Hager NDN325 Miniature Circuit Breaker 3P D 25A 10kA

The Hager NDN325 is a robust 3-pole miniature circuit breaker engineered to provide dependable protection for electrical installations. Designed for demanding environments, this device effectively monitors and safeguards circuits against overloads and short circuits, ensuring the integrity of your electrical infrastructure. With a rated current of 25A and a D-type tripping characteristic, it is specifically built to handle high inrush currents, making it a reliable choice for professional electrical systems operating at 400V AC.

Advantages

This circuit breaker offers exceptional durability and performance consistency, which are essential for maintaining safety in industrial and commercial settings. The D-type tripping curve allows the device to tolerate temporary high current surges without nuisance tripping, providing a stable power supply for equipment with high starting currents. Its 10kA breaking capacity ensures that the device can safely interrupt high fault currents, minimizing the risk of damage to connected equipment and wiring.

Suitable for

• Industrial machinery and motor control circuits
• Commercial electrical distribution boards
• Systems with high inrush current requirements
• Protection of 400V AC electrical installations

When it may not be suitable

This device is not intended for residential applications where B or C-type tripping characteristics are typically required for standard lighting and domestic appliance circuits. Using a D-type breaker in circuits without significant inrush currents may result in delayed protection during a fault.

Key specifications

• Number of poles: 3
• Rated current: 25A
• Tripping characteristic: D-type
• Breaking capacity: 10kA
• Rated operational voltage: 400V AC

How to use

The Hager NDN325 should be installed by a qualified electrician within a compatible distribution board or consumer unit. It is designed for DIN-rail mounting, allowing for quick and secure integration into standard electrical panels. Ensure that the supply voltage matches the device specifications and that all terminal connections are tightened to the manufacturer's recommended torque settings to prevent overheating.

What to consider before purchase

• Verify that the D-type tripping characteristic is appropriate for your specific load type.
• Ensure the 25A rating aligns with the circuit's total load and cable cross-section.
• Confirm that the installation environment meets the requirements for a 400V AC system.

Usage recommendations: Regularly inspect the circuit breaker for signs of wear or thermal damage. Test the device periodically to ensure the mechanical tripping mechanism remains functional and that the electrical connections remain secure.