Residual current device ETI EFI-4 80/0.1 A type A 10kA (2063545)

ETI EFI-4 is a residual current device intended for monitoring leakage currents in electrical networks and disconnecting the circuit when a dangerous imbalance of currents occurs. It is used in distribution boards of residential, commercial, and industrial facilities where protection of people and electrical equipment against fault currents to earth is required. The 3+N pole configuration makes this device suitable for four-wire networks with a neutral conductor. This model is rated for 80 A and has a residual current sensitivity of 0.1 A, which allows it to be used in circuits with the corresponding load level and increased requirements for differential protection. The type A tripping characteristic means that the device responds not only to sinusoidal alternating residual current, but also to pulsating direct residual current. This is important for circuits supplied by modern electrical appliances and electronic power supplies, where such leakage components may occur. The rated AC voltage is 415 V, and the operating frequency is 50/60 Hz, so the device is suitable for common three-phase power systems. The short-circuit current rating Inc is 10 kA, which indicates increased resistance to fault conditions in installations where higher protective performance is required. Installation is carried out on a TH 35 DIN rail, making integration into standard modular switchboards straightforward. The housing depth is 68 mm, which should be considered during panel planning and layout. The device supports conductor cross-sections from 1 to 25 mm², providing compatibility with common distribution wiring. It complies with IEC/EN 61008, confirming its conformity to the applicable standard for residual current devices without integral overcurrent protection. The IP20 degree of protection means the device is designed for installation inside an electrical enclosure, where access to live parts is limited by the switchboard structure. Overall, this residual current device is a practical solution for circuit protection in systems that require reliable leakage-current monitoring and selective disconnection under fault conditions.