Brochure

PowerPact H-, J-, and L-Frame Circuit Breakers
Trip Units
91
02/2016
© 2011–2016 Schneider Electric
All Rights Reserved
Zone Selective Interlocking (ZSI)
A ZSI terminal block may be used to interconnect a number of Micrologic trip units to provide zone
selective interlocking for short-time (I
sd
) and ground-fault (I
g
) protection, without a time delay. For
PowerPact H- and J-frame circuit breakers, the ZSI function is available only in relation to the
upstream circuit breaker (ZSI out). For PowerPact L-frame circuit breakers, the ZSI function is
available in relation to the upstream circuit breaker (ZSI out) and downstream circuit breakers (ZSI in).
Display of Type of Fault.
On a fault trip, the type of fault (I
r
, I
sd
, I
i
, I
g
), the
phase concerned and the interrupted current are
displayed. An external power supply is required.
Indicators
Front Indicators
• The green “Ready” LED blinks slowly when the electronic trip unit is ready to provide protection. It
indicates the trip unit is operating correctly.
• Orange overload pre-alarm LED stays on when I > 90% I
r
• Red overload LED stays on when I > 105% I
r
Remote Indicators
An SDx relay module installed inside the circuit breaker can be used to remote the following
information:
• overload trip
• overload prealarm (Micrologic 5 trip units) or ground fault trip (Micrologic 6 trip units)
This module receives the signal from the Micrologic electronic trip unit through an optical link and
makes it available on the terminal block. The signal is cleared when the circuit breaker is closed.
Note: all the trip units have a transparent sealable cover.
These outputs can be reprogrammed to be assigned to other types of tripping or that protects access
to the adjustment rotary switch. The module is described in detail in the section dealing with
accessories.
Isd Fault
Fault Phase
Interrupted Current
Display of Interrupted Current.
Green
LED
Yellow
LED
Red
LED
SDx Module
x