Residual current device ETI EFI-4 4P 80A 0.03A type A 10kA (2062545)

ETI EFI-4 is a residual current device intended for monitoring leakage currents and disconnecting a circuit when a dangerous difference in current occurs. It is used in distribution boards of residential, commercial, and other electrical installations where protection of people and the electrical network against electric shock and insulation faults is required. The device belongs to the differential relay category and complies with IEC/EN 61008. This model is designed in a 4-pole 3+N configuration, which makes it suitable for three-phase networks with a neutral conductor. The rated current is 80 A, while the residual current sensitivity is 0.03 A, or 30 mA. This tripping level is commonly used for personal protection and for fast response to leakage conditions in group circuits. Type A means the device responds not only to sinusoidal alternating residual current, but also to pulsating direct residual current, which expands its use in circuits with electronic loads. The rated AC voltage is 415 V and the rated frequency is 50/60 Hz, so the device is compatible with standard alternating-current supply systems. The short-circuit current rating Inc is 10 kA, which is important for operation in networks where higher fault currents may occur. The permissible conductor cross-section is 1–25 mm², allowing connection of different wiring sizes used in distribution equipment. Installation is performed on a TH 35 DIN rail, and the housing depth is 68 mm, which should be considered during panel layout and device arrangement. The IP20 protection rating indicates indoor use inside enclosed electrical panels, where protection against accidental contact is provided under normal operating conditions. ETI EFI-4 is a practical solution for differential protection in electrical distribution systems where reliable leakage current detection and circuit disconnection are required.