The Gewiss GW90929B is a Restart Autotest Pro automatic reclosing residual current device (ARD) designed for enhanced electrical safety. This 4-pole device has a rated current of 63A and a residual current sensitivity of 300mA. It features a Type B[IR] tripping characteristic, making it suitable for installations with complex loads that generate smooth DC residual currents. The Autotest function periodically verifies the RCD's operation without interrupting the power supply, while the Restart function automatically recloses the device after a transient fault, ensuring continuity of service. It occupies 7 modules in a distribution board.