Residual current circuit breaker P 312 2P B 25 A 30 mA Type A, DX3 series 410967

Protection and Safety in Your Electrical Installation

This two-pole residual current circuit breaker P 312 from the DX³ series by Legrand is a key component ensuring comprehensive protection in electrical circuits. It combines the functions of an overcurrent and residual current device, safeguarding against the effects of overloads, short circuits, and electric shock. As such, it provides reliable protection for both installers and end users.

This breaker is designed for operation in installations with a voltage of 230V and a rated current of 25A. The B characteristic ensures rapid response to increases in current, which is particularly important in circuits with high-inrush-load devices such as motors. The rated residual current of 30mA guarantees effective protection against electric shock. The Type A designation means the breaker responds to both sinusoidal and pulsating DC residual currents—extending the scope of protection.

Construction and Installation

The P 312 DX³ breaker occupies 2 module widths, enabling efficient use of space in the distribution board. It is mounted on a standard TH35 rail, and the option to connect via comb busbars or pin terminals ensures installation flexibility. Additionally, the breaker features a mechanical lock that prevents accidental re-energizing after tripping—enhancing safety during maintenance work. The test button allows for regular verification of the residual current device’s functionality.

Application and Compatibility

Breakers from the DX³ series are compatible with the Legrand HX³ Optimal Power Distribution System up to 125A, enabling wireless connection to the electrical installation. They are compatible with a wide range of Legrand accessories—including auxiliary and signaling contacts, undervoltage and overvoltage releases, and remote actuators—allowing customization of protection to meet specific installation requirements. The rated short-circuit breaking capacity of 6kA (compliant with EN 61009 and IEC 60947-2 standards) ensures effective protection against short-circuit consequences. The IP20 protection rating provides defense against finger contact and solid objects larger than 12.5 mm—suitable for most indoor applications.