Doepke DFS4 100-4/0.30-B SK Residual Current Circuit Breaker (RCCB), 4-Pole, 100 A, 300 mA, Type B 09166998

In industrial and commercial electrical installations, the Doepke DFS4 100-4/0.30-B SK residual current circuit breaker provides reliable protection against earth fault currents. This 4-pole RCCB is rated at 100 A and offers a residual current sensitivity of 300 mA, making it suitable for circuits where higher leakage currents are expected. Its Type B classification ensures detection of smooth DC residual currents, AC residual currents, and pulsating DC residual currents, which is essential for equipment with rectifiers or frequency converters.

Key specifications

• Rated current: 100 A
• Number of poles: 4
• Rated residual current: 300 mA
• RCCB type: B
• Rated voltage: 230/400 V AC
• Rated frequency: 50/60 Hz
• Rated conditional short-circuit current: 10 kA
• Rated residual switching capacity: 1000 A
• Surge current withstand capability: 3 kA (8/20 µs)
• Mounting type: DIN rail (EN 60715)
• Number of modules: 4
• Degree of protection: IP20 (terminals), IP40 (housing)
• Terminal capacity: 1.5 - 50 mm² (solid), 1.5 - 35 mm² (stranded)
• Operating temperature range: -25 to +40 °C
• Tripping characteristic: Instantaneous
• Standards: VDE 0664-10, EN 61008-1

Why choose it

The DFS4 100-4/0.30-B SK offers robust protection for high-current circuits, with a compact 4-module design that saves space on the DIN rail. Its Type B sensitivity ensures compatibility with modern electrical systems that may generate smooth DC fault currents.

Ideal use cases

• Protection of three-phase circuits in industrial distribution boards
• Installations with frequency converters, UPS systems, or EV charging infrastructure
• Commercial buildings requiring high-current residual current protection

Good to know

The device is designed for DIN rail mounting and features screw terminals suitable for a wide range of conductor sizes. It complies with relevant VDE and EN standards for residual current devices.