EntelliGuard®TU Trip Unit
Section 1 – General Information 09/25/08
10 © 2008 General Electric All Rights Reserved
Table 3: Short Time Delay Slope Settings
Commit Time EntelliGuard G
Band TDB Setting
50 Hz 60 Hz Clear Time 60 Hz Clear Time 50 Hz
1 Min. 0.030 0.025 0.080 0.085
2 2nd 0.040 0.033 0.088 0.093
3 3rd 0.050 0.042 0.097 0.102
4 4th 0.060 0.058 0.113 0.118
5 5th 0.110 0.092 0.147 0.152
6 6th 0.130 0.117 0.172 0.177
7 7th 0.180 0.158 0.213 0.218
8 8th 0.210 0.183 0.238 0.243
9 9th 0.240 0.217 0.272 0.277
10 10th 0.280 0.350 0.405 0.410
11 Max. 0.340 0.417 0.472 0.477
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
ANSI (X In) UL (X In)
Frame
(A)
With ST W/O ST With ST W/O ST
800
15 10 15 10
1,600 15 10 15 10
2,000 15 10 15 10
2,500
- -
13 10
3,000
- -
13 10
3,200 13 10
- -
4000 9 9 9 9
5000 7 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.
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.
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