Thermal-magnetic circuit breaker DFL 8 160-4/0,03-B SK

4-poleresidual currentautomatic

CBRs (circuit-breakers with integral residual current protection) are circuit-breakers with a magnetic and thermal overcurrent trip and a residual current trip. The circuit-breaker with residual current trip is used for overcurrent protection of equipment, cables and lines in accordance with DIN VDE 0100-430 and for protection against electrical shock by automatic switch-off of the power supply as per DIN VDE 0100-410. This series contains compact devices for rated currents up to 250 A with integrated auxiliary switch and terminals for large cable cross-sections. The devices are preferably mounted on a mounting plate. AC/DC sensitive switches with residual current characteristic B detect smooth DC residual currents as well as all other type B residual currents in a frequency range up to 100 kHz. The evaluation unit integrated for this purpose required an operating voltage taken from the mains supply. Correct power supply is ensured when a minimum voltage of 50 V exists between just any two current paths. The type A residual current detection (AC and pulsating DC residual currents) is completely independent of the mains voltage and also provides protection even when just one active conductor has voltage to earth and an earth fault occurs. For switches 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