Residual current device PR 304 4P 125 A 30 mA Type F (HPI) DX3 series 410637

Residual Current Device – Protection and Installation Safety

The PR 304 residual current device from the DX3 series is a reliable unit providing effective protection for people and electrical installations against electric shock, short circuits, and overloads. Designed for circuits with a rated current of 125A, it offers a high level of safety thanks to its 30mA residual current sensitivity (Class F). This is particularly critical in residential areas, offices, and other locations where protection against accidental contact with live conductors is required.

This four-pole (4P) residual current breaker performs excellently in both three-phase and single-phase installations with a neutral conductor. Its locking mechanism prevents accidental activation or deactivation, further enhancing operational safety. The use of Class F characteristics ensures rapid response to leakage currents, minimizing the risk of electric shock.

Design Features and Applications

The PR 304 is compatible with Legrand DX3 thermal-magnetic circuit breakers, forming an integrated protection system. Installation is performed on a DIN rail, simplifying and accelerating setup. The device exhibits high resistance to environmental conditions and operates reliably in temperatures ranging from -25°C to 70°C, making it suitable for diverse indoor and outdoor applications. It supports conductor cross-sections of 1.5 mm² to 70 mm² for single-core cables and 1.5 mm² to 50 mm² for multi-core cables.

The device operates at a rated current of 125A and a rated voltage range of 250–440V (250-440V). Its residual current sensitivity is 30mA (Class F), with an IP20 protection rating. It is designed for operation in temperatures from -25°C to 70°C. Additional protection against unintended tripping minimizes false alarms and unnecessary system downtime. The rated impulse voltage withstand of 6kV ensures resilience against voltage surges, enhancing device durability and reliability. The pollution degree 3 rating indicates suitability for use in environments with moderate industrial contamination. The device complies with current safety standards, ensuring full conformity with legal and technical requirements.