Residual current device P 304 4P 40 A 30 mA Type A DX3 series 411760

Safety and Reliability in Your Electrical Installation

This four-pole residual current device (RCD) from Legrand’s DX3 series is a critical component ensuring protection of people and equipment in electrical installations. Designed to safeguard circuits with a rated current of 40 A, it responds to leakage currents of 30 mA, effectively preventing electric shock. Classified as Type A, it is ideal for use with devices generating alternating currents at 50 Hz.

The P 304 DX³ is not only about safety—it also offers user convenience. It features a mechanical lock that prevents accidental tripping, and a test button enables regular functional checks. DIN rail mounting is quick and simple, appreciated by both professional electricians and DIY enthusiasts. With a width of 4 modules, it allows efficient use of space in the distribution board.

Design and Technical Specifications for Professionals

The device exhibits high resistance to environmental conditions, operating reliably in temperatures ranging from -25°C to 60°C. Its rated insulation voltage (Ui) is 500 V, and its short-circuit withstand capacity (Icw) reaches up to 10 kA, ensuring dependable performance even under overload or short-circuit conditions. The rated impulse withstand voltage (Uimp) is 4 kV. The device complies with safety standards and features an IP20 protection rating, safeguarding against finger contact and ingress of solid objects larger than 12.5 mm. Additional accessories can be added to tailor the device to specific installation requirements. The connected conductor cross-section for single-core cables ranges from 0.75 to 50 mm², and for multi-core cables from 0.75 to 35 mm².

Functionality and Applications

RCDs from the DX³ series are compatible with Legrand’s HX³ Optimal Energy Distribution System, enabling wireless connection to electrical installations. They support various auxiliary devices such as auxiliary contacts, signaling contacts, and under-voltage and over-voltage trip units. A wide range of rated currents (16 to 100 A) and rated residual currents (10 to 500 mA) allows precise selection for specific application needs. Special variants—Hpi, S, and B—extend the application possibilities across diverse electrical installation types.