Hager ADM490C RCBO 4P 40A 30mA Type A 6kA

The Hager ADM490C is a high-performance 4-pole residual current circuit breaker with overcurrent protection (RCBO), engineered to provide comprehensive electrical safety in a single, compact unit. Designed for 230-400V AC electrical systems, this device integrates short-circuit protection, overload protection, and residual current detection to safeguard both personnel and equipment from electrical faults.

Advantages

This RCBO offers a space-saving solution by combining the functions of a miniature circuit breaker and a residual current device into one housing, which simplifies installation and reduces the amount of space required in distribution boards. The Type A protection ensures reliable detection of both AC and pulsating DC residual currents, making it highly effective for modern electrical installations that include electronic components. Its robust construction and 6kA breaking capacity provide consistent performance and durability in demanding residential and commercial environments.

Suitable for

• Residential electrical distribution boards
• Commercial building power systems
• Protection of circuits with electronic loads
• Installations requiring combined overload and leakage protection

When it may not be suitable

This device is not intended for use in DC-only electrical systems or high-voltage industrial grids exceeding the specified voltage range. It may also be unsuitable for circuits requiring a different sensitivity threshold or specific tripping characteristics not covered by the Type A standard.

Key specifications

• Number of poles: 4
• Rated current: 40A
• Residual current sensitivity: 30mA
• Protection type: Type A
• Breaking capacity: 6kA
• Operating voltage: 230-400V AC

How to use

The Hager ADM490C must be installed by a qualified electrician in accordance with local electrical regulations. It is designed for mounting onto a standard DIN rail within a distribution enclosure. Ensure that all supply and load cables are securely connected to the appropriate terminals, observing the correct torque settings to prevent loose connections. After installation, the device should be tested using the integrated test button to verify its mechanical operation and tripping functionality.

What to consider before purchase

• Verify that the 40A rated current matches your circuit load requirements.
• Ensure the 30mA sensitivity is appropriate for the intended level of personnel protection.
• Check that the 4-pole configuration is compatible with your specific wiring system.
• Confirm that the 6kA breaking capacity is sufficient for the prospective short-circuit current at the installation point.

Usage recommendations

Regularly test the device using the test button at least every six months to ensure the internal mechanism remains functional and provides continuous protection.