6
Instruction Booklet
IB019013EN
Effective March 2019
Zone selective interlocking test kit
For Digitrip 520M, 520MC and 1150 trip units
EATON
www.eaton.com
ZSI
Test
Box
Zone 1
Zone 2
Zone 3
Main2 Digitrip
Tie Digitrip
Main1 Feeder Digitrip
Configuration 2
Main Tie Main
Configuration 2
Arrangement
double
Main fault: This simulates a fault originating
between the M2 (main 2) breaker and the tie
breaker.
Tie fault: This simulates a fault originating
downstream of the M2 (main 2) breaker and
tie breaker.
Feeder fault: This simulates a fault originating
on the load side of a feeder on the main 1 bus
(main 1 feeder). This fault would flow through
main 2, the tie breaker, and the main 1 feeder
breaker.