Residual current device ETI EFI-4 100 A 0.1 A type A 10kA (2062152)

The ETI EFI-4 residual current device is intended for monitoring leakage currents in electrical circuits and disconnecting the supply when a dangerous current imbalance occurs. It is used in distribution boards of residential, commercial, and administrative buildings where protection of people and electrical installations against electric shock and the effects of insulation damage is required. This model belongs to the differential relay category and is rated for a current of 100 A. The rated residual operating current is 0.1 A, which makes the device suitable for circuits where elevated leakage control is needed. Type A indicates response not only to sinusoidal alternating residual current, but also to pulsating direct residual current, expanding its application in networks that include modern electronic equipment. The rated AC voltage is 400 V. Structurally, the device is designed in a 3+N version, meaning it is intended for three-phase networks with a neutral conductor. DIN-rail mounting on TH 35 simplifies installation in standard modular enclosures. The housing depth is 68 mm, which should be considered when planning available installation space inside the distribution board. The device supports conductor cross-sections from 1 to 35 mm², ensuring compatibility with common electrical wiring schemes. The short-circuit rated current Inc is 10 kA, which confirms its suitability for operation in networks with the specified level of short-time current stress. The device complies with IEC/EN 61008, and the IP20 protection rating is typical for installation inside electrical switchboards, where protection against access to hazardous parts is provided. With these characteristics, the residual current device serves as a differential protection element in three-phase power systems and helps maintain circuit safety in a wide range of installations.