5
Instruction Booklet
IB019013EN
Effective March 2019
Zone selective interlocking test kit
For Digitrip 520M, 520MC and 1150 trip units
EATON
www.eaton.com
Zone configurations
The figures below depict some of the most common ZSI wiring schemes. These configurations
describe how to connect the ZSI plugs to the breakers to be tested and where each zone plug should be
connected to the corresponding receptacle on the test box. The table below each figure describes the
ZSI wiring scheme configuration and what the ZSI test box is testing on each configuration based on the
selections made on the HMI. Circuit diagrams of these setups can be found in the “Zone Config” screen
subsection of the “Navigating the HMI Screens” section in this manual.
otee:
N
For M-T-T-M, repeat test for each tie breaker.
ZSI
Test
Box
Zone 1
Zone 2
Zone 3
Main1 Digitrip
Tie Digitrip
Main2 Feeder Digitrip
Configuration 1
Main Tie Main
Configuration 1
Arrangement
double
Main fault: This simulates a fault originating
between the M1 (main 1) breaker and the tie
breaker
Tie fault: This simulates a fault on originating
downstream of the M1 (main 1) breaker and
the tie breaker.
Feeder fault: This simulates a fault originating
on the load side of a feeder on the main 2 bus
(main 2 feeder). This fault would flow through
main 1, the tie breaker, and the main 2 feeder
breaker.
