Hager ADA970D Residual Current Circuit Breaker with Overcurrent Protection 2P 20A C 30mA Type A

The Hager ADA970D is a high-performance 2-pole residual current circuit breaker with overcurrent protection (RCBO), engineered to provide comprehensive safety for 230V AC electrical systems. This device combines the functions of a miniature circuit breaker and a residual current device into a single compact unit, ensuring efficient protection against short circuits, electrical overloads, and dangerous leakage currents. Designed for reliability, it serves as a critical component in modern residential and commercial distribution boards.

Advantages

The primary benefit of the Hager ADA970D is its integrated design, which saves significant space in electrical enclosures by replacing two separate devices with one. Its Type A sensitivity ensures it can detect both alternating and pulsating direct residual currents, offering a higher level of safety compared to standard AC-type devices. The C-type tripping characteristic makes it ideal for circuits with moderate inrush currents, such as those powering lighting or small motor-driven appliances, preventing nuisance tripping while maintaining rapid response times during genuine faults.

Suitable for

• Residential electrical distribution boards
• Commercial office lighting circuits
• Protection of individual appliance circuits
• General-purpose power outlets

When it may not be suitable

This device is not intended for use in DC-only electrical systems or high-voltage industrial installations exceeding its rated voltage. It is also not suitable for circuits requiring B-type leakage protection, which is necessary for specific equipment like certain types of electric vehicle chargers or advanced frequency converters.

Key specifications

• Number of poles: 2P
• Rated current: 20A
• Tripping characteristic: C-type
• Residual current sensitivity: 30mA
• Device type: Type A
• Rated voltage: 230V AC

How to use

Installation must be performed by a qualified electrician in accordance with local electrical regulations. The device is designed for mounting onto a standard DIN rail within a 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. Once installed, the device should be tested using the integrated test button to verify the mechanical operation of the tripping mechanism.

What to consider before purchase

• Verify that the 20A rating matches the load requirements of your circuit.
• Ensure the 30mA sensitivity is appropriate for the intended level of human protection.
• Confirm that the installation space allows for a 2-pole RCBO configuration.
• Check that the Type A classification meets the safety requirements for your specific connected equipment.

Usage recommendations

Regularly test the device using the built-in test button at least every six months to ensure the internal mechanism remains functional and responsive to leakage currents.