DET-653C EntelliGuard
®
G Circuit Breaker Application Guide
24-May-12 Section 3. EntelliGuard TU Trip Unit System
©2012 General Electric All Rights Reserved
Table 3.1. EntelliGuard Selectivity Above GE Current Limiting Circuit Breakers
Selectivity between any line side (main)Circuit Breaker with a GE EntelliGuard TU trip unit and a load side (branch) GE current
limiting circuit breaker, and certain lighting panel type circuit breakers is determined based on the setting of the line side
EntelliGuard TU Trip. When the line side EntelliGuard TU Trip unit is set at the value defined in the table or higher the pair is
selective over the instantaneous range of the upstream CB up to the limit defined in the table below. The required settings are
independent of the line side circuit breaker type and only depend on the load side current limiting circuit breaker. The table
below identifies the values for GE's currently produced UL listed current limiting molded case circuit breakers.
Extent of selectivity will depend on line side circuit breaker type. The table below describes how that selectivity is limited by
circuit breaker type.
The table below applies at 208 through 480 Volts except where specifically limited to 240V and lower.
Notes:
1. EntelliGuard TU must employ a 400A rating plug or larger
2. EntelliGuard TU must employ an 800A rating plug or larger
3. Any instantaneous overlap seen in time current curves when line side CB is set per table does not indicate a lack of
selectivity and may be ignored.
Load side (branch)
devices
Line side (Main) device with EntelliGuard TU trip unit
Frame
Designation
Maximu
m Trip
(frame
or
sensor)
EntelliGuard TU
instantaneous
setting must be
> than (3)
PowerBreak
II, UL 489 CB
AKR or AK,
or other
ANSI CB
without a
mechanical
EntelliGuard
G, UL489 CB
EntelliGuard
G, ANSI CB
20,350A
Up to short
circuit rating;
65kA, 100kA
or 150kA at
480V, and
200kA at
240V
Up to short
circuit rating;
65kA, 100kA
or 150kA at
480V.
Up to
withstand
rating; 42kA,
50kA, 65kA,
85kA or
100kA at
480V
Up to
withstand
rating; 65kA,
85kA or
100kA at
480V
9,900A (1)
100A 7,190A
29,980A
15-60A 9,900A (1) 22,000A 22,000A 22,000A 22,000A