Residual current circuit breaker P312 2P B 20A 30mA TYPE AC DX3 410922

Protection of installations and people – Legrand P312 residual current circuit breaker

This two-pole residual current circuit breaker from the DX³ series by Legrand provides reliable protection of electrical installations against the effects of short circuits, overloads and electric shock. It combines the functions of two devices – an overcurrent circuit breaker and a residual current device – saving space in the distribution board. Designed for operation in circuits with a voltage of 230V and a current of 20A, with a residual current sensitivity of 30mA, it provides comprehensive protection for both the installation and users.

Functionality and installation

The P312 circuit breaker is characterized by a B characteristic, which means it reacts quickly to short circuits but is more tolerant to short-term overloads, e.g. when starting motors. This reduces the risk of unnecessary tripping of the circuit. Installation is on a standard TH35 rail, and the installation depth is 44 mm. The integrated test button allows regular checking of the correct operation of the residual current mechanism – crucial for ensuring continuous protection. The possibility of simultaneously disconnecting the N pole increases safety.

Technical parameters and application

The circuit breaker has a breaking capacity of up to 6 kA, which guarantees effective disconnection of the circuit in the event of a serious failure. Energy limitation class 3 provides additional safety in the event of an electric arc. The cross-section of the connected conductors can range from 0.75 mm² to 16 mm² (solid core) or 0.75 mm² to 10 mm² (stranded), providing great flexibility in cable selection. The device complies with IEC/EN 61009-1 standards and has a protection rating of IP20, which means protection against contact with fingers and solid objects larger than 12.5 mm. The locking mechanism prevents accidental adjustment of the circuit breaker. This circuit breaker is ideal for protecting lighting circuits, socket outlets and other current consumers in residential and commercial buildings.