Residual current device PR 304 4P 125 A with adjustable trip range 300-1000 mA, Type F (HPI), DX3 series 410644

Advanced protection with Legrand DX³ residual current device

The DX³ series PR 304 4P 125A residual current device with adjustable sensitivity 300–1000 mA, Type F (HPI), is a critical component ensuring safety in electrical installations. This device effectively protects against electric shock and prevents fires caused by earth faults. It is an indispensable solution for both residential and industrial applications where high reliability and protection are required.

This four-pole residual current breaker, rated at 125 A, is designed for use with three-phase circuits. Its construction based on Type F technology (formerly HPI) ensures detection of both AC fault currents and pulsating DC currents—particularly important in modern installations powering electronic devices that may generate such disturbances. The adjustable sensitivity range of 300–1000 mA allows fine-tuning of the device’s response to the specific requirements of the installation, minimizing the risk of unwanted tripping.

Robust construction and easy installation

The PR 304 residual current device features high-quality construction and durability. The housing, made from robust plastic, provides resistance to mechanical damage, while the IP20 protection rating ensures safe operation under normal environmental conditions. The device is designed for DIN-rail mounting and occupies 6 modules in the distribution board. Additionally, it includes a lockout mechanism preventing accidental disconnection, enhancing operational safety. Conductors with cross-sections from 1.5 mm² to 70 mm² (single-core) or 1.5 mm² to 50 mm² (multi-core) can be connected via screw terminals.

• Wide rated voltage range: 250–440 V – ensures compatibility with various power systems.
• Adjustable residual current: 300–1000 mA – enables precise sensitivity adjustment to meet installation requirements.
• Protection against unintended tripping: Reduces the risk of false alarms and operational downtime.
• Operating temperature: -25°C to 70°C – enables use in demanding environmental conditions.
• Rated impulse withstand voltage: 6 kV – ensures resistance to voltage surges.

Thanks to this residual current device, installers can be confident that the protection system meets the highest safety standards, while end users are safeguarded against potential hazards related to electric shock and fire. Complies with IEC/EN 61009-1, 60947-2 (adjustable), and 62423 (Type F) standards.