Type B residual current circuit-breakers are AC-DC sensitive. The NK characteristic provides classic fire protection at 300 mA for frequencies ranging from 0 to 150 kHz. Our NK circuit-breakers are ideally suited for the reliable protection of locations where a particular risk of fire exists. Standard RCCBs are designed for circuits with 230 V at 50 Hz.

AC/DC sensitive for residual currents with frequencies and mixed frequencies of 0 Hz (smooth direct current) up to 150 kHz, high availability even of voltage-independent detection of smooth DC residual current and AC residual current with frequencies not equal to 50/60 Hz thanks to full functional compatibility with mains voltages from at least 50 V AC on any two active conductors, mains-voltage-independent tripping when type A residual currents occur , compact design for all rated currents, high short-circuit resistance, double-sided two-tier terminals for large conductor cross-section and busbar, switch position indicator, viewing window for labels, multifunction switch toggle with three positions: "on", "off" and "tripped", Neutral conductor position left or right

quick fastening to mounting rail, any installation position, supply preferably from above

Commercial and industrial installations with TT, TN-S and TN-C-S systems, where power electronics equipment is used without galvanic isolation from the mains, e.g. frequency converters, switching power supplies, high-frequency converters, photovoltaic installations and UPS equipment with frequency converters without transformers, Facilities at risk of fire

suitable for use in 50 Hz AC networks, RCCBs for other frequencies available upon request, Not designed for use in direct current networks or on the output side of controlled electrical equipment such as frequency converters.

• Data sheet DFS2 025-2/0,03-B NK
• Operating instructions
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• Manual Manual RCDs Type B
• Technical information Tripping characteristics of DFS 4 Type B/B+
• Technical information dissipation power DFS 2/4
• Prospectus Circuit-breaker overview
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• Dimensional drawing Group view
• STEP file
• Wiring diagram
• Characteristic B NK 30 mA
• Labelling software DFS / DLS
• Download link Cadenas library