Residual current circuit-breakers (RCCB) switch the power supply off if dangerous high residual currents occur. Series DFS 4 devices are compact two or four-pole residual current circuit-breakers. In the standard design, they only take up four module width units of space. Although DFS 4 devices for AC and pulsating DC residual currents are actually designed for three-phase networks, they can also be used in single-phase networks. However, in addition to these, special variants are also available for single or three-phase operation in the form of the AC/DC sensitive designs (type B, type B+). In spite of the compact dimensions, a number of different tripping currents and characteristics are available at rated currents, depending on the design, up to 125 A. All devices are available in the "HD" design, which is especially suitable for use in extreme environments (tunnels, swimming pools, etc.) They also have large two-tier terminals for large conductor cross-sections, a practical multifunctional switch toggle and can be provided with pre-prepared labels using free-of-charge software. DFS 2 and DFS 4 devices with residual current characteristic B detect smooth DC residual currents as well as all other Type B residual currents as per IEC 60755. The operating voltage required for this is taken from the mains supply. Correct power supply is ensured when the voltage between the mains conductors is ≥ 50 V. Type A residual currents are detected regardless of the mains voltage. Furthermore, these residual current circuit-breakers completely detect residual currents of all frequencies up to 100 kHz. With this wide frequency range for residual current detection, it more than meets the requirements for the design standards for type B residual current circuit-breakers. Protection as per VDE 0100 part 410 is provided with a corresponding earth resistance via the entire frequency range of residual current detection. The maximum permissible earth resistance is calculated as the quotient from the permissible touch voltage and the maximum trip residual current in the entire detected frequency range. For residual current circuit-breakers with characteristic curve SK, the frequency response of the tripping current is designed so that residual currents with high frequencies, such as in the clock frequency range for frequency converters, as opposed to the rated frequency are detected with significantly reduced sensitivity. Undesired trips caused by leakage currents can therefore be widely avoided. However, fire protection depending on the rated residual current of the switch (0.03 A, 0.1 A or 0.3 A) is only provided for residual currents with frequencies up to 1 kHz, 300 Hz or 100 Hz, while the devices with tripping current frequency response B+ or NK offer protection over the entire tripping frequency range up to 20 kHz or 150 kHz, respectively. Push-buttons for disconnection in emergency situations can be connected to residual current circuit breakers in the NA design (NA for emergency switching off). An integrated LED indicates the emergency tripping by a push-button or wire break. The residual current circuit breaker can be reactivated once the fault has been rectified. Several RCCBs can be connected in parallel. With an airtight, encapsulated tripping mechanism from a special alloy and the stainless steel latch, residual current circuit-breakers in HD design are protected, in particular from corrosion, corrosive gases, moisture and extreme temperature fluctuations.

High level of immunity against leakage and residual currents due to operational conditions from frequency 1 kHz and higher, 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 , With emergency switching off function for tripping or disconnection by means of control elements, Monitoring of emergency switching off function for wire breakage and signalling by LED, In the event of a power failure, the emergency switching off function does not trip, 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

quick fastening to mounting rail, any installation position, supply from top

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, NA series RCCBs are especially suitable for systems where an emergency switching off circuit with disconnecter properties is required, e.g. in teaching rooms or production facilities.

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.

• Technical information dissipation power DFS 2/4
• Prospectus Circuit-breaker overview
• Prospectus DFS HD "heavy duty"
• Text for invitation to tender RTF
• Text for invitation to tender GAEB XML
• Text for invitation to tender GAEB 2000
• Text for invitation to tender GAEB 90
• Dimensional drawing Group view
• STEP file
• Wiring diagram
• Wiring diagram additional file
• Characteristic B SK 30 mA
• Labelling software DFS / DLS
• Download link Cadenas library
• Operating instructions
• Data sheet
• Prospectus Power for building sites
• Technical information Derating Graph for DFS 2/4
• Prospectus Complete RCCB brochure
• Prospectus DFS 2 B/ 4 B
• Manual Manual RCDs Type B
• Prospectus DFS 4 NA
• Technical information Tripping Characteristics for DFS 4 Type B/B+