GE AKR-30 Series Maintenance Manual page 70

SECTION 1 3-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
voltages. One EC trip device is mounted per breaker pole.
This device contains its functional adjustments.
EC-2A TRIP DEVICE
FIG. 97
Trip
Device
Pickup (!)
80- 1 60">. X
EC-2A
I · t o--. )
80- 1 60">. X
EC- t ( "' t o--. )
I
80- 1 60"<. X
EC- I B I ' I S')
1 X rat•ng If tnp devlcea
=
At 6 llmes pockup Mft•ng
band
Tnp devoce ampere
3 At lower at 2'"1
band llmes
2 lower hm•t of at
Not avaolabll
onstantaneous hm•t of
4 Low-set
70
DC
system
TABLE 1 5 EC DEVICE TRIP CHARACTERISTICS
l.oftg Time
( l A} MAX --- l !t-38 MC
Ot
1 1 81 INTER --.c21 7 !t- 1 8 Me
Ot
I I C I M I N ---- 3 3-8 2 MC
A I MAX -30 MC
( I
Ot
l l!l 1 INTER - I S MC
Ot
I I C I MIN -S MC
I I B8 t lotAX � S MC
Ot
II CCI MIN -2 MC
Ml aoo- -. I 00"'. lot c:oord>na bOtl PVPOeM
are
10nQ lime Olley
pod<up Mft>ng lt'l comoonat iO" -
The standard EC trip device for breaker frames up
amps is the type EC-2A, see Fig. 97. An optional tr.,
2000
device for these frames is the type EC-1 , see Fig.
Trip characteristics are for the EC devices are given in
Table 15.
The time-current characteristics for the EC trip devices
are given in the following curves:
GESOOO O EC-1
GES00 1 0 EC-2/2A 1A-3
GES00 1 1 EC-2/2A 1 8-3
GES00 1 2 EC-2/2A 1 C-3
98
FIG. EC·, TRIP DEVICE
Shott Time
12AI MAX -.23 MC
2-5X.
Ot
).7X Ot 1281
INTER
6- I OX
Ot
(2C) MIN - 07 MC
12AA I MAX -.20 MC
).7X 2·SX. Ot (288 ) INTER-.13 MC Ot
6- I OX
(2CC ) MIN - 07 MC Ot
aen.ng. do nol mcr.ue the brlaker · a
IUCfl
ln.wrtll neou e
'- II X.
� 1 2X. 0t
II- 1 5X
80-250%)(
- 15 MC High Set
up 110 1 5X.
Non-Adtut�
'- II X.
.
�12)(, 0t
II- 1 5X
80-250'!1. X
continuous c:u�nt
'
98.
®
@
rebng