The Doepke DFS4 040-4/0.50-B SK S is a highly advanced residual current circuit breaker designed for use in single-phase and three-phase networks. This switch provides reliable protection for people, animals, and electrical systems by automatically disconnecting the power supply in the event of dangerously high fault currents. With a compact design that occupies only four modular units, the DFS4 is both space-saving and powerful. It can accommodate large conductor cross-sections through its large double-deck terminals, facilitating installation. The tripped position of the multifunction switch knob aids in troubleshooting, while the free labeling software simplifies the labeling process. The Type B switch is all-current sensitive and offers protection at frequencies from 0 Hz to 150 kHz, making it particularly robust against interference. The selective characteristics of the device ensure that only the affected section of the system is shut down in the event of a fault, increasing the availability of the entire system.

• Two- or four-pole design for flexible applications
• All-current sensitive at frequencies from 0 Hz to 150 kHz
• Reduced sensitivity at higher frequencies
• Easy troubleshooting with multifunction switch knob
• Suitable for tiered distributions with selective protection.