SPR3: 3 PHASE (3 WIRES)
SPR3/N: 3 PHASE N (4 WIRES)
This three phase (3 & 4 wire) unit monitors the supply voltage and combines the protection features of the SMP1 and TWCP1. The output relay energizes if the phases are all present, in the correct sequence and each voltage is to within the adjustable over and undervoltage limits.
The relay de-energizes on:
a. Phase voltage imbalance exceeding the 10% (preset)
b. Total failure of one or more phases.
c. Incorrect phase sequence.
d. Any phase falling outside the set voltage range.
Build-in optional facilities:
- External latch N/C.
- 10 sec start up delay.
- 180 sec fault restart delay.
These facilities can be utilized by connecting external links as per the diagram below.
