Residual current device P304 4P 40A 30mA type F (HPI) DX3 series 411695

Safety and Protection in Your Electrical Installation

This four-pole residual current device (RCD) from Legrand’s DX³ series is a critical component ensuring safety in every circuit. Designed to protect against electric shock and fire hazards, it responds to leakage currents and effectively disconnects power in the event of a fault. The P304 model, rated at 40A and with 30mA sensitivity (type HPi), is the ideal solution for both installers and end-users who value reliability and peace of mind.

Functionality and Applications

This device, designed for DIN-rail mounting, is suitable for a wide range of electrical installations—from residential to industrial. Its construction based on HPi (High Performance Immunity) technology provides immunity to electromagnetic interference, minimizing the risk of unwanted tripping, especially in environments with numerous electronic devices. This makes it an excellent choice for protecting circuits powering sensitive equipment such as power tools or audio-video systems. It supports cable cross-sections from 0.75 mm² to 50 mm² (single-core) and 0.75 mm² to 35 mm² (multi-core), ensuring compatibility with various wiring types.

Design and Key Features

The P304 RCD features compact dimensions—occupying only 4 modules on a DIN rail—facilitating installation even in cramped distribution boards. Its short-circuit withstand rating of 10 kA guarantees reliable operation during fault conditions. Additionally, the integrated lockout mechanism prevents accidental re-energizing after tripping due to residual current, enhancing safety during maintenance or repair work. The device also supports expansion with auxiliary accessories from the DX³ series, such as auxiliary contacts or undervoltage release units, allowing customization to meet specific installation requirements. Constructed from high-quality materials, it is resistant to environmental conditions within a temperature range of -25°C to 60°C and features an IP20 protection rating.