This FAQ has been written for NEAL (North East Africa and Levant) region. If you are looking for information for another region, please select the correct country from the top-left dropdown in the page and 'Navigate to Browse FAQs' in the Support menu.
Why there is mentioned Insulation level of DC (Ui) on the circuit breaker while we are using the breaker on AC power supply, like in NSX series Ui = 800V ?
Please find the following:
The Ui: Rated insulation voltage and Uimp: Rated impulses withstand voltage
It is the same like the CB tested according the IEC60947-2 which is given under Dielectric tests.
However for routine test only dielectric test at 50 Hz, required, the voltage depends on the Ui:
300< Ui < 690V: 2500V
690< Ui <800V: 3000V
800< Ui <1000V: 3500V.
Released for: Schneider Electric Egypt and North East Africa
