Residual current device (RCD) P 304 4P 63 A 300 mA type A-S DX3 series 411801

Electric shock and fire protection for electrical installations

The P 304 residual current circuit breaker from the DX³ series is a key element of the electrical installation protection system, providing comprehensive protection for users against indirect contact and effectively protecting against fire hazards resulting from permanent earth fault current. The device detects earth leakage currents starting from 300 mA, which guarantees a rapid response to dangerous situations.

Model P 304 4P is a four-pole solution adapted for operation in three-phase installations with a rated voltage of 400 V. Equipped with a test circuit button, it enables regular checking of the device's operational correctness - a simple service procedure that allows for ongoing monitoring of the protection status.

Technical parameters and device construction

The circuit breaker operates at a rated current of 63 A and an insulation voltage of 500 V, providing a high short-circuit strength of 10 kA. The design is adapted for mounting on a standard DIN rail with a width of 4 modules (71.2 mm), facilitating installation in distribution boards.

The device is characterized by a wide operating temperature range from -25°C to 60°C, making it suitable for both heated rooms and industrial conditions. The IP20 protection rating protects against finger contact and access with a wire.

The cross-sections of the connected conductors range from 0.75 mm² to 50 mm² for single-core conductors and up to 35 mm² for multi-core conductors. The screw terminal ensures a secure connection with both cables and busbars.

System functionality and expansion possibilities

The DX³ series works with the HX³ Optimal Power Distribution System up to 125 A, enabling wireless connection of devices to the electrical installation. This solution opens up possibilities for building intelligent electrical installation systems.

The device can be additionally equipped with a wide range of accessories: auxiliary and signaling contacts, undervoltage and overvoltage tripping releases, and remote actuators. This allows the functionality of the circuit breaker to be tailored to the specific needs of the installation.

Selective protection and short-time delay tripping allow for precise control of the sequence of protection device operation in multi-stage installations. A mechanical lock prevents accidental switching during service work.

Normative compliance and operating conditions

The circuit breaker meets the requirements of the IEC/EN 61008-1 standards for devices with a rated short-circuit capacity of 10000 A. Type A-S ensures the detection of both sinusoidal and pulsating residual currents - a universal solution for most typical domestic and industrial loads.

An operating frequency of 50 Hz, an impulse withstand voltage of 4 kV, and current impulse resistance of 3 kA guarantee stable operation even in difficult power grid conditions. The environmental pollution degree is 2 - a standard for most indoor applications.

The device holds VDE and CB-CB certificates confirming international compliance. The storage temperature ranges from -40°C to +70°C, and the RAL 7035 color ensures an aesthetic appearance in the distribution board.