrush currents

When it may not be suitable

This circuit breaker is not intended for use in circuits requiring a different tripping characteristic, such as B-curve for purely resistive loads or D-curve for high-inrush equipment like large motors. It is also not suitable for single-phase applications where a 1-pole or 2-pole breaker would be more appropriate.

Key specifications

• Number of poles: 3
• Rated current: 40A
• Tripping characteristic: C-curve
• Breaking capacity: 6kA
• Mounting type: DIN rail

How to use

The Hager MC340A is designed for installation on a standard DIN rail within an electrical distribution enclosure. Installation should be performed by a qualified electrician in accordance with local electrical codes and safety regulations. The device is connected by securing the supply wires to the input terminals and the load wires to the output terminals, ensuring all connections are tightened to the manufacturer's specified torque to prevent overheating.

What to consider before purchase

• Verify that the 40A rating matches the requirements of your circuit load.
• Ensure the 6kA breaking capacity is sufficient for the prospective fault current at the installation point.
• Confirm that the 3-pole configuration is compatible with your three-phase system layout.
• Check available space on the DIN rail within your distribution board.

Usage recommendations

Regularly inspect the circuit breaker for signs of thermal damage or loose connections. It is recommended to perform periodic testing of the installation to ensure the device remains functional and continues to provide the necessary protection for your electrical system.