ETI EFI-P4 residual current device 4P 25A 0.1A type AC 10kA (2061621)

ETI EFI-P4 is a residual current device intended for protection of electrical circuits against leakage currents and for reducing the risk of electric shock. It is used in distribution boards of residential, commercial, and small industrial installations where automatic disconnection is required when a residual current appears. The device belongs to the differential relay category and is designed for installation on a TH 35 DIN rail, which makes it convenient to integrate into modular switchboards. The unit has 3+N pole arrangement, so it is suitable for three-phase networks with a neutral conductor. Its rated current is 25 A, while the rated residual current is 0.1 A, or 100 mA. This sensitivity is suitable for circuit protection where disconnection must occur in the presence of leakage currents without excessive response to minor transient currents. Type AC means the device responds to sinusoidal alternating residual current, which is relevant for standard AC loads. The rated AC voltage is 400/415 V, and the rated frequency is 50/60 Hz, so the device matches common supply network parameters. The short-circuit current rating Inc is 10 kA, which is an important indicator for operation in circuits with higher fault-current requirements. The device complies with IEC/EN 61008, the standard that defines requirements for residual current devices without built-in overcurrent protection. For installation planning, the body depth is 68 mm, allowing the required space to be taken into account inside the enclosure. The permitted conductor cross-section is 1 to 25 mm², so the device can be connected to a wide range of power and distribution conductors. The IP20 protection rating indicates indoor use inside an electrical enclosure, where contact protection is provided by the switchboard structure itself. Overall, this model is designed for residual current protection in three-phase low-voltage distribution systems where controlled disconnection and standardized DIN-rail mounting are required.