Residual-current device (RCCB) E.NEXT PRO 4P 40A 30mA

The E.NEXT PRO 4P 40A 30mA residual-current device (RCCB) is designed to detect earth leakage and interrupt supply when an imbalance occurs between live conductors. This 4-pole RCCB provides a rated current of 40 A and a residual operating current of 30 mA, offering protection against electric shock and reducing the risk of fire caused by leakage currents. Intended for use in residential and light commercial distribution panels, the device integrates into standard DIN-rail systems and complements overcurrent protection devices in an electrical installation.

Advantages

The RCCB provides fast disconnection on detection of residual current, improving personal safety and equipment protection. As a 4-pole device, it protects all conductors in three-phase systems including neutral, ensuring balanced monitoring across phases. The nominal sensitivity of 30 mA is chosen to reduce the likelihood of dangerous electric shock while avoiding undesired trips from small leakage currents. Compact design allows space-efficient installation in consumer units and distribution boards.

Suitable for

• Residential electrical distribution panels and apartments
• Light commercial premises such as small offices and shops
• Three-phase circuits requiring neutral protection
• Complementing circuit breakers for personnel protection and leakage detection

Key specifications

• Poles: 4-pole configuration for three-phase plus neutral protection
• Rated current: 40 A
• Residual operating current (sensitivity): 30 mA
• Function: AC detection of earth leakage for disconnection
• Mounting: DIN-rail compatible housing for standard distribution boards
• Application: protection against electric shock and leakage currents in low-voltage installations

How to use

Install the RCCB in the distribution board on a DIN rail following applicable electrical codes and safety standards. Connect the incoming supply conductors to the line terminals and outgoing load conductors to the load terminals, ensuring correct phase and neutral alignment. Coordinate the RCCB with upstream and downstream overcurrent protection devices to maintain selectivity where required. After wiring, test the device using its test button or an appropriate external testing instrument to confirm correct operation before placing the circuit into regular service.

Usage recommendations

Regularly test the device by pressing the built-in test button at least every three months to verify trip function. Perform periodic inspection and functional testing as part of routine electrical maintenance and after any significant changes to the installation. Ensure compatibility with the system’s short-circuit and earth-fault characteristics and consult local regulations for required protection settings and coordination practices.