DOEPKE DFS4 040-4/0,03-B SK Typ B FI ochranný spínač 4-pólový 40A 30mA 230/400V AC 9134988

With a rated residual current of just 30 mA and Type B all-current sensitivity, this 4-pole RCCB delivers advanced protection for circuits with DC fault currents, making it essential for modern installations with EV chargers, PV systems, or frequency inverters.

Overview

The DOEPKE DFS4 040-4/0,03-B SK is a 4-pole residual current circuit breaker (RCCB) with a rated current of 40 A and a rated residual current of 30 mA. It is designed for AC and pulsating DC residual currents, as well as smooth DC residual currents up to 2 kHz, thanks to its Type B classification. The device operates at a rated voltage of 230/400 V AC and 50/60 Hz, suitable for a wide range of applications.

What stands out

• Type B sensitivity detects all residual current types, including smooth DC, for comprehensive protection.
• Compact 4-module width (72 mm) saves space on DIN rails.
• High short-circuit withstand capability of 10 kA with suitable backup fuse.
• Surge current withstand up to 3 kA prevents nuisance tripping.
• Neutral conductor position on the right for standardized wiring.

Technical details

• Number of poles: 4
• Rated current (In): 40 A
• Rated residual current (IΔn): 30 mA
• Rated voltage (Un): 230/400 V AC
• Rated frequency: 50/60 Hz
• Rated impulse withstand voltage (Uimp): 4 kV
• Rated switching capacity: 500 A
• Short-circuit withstand current (Inc): 10 kA (with backup fuse)
• Surge current withstand capability: 3 kA
• Mounting type: DIN rail (EN 60715)
• Module width: 4 modules (72 mm)
• Terminal type: screw terminals
• Terminal capacity: 1.5 - 50 mm² (solid), 1.5 - 35 mm² (flexible)
• Operating temperature: -25 °C to +40 °C
• Protection degree: IP20 (terminals), IP40 (installed)
• Standards: VDE 0664-10, EN 61008-1, VDE 0664-40, EN 61008-2-1, IEC 61008-1, IEC 61008-2-1

Our verdict

The DOEPKE DFS4 040-4/0,03-B SK is a robust and reliable Type B RCCB that meets the highest safety standards. Its ability to detect smooth DC residual currents makes it indispensable for protecting modern electrical installations with electronic loads. The compact design and high withstand ratings ensure long-term performance in demanding environments.