Type B residual current circuit breakers are sensitive to all currents. The SK series ensures reliable protection with maximum system availability. With low sensitivity to differential currents at higher frequencies, our SK switches are perfect for use in workplaces that do not require fire protection. Standard devices are designed for circuits with 230/400 V at 50 Hz. Our ISO switches allow for insulation testing up to 1000 V without the need for prior disconnection, saving you valuable time during maintenance. In HD version, our switches are particularly resistant to harmful environmental influences, making them suitable for harsh environments.