ETI EFI-4 Residual Current Device 4P 80A 30 mA Type AC 10kA (2062145)

The ETI EFI-4 residual current device is intended for protection of electrical circuits against leakage currents and for improving personnel safety during operation of low-voltage networks. It is commonly used in distribution boards of residential, commercial, and small industrial installations where automatic disconnection is required when a dangerous differential current appears. This model is designed in a 3+N pole configuration, meaning three phase poles plus neutral, which makes it suitable for three-phase systems with neutral conductor. The rated current is 80 A, so the device can be integrated into circuits with relatively higher load demand. Its residual current sensitivity is 30 mA, allowing it to detect leakage currents caused by damaged insulation, faulty equipment, or accidental current paths. Type AC indicates response to sinusoidal alternating residual current, which is the standard application mode for many conventional AC circuits. The device is rated for 415 V AC and operates at 50/60 Hz, so it can be used in common three-phase power networks. The short-circuit withstand current Inc is 10 kA, which is an important parameter for selecting the device in installations with a corresponding prospective fault current level. Compliance with IEC/EN 61008 confirms that it belongs to the category of residual current-operated protective devices and meets the relevant technical requirements for this type of equipment. For installation, the unit is mounted on a TH 35 DIN rail, which is standard for modular switchboards. The body depth is 68 mm, helping to define the available space in the enclosure during panel design. The permissible conductor cross-section is 1 to 25 mm², which supports connection of a wide range of cable and wire sizes used in power distribution circuits. The IP20 protection rating means the device is intended for installation inside a closed electrical enclosure, where access to live parts is limited. ETI EFI-4 is therefore suitable as a residual current protection element for feeder and group circuits in systems that require three-phase supply with neutral, 30 mA sensitivity, and 10 kA short-circuit capability.