ABB IRP Instruction Leaflet page 21

Directional Overcurrent Ground Relays
Types IRP, IRC and IRD
1) Instantaneous Overcurrent
Unit
2) Stationary Contact
3) Moving Contact.
4) Saturating Transformer
5) Tap Block
#2
#4
Figure 5: Instantaneous Overcurrent Unit
Figure 6: Indicating contactor Switch (ICS)
41-133S
#3
#1
#5
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