TECNOLOGIE ELETTROTECNICHE ED ELETTRONICHE PER INSTALLAZIONI ELETTRICHE

 

DIFFERENTIAL RELAYS

Ground fault relays, operation in conjunction with toroidal differential current transformers, application in
LT grids with TT, IT, TNS systems. The relay triggers whenever, due to a leakage towards ground on one or
more conductors, the current vectors summation is above the set point.

• RD21 - Selectable set point: 30mA or 300mA. Selectable intervention time: instantaneous or 100mS. Test and Reset
  buttons. LED indicators: Power supply and Alarm

• RD22 - Selectable set point: 30mA or 30A. Selectable intervention time: 0 to 5s. 19 selectable ranges. Harmonics
  filtering device. Field selectable positive or negative safety (fail safe). Test and Reset buttons. LED indicators:
  Power supply and Alarm

• RD23 - Selectable set point: 30mA or 30A. Selectable intervention time: 0 to 5s. 19 selectable ranges. Harmonics
  filtering device. Indication of instantaneous differential current. Field selectable positive or negative safety
  (fail safe). Test and Reset buttons. LED indicators: Power supply and Alarm.

• RD2T - Selectable set point: 30mA or 300mA. Selectable intervention time: instantaneous or 100ms. Test and Reset
  buttons. LED indicators: Power supply and Alarm. On-board ring toroidal transformer with Ø 20mm cable
  pass-through hole.