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Adjustable Selective Instantaneous Protection; Reduced Energy Let-through Instantaneous Protection (relt); Table 3: Short Time Delay Slope Settings; Table 4: Maximum Instantaneous For Power Break I, Power Break I, Wavepro And Akr Trip Units - GE EntelliGuard TU Installation, Operation And Maintenance Manual

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EntelliGuard®TU Trip Unit
Section 1 – General Information

Table 3: Short Time Delay Slope Settings

Band
TDB Setting
1
2
3
4
5
6
7
8
9
10
11

Adjustable Selective Instantaneous Protection

Adjustable Selective Instantaneous over current
protection causes an undelayed breaker trip when the
chosen current level and proper waveform is reached.
The pickup value may be set in steps of 0.5 xIn from 2.0
xIn to 15 xIn and steps of 1 xIn from 15 xIn to a maximum
of 30 xIn. Greater than 15xIn is available only in trips
provided with the "Extended Range Instantaneous"
option on ANSI EntelliGuard G circuit breakers.
The maximum possible setting depends on the trip unit
instantaneous option provided, the circuit breaker's
withstand capability and whether or not ST has been
enabled.
Table 4: Maximum Instantaneous For Power Break I,
Power Break II, WavePro and AKR Trip Units
Frame
ANSI (X In)
(A)
With ST
W/O ST
800
15
10
1,600
15
10
2,000
15
10
2,500
-
3,000
-
3,200
13
10
4000
9
5000
7
The Instantaneous pickup accuracy is 10%. On trip units
with the user-selectable switchable instantaneous over
current and ground-fault option, an additional value of
OFF appears at the end of the listing of numerical values.
Choose this setting to disable instantaneous protection,
and or GF protections.
10
Courtesy of NationalSwitchgear.com
Commit Time
50 Hz
Min.
0.030
2nd
0.040
3rd
0.050
4th
0.060
5th
0.110
6th
0.130
7th
0.180
8th
0.210
9th
0.240
10th
0.280
Max.
0.340
UL (X In)
With ST
W/O ST
15
10
15
10
15
10
13
10
-
13
10
-
-
-
9
9
9
7
-
-
60 Hz
Clear Time 60 Hz
0.025
0.080
0.033
0.088
0.042
0.097
0.058
0.113
0.092
0.147
0.117
0.172
0.158
0.213
0.183
0.238
0.217
0.272
0.350
0.405
0.417
0.472
Short Time and Instantaneous cannot be turned off
simultaneously. Only ANSI circuit breakers may have the
Instantaneous off option. Trips with GF off as an option
are not UL listed.
When Instantaneous pickup is set above the maximum
allowed for the CB without ST on, ST pickup is
automatically switched on at a default delay is
automatically switched on at a minimum delay setting.
Reduced Energy Let-Through Instantaneous
Protection (RELT)
EntelliGuard G Trip Units provide a Reduced Let-Through
Energy Instantaneous function (RELT) which may be
enabled at the trip's key pad, via a 24 VDC/AC signal to
INPUT 1 or via serial communications. The RELT function
provides a faster instantaneous trip function that may be
used in case faster and more sensitive protection is
required temporarily.
The pickup value may be set in steps of 0.5 xIn from
1.5 xIn to 15xIn or the maximum allowed instantaneous
pickup for the particular circuit breaker type, rating and
size. The maximum setting depends on the trip unit
catalog number, breaker type and frame, and whether or
not ST is enabled. See Table 6.
© 2008 General Electric All Rights Reserved
09/25/08
EntelliGuard G
Clear Time 50 Hz
0.085
0.093
0.102
0.118
0.152
0.177
0.218
0.243
0.277
0.410
0.477

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