Siemens 3RP25

Single function devices
6.6 Star-delta (wye-delta) function
3RP25 Time Relays
Manual, 09/2019, A5E31947765002A/RS-AC/003
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6.6 Star-delta (wye-delta) function
3RP2574 / 3RP2576 time relay
The time relay contains 2 NO contacts.
The instantaneous star contact and the time-delayed delta contact share the same contact
root. To avoid interphase short circuits, the changeover delay from star (wye) to delta is
50 ms.
Time ranges
Each relay has a fixed time range:
● 1 s - 20 s (3RP2574)
● 3 s - 60 s (3RP2576)
Note
Changes to the time range (time range and operating time) only take effect if made in the
deenergized state.
Function table
Function Function chart Circuit diagram Time relay
2 NO contacts
Star-delta (wye-delta) function 3RP2
574-.NW30
3RP2576-.NW30
3RP2574-.NM20
3RP2576-.NM20