Residual current circuit breakers (RCCBs) switch off the power supply when dangerously high residual currents occur. They thus protect people, animals and systems. DFS 4 are two- or four-pole residual current circuit breakers for single- or three-phase networks. In the standard version, the compact devices are four division units wide. They are available with many different residual current types and versions with rated currents of up to 125 A. The large double-deck terminals can also accommodate large conductor cross-sections. The tripped position of the multi-function switch toggle makes troubleshooting easier. The free label software helps with labeling. Type F switches are mixed frequency sensitive. They protect against pulse and alternating residual currents as well as residual currents with mixed frequencies deviating from 50 Hz, regardless of the mains voltage. They are resistant to increased surge currents and storms. Standard devices are designed for monitoring circuits with a rated voltage of 230 V/400 V and a rated frequency of 50 Hz. Properties: - sensitive to alternating and pulsating direct fault currents of the mains frequency (Type A) as well as alternating fault currents with mixed frequencies 50Hz - high immunity to surge fault currents and mains voltage-driven follow-on current pulses - small size for all rated currents, - high short-circuit strength, - double-sided double-deck terminals for large conductor cross-sections and busbar connections, - switch position indicator, - viewing window for labeling labels, - multifunctional switch toggle with three positions: 'on', 'off', 'tripped', - also available in the 'HD' version - neutral conductor position on the left, also available as N on the right at no extra charge. Mounting type: - Quick attachment to mounting rail - Any installation position - Any feed direction Areas of application: - Modern house installations with LED lighting systems and single-phase frequency converters., - Ideal for systems in which type A RCCBs are prone to false tripping due to surge fault currents., - Commercial and industrial installations with TN-S, TT and TN-CS systems in which power electronics equipment is used without galvanic mains isolation, such as switched-mode power supplies, high-frequency power converters, photovoltaic and UPS systems with transformerless inverters., - Not suitable for use in TN-C networks or for protecting systems in which electronic equipment can cause smooth DC fault currents. Comprehensive protection is not provided here. For such applications we recommend our universal current-sensitive residual current circuit breakers (type B or B+). Notes: - suitable for use in 50 Hz AC networks, - Not intended for use in DC networks or on the output side of controlled electrical equipment such as frequency converters.
