Hager ADA975D Residual Current Circuit Breaker with Overcurrent Protection 2P 25A 30mA Type A

The Hager ADA975D is a professional-grade residual current circuit breaker with overcurrent protection (RCBO), engineered to provide comprehensive safety for electrical circuits. This 2-pole device combines the functions of a miniature circuit breaker and a residual current device in a single compact unit, effectively monitoring for both overcurrent conditions and leakage currents. It is designed to maintain high operational standards in modern electrical distribution systems, offering reliable protection for both residential and commercial environments.

Advantages

This RCBO offers a high level of integration by combining two critical safety functions into one space-saving module, which simplifies installation within distribution boards. The Type A classification ensures that the device is capable of detecting both alternating residual currents and pulsating direct residual currents, providing a broader range of protection compared to standard AC types. Its robust construction and precise tripping characteristics contribute to the long-term stability and safety of the electrical installation, minimizing the risk of fire and electric shock.

Suitable for

• Residential electrical distribution boards
• Commercial office power systems
• Protection of final circuits against overloads and short circuits
• Detection of earth leakage currents in single-phase installations

When it may not be suitable

This device is not intended for use in three-phase electrical systems, as it is designed specifically for 2-pole single-phase applications. It should not be installed in environments where the electrical load consistently exceeds the 25A rated current, as this will lead to nuisance tripping.

Key specifications

• Number of poles: 2P
• Rated current: 25A
• Residual current sensitivity: 30mA
• Type: A
• Function: Overcurrent and leakage protection

How to use

The device must be installed by a qualified electrician in accordance with local electrical regulations. It is mounted onto a standard DIN rail within a consumer unit or distribution board. Ensure that the supply cables are securely connected to the input terminals and the load cables to the output terminals, observing the correct polarity and torque settings specified by the manufacturer. After installation, the functionality should be verified using the integrated test button to ensure the tripping mechanism operates correctly.

What to consider before purchase

• Verify that the 25A rating matches the requirements of your specific circuit load.
• Ensure the 30mA sensitivity is appropriate for the intended application, such as personal protection.
• Confirm that the installation space allows for a 2-pole modular device.
• Check that the Type A classification meets the requirements of the connected equipment, especially for electronics with power supplies.

Usage recommendations: It is recommended to perform a manual test using the test button at least every six months to ensure the mechanical integrity of the tripping mechanism. Do not use this device as a primary switch for frequent manual operation.