Residual current device P 304 4P 40 A 300 mA type AC, DX3 series 411723

Safety and Protection of Electrical Installations with the Legrand DX³ Residual Current Device

This four-pole residual current device from Legrand’s DX³ series is a critical component ensuring safety in every electrical installation. Designed to protect people and equipment against the effects of electric shock and to prevent fires, it provides a reliable barrier in case of short circuits and current leaks. The P 304 4P model, rated at 40A and with a sensitivity of 300mA (Type AC), is ideal for protecting circuits requiring high-level protection.

Functionality and Application

The P 304 4P residual current device is designed for DIN-rail mounting, simplifying installation and seamless integration into existing electrical infrastructure. Its compact dimensions (4 modules wide) allow efficient use of space in distribution boards. The device features high impulse current resistance (0.25 kA) and a short-circuit withstand rating of 10 kA, ensuring reliable operation even under demanding conditions. A mechanical lock prevents accidental re-energizing after the device has tripped due to protection activation.

Key Features and Benefits

• High Protection Efficiency: 300 mA sensitivity (Type AC) ensures effective protection against electric shock, especially in high-risk environments.
• Versatile Application: 40A rated current allows protection of a wide range of circuits—from lighting to high-power electrical equipment.
• Easy Installation: DIN-rail mounting simplifies and accelerates installation, minimizing system downtime.
• Durability and Reliability: Impulse current resistance and high short-circuit withstand capability guarantee long-term, fault-free operation.
• Enhanced Safety: Mechanical lock prevents accidental re-energizing after tripping, increasing safety during maintenance and repairs.
• Wide Operating Temperature Range: Operates reliably between -25°C and 60°C, enabling use in diverse environmental conditions.
• Compatibility with HX³ System: Integration with the HX³ Energy Distribution Optimization System up to 125 A allows wireless connection to the electrical network, enhancing system flexibility and functionality.
• Expandability: Compatibility with auxiliary devices (auxiliary contacts, signaling devices, trip units) enables customization of functionality to meet specific user requirements.

Technical Specifications for Professionals

The P 304 4P device features a rated voltage of 400V and an insulation voltage (Ui) of 500V. The rated impulse withstand voltage (Uimp) is 4 kV, ensuring resistance to transient overvoltages. The connected conductor cross-section ranges from 0.75 mm² to 50 mm² for single-core cables and from 0.75 mm² to 35 mm² for multi-core cables. The protection rating is IP20, providing protection against finger contact and ingress of solid objects larger than 12.5 mm. The device operates at 50 Hz with a pollution degree of 2. It is constructed from materials with a color close to RAL 7035.