The Doepke GmbH FI circuit breaker DFS4 040-4/0.10-B SK is a highly advanced residual current device designed for use in single-phase and three-phase networks. With its all-current sensitive technology, it provides comprehensive protection against dangerous residual currents that can pose risks to both people and equipment. The switch is available in a compact design that occupies only four modular units and is rated for a voltage of up to 400 V. Its high immunity to operational leakage and fault currents at frequencies starting from 1 kHz makes it particularly suitable for demanding applications. Additionally, the tripped position of the multifunction switch lever allows for easy fault diagnosis, while the free labeling software simplifies the labeling process. The DFS4 is not only resistant to surge currents and lightning but is also optimized for systems where fire protection is not required, highlighting its versatility and reliability.

• All-current sensitive for frequencies from 0 Hz to 150 kHz
• High immunity to operational leakage and fault currents from 1 kHz
• Easy fault diagnosis through the tripped position of the multifunction switch lever
• Optimized for systems without fire protection requirements
• Compact design with only four modular units.