Residual current device ETI EFI-4 80/0.5 Type A 10kA (2065545)

ETI EFI-4 is a residual current device designed to disconnect an electrical circuit when leakage current appears and to improve the safety of operation in distribution boards. It is intended for installation in residential, commercial, and industrial switchgear where reliable differential protection is required for three-phase circuits with a neutral conductor. The device has a 3+N pole configuration, which makes it suitable for three-phase networks with neutral. Its rated current is 80 A, while the rated residual operating current is 0.5 A. This sensitivity level is used where monitoring of leakage current is needed without unnecessary tripping from minor natural leakage values. Type A means the device responds not only to sinusoidal alternating residual currents, but also to pulsating direct residual currents, which is important for circuits with modern electrical loads. The EFI-4 is designed for mounting on a TH 35 rail, allowing straightforward integration into standard modular switchboards and control cabinets. With a depth of 68 mm, the device should be considered during panel layout and space planning. The connection range of 1 mm² to 25 mm² makes it compatible with common wiring solutions used in distribution assemblies. Rated for 400 V AC and a frequency of 50/60 Hz, this residual current device is suitable for standard three-phase low-voltage systems. The Inc short-circuit current rating of 10 kA defines its ability to operate in networks where significant fault currents may occur. Protection degree IP20 indicates basic protection against access to live parts, so the device is intended for installation inside enclosed electrical cabinets. The device complies with IEC/EN 61008, the standard that defines requirements for residual current operated protective devices without integral overcurrent protection. In practice, this makes EFI-4 80/0.5 Type A a functional solution for differential protection in installations where three-phase supply, neutral conductor presence, Type A sensitivity, DIN-rail mounting, and compatibility with standard switchboard equipment are required.