Hager ADC975D Residual Current Circuit Breaker with Overcurrent Protection 2P 25A C 30mA Type AC

The Hager ADC975D is a high-performance residual current circuit breaker with overcurrent protection (RCBO), engineered to provide comprehensive safety for electrical installations. This 2-pole device combines the functions of a miniature circuit breaker and a residual current device in a single compact unit, effectively monitoring electrical circuits for both overcurrent conditions and earth leakage faults. It is designed to operate at a rated current of 25A with a C-type tripping characteristic, ensuring reliable performance in standard residential and commercial environments.

Advantages

This RCBO offers a significant space-saving advantage by integrating two critical protection functions into one modular component, which simplifies installation within distribution boards. The device provides robust protection against short circuits and overloads, while the 30mA sensitivity threshold for AC type leakage currents ensures rapid disconnection in the event of a ground fault, thereby enhancing user safety and preventing potential fire hazards. Its high-quality construction reflects the reliability expected from Hager electrical components, ensuring long-term operational stability.

Suitable for

• Residential electrical distribution boards
• Commercial office lighting and power circuits
• Protection of individual final circuits
• General purpose electrical installations requiring earth leakage and overcurrent protection

When it may not be suitable

This device is specifically designed for AC type leakage currents and may not be suitable for circuits containing electronic equipment that produces DC components, such as certain types of variable speed drives or advanced power electronics. In such cases, a Type A or Type B residual current device might be required to ensure proper detection.

Key specifications

• Number of poles: 2P
• Rated current: 25A
• Tripping characteristic: C-type
• Residual current sensitivity: 30mA
• Leakage current type: AC
• Rated voltage: 240V

How to use

The Hager ADC975D is intended for installation by a qualified electrician within a standard DIN-rail distribution board. The device should be mounted securely onto the rail, and the supply and load conductors must be connected to the appropriate terminals according to the wiring diagram provided on the device housing. Ensure that all connections are tightened to the manufacturer's specified torque to prevent overheating. Once installed, the device can be activated by moving the toggle switch to the ON position.

What to consider before purchase

• Verify that the 25A rated current matches the requirements of the circuit being protected.
• Ensure the C-type tripping curve is appropriate for the connected load, particularly for equipment with high inrush currents.
• Confirm that the electrical system requires AC type protection rather than Type A or B.
• Check the available space in your distribution board for a 2-pole modular device.

Usage recommendations

Regularly test the functionality of the RCBO by pressing the integrated test button at least every six months to ensure the mechanical tripping mechanism remains operational.