The residual current circuit breaker, also known as the FI/LS switch, with the specifications 3x(1P+N), B-16 A, 6 kA and 30 mA Type A, provides combined protection against overcurrent and residual currents. Type A detects sinusoidal AC and pulsating DC fault currents. Suitable for installation in residential and commercial areas. Optimises safety and system availability.