DET-653C
EntelliGuard
®
G Circuit Breaker Application Guide
24-May-12
Section 3. EntelliGuard
®
TU Trip Unit System
©2012 General Electric All Rights Reserved
12
•
Instantaneous selectivity between a circuit breaker with an EntelliGuard TU trip Unit and any non-current limiting circuit breaker may be evaluated via
traditional time current curve analysis or simply multiplying the upstream instantaneous trip setting by .9 which accounts for the tolerance of the line
side circuit breaker around the nominal setting. If The EntelliGuard TU's Instantaneous zone selective interlocking capability between similarly equipped
circuit breakers is employed then selectivity up to the upstream circuit breaker's full withstand or short circuit rating is possible.
The table below identifies maximum instantaneous pickup multipliers possible for various types and sizes of GE circuit
breakers. Lower part of table identifies the maximum instantaneous pickup in amperes for various circuit breaker, sensor and
rating plug combinations.
Table 3.2. Maximum Instantaneous Pickup Multipliers for GE Circuit Breakers
Line side device with Entelliguard TU Trip Unit
PowerBreak II,
UL 489 CB
WavePro or AKR,
ANSI CB
EntelliGuard G,
ANSI/UL Std I
EntelliGuard
G, ANSI Ext I
Max Instantaneous in X
Max Instantaneous in X
Frame
determines
maximum
instantaneous
pickup (X) for PB2
and WP CB.
Plug/Icw ratio
determines
maximum
possible for
EntelliGuard G
CB. EntelliGuard
values shown are
more maximum
withstand tiers.
800A frame
15
15
15
30
1600A frame
15
15
15
30
2000A frame
15
15
15
30
2500A frame
13
N/A
15
30
3000A frame
13
N/A
15
30
3200A frame
N/A
13
15
30
4000A frame
10
10
15
23
5000A frame
N/A
7
15
19
6000A frame
N/A
N/A
15
16
Amperes
Amperes
800A frame, 800A plug
12,000
12,000
12,000
24,000
1600A frame, 1600A plug
24,000
24,000
24,000
48,000
2000A frame, 2000A plug
30,000
30,000
30,000
60,000
2500A frame, 2500A plug
32,500
N/A
37,500
75,000
3000A frame, 3000A plug
39,000
N/A
45,000
90,000
3200A frame, 3200A plug
N/A
41,600
48,000
96,000
4000A frame, 4000A plug
40,000
52,000
60,000
92,000
5000A frame, 5000A plug
N/A
65,000
75,000
95,000
6000A frame, 6000A plug
N/A
N/A
90,000
96,000
Maximum instantaneous is a multiple of rating plug, the above values may be lower if a smaller rating plug than
maximum for frame is used. In PB2 & WavePro CB maximum instantaneous multiplier is limited by frame rating. In
Entelliguard G the maximum Instantaneous X may be limited by circuit breaker withstand or short time rating (also
known as Icw).
