ETI EFI-P4 residual current device 4P 25/0.3A type AC 10kA (2061631)

ETI EFI-P4 is a residual current device intended for protection of electrical circuits against leakage currents and for disconnecting the line when a dangerous differential current appears. It is used in residential, commercial, and other electrical installations where continuous monitoring of insulation faults and personnel protection are required. The device belongs to the residual current relay category and complies with IEC/EN 61008. This model is rated for 25 A and has a residual current setting of 0.3 A. Such parameters make it suitable for distribution circuits where leakage current control is needed without changing the basic load current characteristics. The AC type means the device is designed for circuits with sinusoidal alternating residual current. The 3+N construction provides three active poles plus neutral, which is appropriate for three-phase networks with neutral conductor. The rated voltage is 400/415 V AC, and the rated frequency is 50/60 Hz, so the device can be used in networks with the common supply standards. The short-circuit rated current Inc is 10 kA, which defines the device’s ability to withstand fault conditions within specified limits. The permissible conductor cross-section is 1–25 mm², allowing connection of different circuit conductors within the declared range. Mounting is performed on TH 35 DIN rail, which ensures compatibility with standard modular distribution boards. The housing depth is 68 mm, an important value for planning internal space in a panel. The degree of protection IP20 indicates installation inside a cabinet or enclosure, where direct contact with live parts is prevented under normal operating conditions. As a modular protective device, EFI-P4 is used in switchboards where leakage-current protection must be combined with compact rail-mounted installation. Its technical data make it suitable for group protection in three-phase systems with neutral, especially where standard AC residual current detection and a 10 kA short-circuit withstand level are required.