and Operation

The basis for the AC/DC-sensitive device comprises a pulsating current-sensitive protective switching unit with a release that    
operates independently. The following diagram shows the fundamental construction.

 

The electrical install installation for alternating and pulsating formedFault currents. The summation current transformer W2detectsThe smooth DC fault currents and gives a swith-off signalvia the electronic unit E to the release A.For the purpose of a highly secure supply, the power supplyFor the electronic unit comes from all three phase conductorsand the neutral conductor. Besides, it is designed such thatthe electronics still operate at a voltage reduction of 70%(e.g. between phase conductor and neutral conductor).Consequently the tripping due to smooth DC fault currentIs provided for whenever such forms of fault current appear,Also during disturbances of the electric supply networkE.g. when the neutral conductor is interrupted. Even in theExtremely improbable case that two phase conductors andThe neutral conductor are lost and the remaining intact phaseConductor is a fire hazard due to an earth fault, protectionIs then provided by the pulsating current sensitive swithingPart which, due to its supply-independent release, reliablySwitches the RCCB off.

M Mechanice of the protective device
E Electronics for tripping smooth DC fault currents
T Test button
N Secondary winding
W2 Summation transformer for detection of smooth DC Fault currents

  The Type

Type            Rated current l. (A)           Rated fault current   Approvals and main

                   AC230/440Y                         1  (m A)          certifications            Remarks

AC                            16            10                   10.30.100.300.500       CE,CB SEMKO, RoHs  For AC fault currents

A                              16            10                   10.30.100.300.500  CE,CB SEMKO, RoHs  For AC,pulsating DC fault currents
The POPP supplies range studied to meet all the requirements concerning electrical installations consists of two main product families
AC type: Residual Current operated Circuit-breakers(RCCBs)for AC fault currents:
Atype: Resldual Current operated Circuit operated Circuit-Breakers(RCCBs)for AC and pulsating DC fault currents.