Residual current device ETI EFI-4 100/0,1 type AC 10kA (2062153)

The ETI EFI-4 residual current device is intended for monitoring leakage currents in electrical networks and disconnecting the circuit when a dangerous residual current appears. It is used in distribution boards of residential, commercial, and small industrial installations where additional protection of supply lines and increased electrical safety are required. The device belongs to the differential relay category and is manufactured in accordance with IEC/EN 61008. This model is rated for 100 A nominal current and a residual operating current of 0.1 A, which makes it suitable for circuits with relatively high load where leakage control is necessary without excessively sensitive tripping. Type AC means the device responds to sinusoidal alternating residual currents. The 3+N pole configuration allows connection in three-phase systems with a neutral conductor, while the rated AC voltage is 400 V. The short-circuit withstand current Inc is 10 kA, which is important in networks where high fault currents may occur. The device supports conductor cross-sections from 1 to 35 mm², so it can be integrated into different wiring configurations inside switchboards. Mounting is carried out on a TH 35 DIN rail, which corresponds to standard modular installation in electrical distribution equipment. With a depth of 68 mm and an IP20 degree of protection, the unit is intended for installation inside enclosed switchboards, where it is protected against accidental contact with live parts. In practical use, the EFI-4 helps organize residual current protection in circuits supplying lighting, sockets, and other loads in three-phase networks. Its technical parameters — 100 A, 0.1 A, type AC, 3+N, 400 V, and 10 kA — define a device designed for differential protection of electrical installations under standard modular panel mounting conditions.