Residual Current Circuit Breaker Hager ADX425D 4P 25A 30mA Type A, 10 kA

Hager ADX425D is a 4-pole residual current circuit breaker with overcurrent protection (FI-LS) that combines the functions of a residual current device (RCD) and a miniature circuit breaker (MCB). It has a rated current of 25 A, residual operating current of 30 mA (Type A) and a breaking capacity of 10 kA. The device is intended for three-phase electrical installations and provides combined protection against earth leakage, electric shock and short-circuit/overcurrent events in residential and light commercial environments.

Advantages

The unit integrates fault current detection and overload/short-circuit protection in a single compact device, reducing the space required in distribution boards and simplifying wiring. Type A residual current detection covers both AC and pulsating DC leakage currents, improving safety for circuits with electronic appliances. A 10 kA breaking capacity ensures reliable interruption of fault currents in typical low-voltage networks. The device's 4-pole configuration enables protection of all three phases plus neutral in three-phase systems.

Suitable for

• Protection of three-phase residential or small commercial electrical installations
• Circuits supplying motors, HVAC units and appliances with electronic controls
• Distribution boards where combined RCD + MCB protection is required to save space
• Applications needing 30 mA residual current sensitivity for personal protection

Key specifications

• Number of poles: 4
• Rated current: 25 A
• Residual operating current (sensitivity): 30 mA
• Type of residual current detection: Type A (AC and pulsating DC)
• Breaking capacity: 10 kA
• Function: combined residual current device and overcurrent protection
• Application: three-phase installations (phase + neutral protection)

How to use

Install the device in the distribution board on a compatible DIN rail following local electrical regulations and wiring diagrams. Connect the three phase conductors and neutral to the corresponding terminals, and ensure the line and load sides are correctly identified. After installation, test the residual current function using the built-in test button or a suitable testing instrument to verify correct operation. Replace the device if it fails any functional test or shows signs of damage.

Usage recommendations

Use this 4-pole FI-LS in circuits where both earth leakage protection and short-circuit/overload protection are required in a compact form. Ensure coordination with upstream and downstream protective devices and verify compatibility with connected electronic equipment to avoid unwanted tripping. Carry out periodic testing at intervals recommended by local regulations or standards.