SECTION 1 5-EC Trip Device
Type EC overcurrent trip devices are magnetically
operated, using a series coil or single conductor, and an
associated magnetic structure to provide tripping force.
There are three basic characteristics: long time delay,
short time delay and instantaneous, which can be used in
various combinations to suit the application.
AKR breakers with EC Trips are for use on DC system
voltages. One EC trip device is mounted per breaker pole.
This device contains its functional adjustments.
FIG. 1 1 9 - EC-2A TRIP DEVICE
The standard EC trip device for breaker frames up to
2000 amps is the type EC-2A, see Fig. 1 1 9. An optional trip
device for these frames is the type EC-1 , see Fig. 1 20.
Trip characteristics are for the EC devices are g iven in
Table 1 7.
The time-current characteristics for the EC trip devices
are g iven in the fol lowing curves:
G ES-6000 EC-1
G ES-601 0 EC-2/2A 1 A-3
G ES-601 1 EC-2/2A 1 B-3
GES-6012 EC-2/2A 1 C-3
FIG. 1 20 - EC-1 TRIP DEVICE
TABLE 17 EC DEVICE TRIP CHARACTERISTICS
Long
Time
Short
Time
lnatantlineoue
Trip
Device
Pickup
CD
De
l
a
y
®
Pickup
Delay
<!l
Pickup
( 1 A) MAX.-adj. 1 5-38
sec.
4-9X,
or
80·1 60% X
( 1 8) INTER.-
ad
j
.
7 5- 1 8
sec.
6-12X,
EC-2A
( ± 1 0%)
or
9-15X or
( 1 C) MIN.-adj. 3 3-8.2
sec.
80-250%X
@)
( 1 A) MAX.-30
sec.
(2A) MAX.-.23
sec.
or
2-5X,
or
80·1 60% X
( 1 8) INTER.-1 5
sec.
3-7X
or
(28) INTER.-. 1 5 sec.
High Set
EC-1
( ± 1 0%)
or
4-1 0X
or
up
to 1 5X,
( 1 C) MIN.-5
sec.
(2C) MIN.-.07
sec.
Non-Adjustable
(2AA) MAX.-.20
sec.
( 1 88) MAX.-4.5
sec.
2·5X,
or
4·9X,
80-160% X
or
3-7X
or
(288) INTER.-.1 3
sec.
6·12X,
EC- 1 8
( ± 1 5%)
(1 CC) MIN.-2
sec.
4-1 0X
or
9-15X or
(2CC) MIN.-.07
sec.
80-250% X
@)
1 X =
Trip device ampere rating. If trip devices are set above
1 00%
for coordination purposes, such sett1ngs do not 1ncrease
the breaker's continuous current rat1ng.
2
At lower limit of band at
6
times pickup setting.
3
At lower limit of band at
2112
times pickup setting.
4
Low-set instantaneous. Not available in combination with long time delay.
84
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