Residual current device ETI EFI-4 100/0.03 A type AC 10kA (2062151)

This residual current device from ETI, series EFI-4, is intended for protection of electrical circuits against leakage currents and for improving the safety of electrical installations in residential, commercial, and small industrial distribution boards. It continuously monitors the difference between the current in the phase and neutral conductors and disconnects the circuit when a dangerous leakage is detected. Such operation helps reduce the risk of electric shock and limits the likelihood of insulation damage and equipment faults. The device is rated for a nominal current of 100 A and an AC operating voltage of 400 V. The residual operating current is 0.03 A, which means the unit is suitable for circuits where high sensitivity to leakage currents is required. Type AC indicates response to sinusoidal alternating residual current, so the device is designed for standard AC networks and typical load conditions. The 3+N pole configuration provides four-pole protection and makes the device suitable for three-phase circuits with a neutral conductor. Installation is performed on a TH 35 DIN rail, which ensures straightforward mounting in modular distribution cabinets and compatibility with standard electrical apparatus layouts. With a body depth of 68 mm, the device can be installed in panels with limited space while still allowing practical wiring and servicing. The rated conductor cross-section range of 1 to 35 mm² gives flexibility when connecting different cable sizes without the need for special transition elements. The short-circuit current rating Inc is 10 kA, supporting operation in installations where higher fault currents may occur. The IP20 protection degree indicates indoor use inside an electrical enclosure, under appropriate mounting conditions. Compliance with IEC/EN 61008 defines the basic requirements for residual current devices and confirms that the product is intended for protective disconnection in distribution systems. Overall, this model is suitable for building differential protection schemes where precise tripping, modular installation, and operation in 400 V networks are required.