Residual current device ETI EFI-4 80/0.3 type AC 10kA (2064145)

ETI EFI-4 is a residual current device intended to detect leakage currents and disconnect the circuit automatically when dangerous operating conditions occur. It is used in distribution boards of residential, commercial, and small industrial installations where continuous monitoring of lines and an increased level of electrical safety are required. As a residual current relay, this device is designed for AC networks with a rated voltage of 415 V and a frequency of 50/60 Hz. The unit is rated for a nominal current of 80 A and a residual operating current of 0.3 A. Its AC type means it responds to sinusoidal alternating differential currents, so it is suitable for circuits where this type of leakage current is expected. The 3+N pole configuration provides protection for a three-phase network with a neutral conductor, which makes the device appropriate for group and power circuits with the corresponding connection scheme. The rated short-circuit current Inc is 10 kA, which is important for use in systems with higher requirements for interruption capability. The device is mounted on a TH 35 DIN rail, allowing easy installation in standard modular distribution boards together with other protection and control devices. The body depth of 68 mm should be taken into account during panel design to ensure sufficient mounting space. Connection is possible with conductors in the 1 to 25 mm² range, which supports common power wiring solutions. The IP20 degree of protection indicates basic protection against contact with live parts, so the device is intended for installation inside electrical enclosures only. Compliance with IEC/EN 61008 confirms that it meets the requirements for residual current devices without integrated overcurrent protection.