Dimension drawings
(dimensions in mm):
Fig. I
Permissible installed positions:
Fig. II
Do not subject to sudden shocks or long-term vibrations.
Snap-on mounting on a standard EN 50 023 rail (75 mm) , or bolting on a
plane surface by four bolts to be secured by washers and spring washers.
Permissible cable cross-sections for phase conductors:I
Permissible cable cross-sections for phase conductors:
For position of connection terminals:
Fig. III
Connection of the main conductors:
Fig. IV
Equipment circuit diagram:
Fig. V
In the case of several single-phase loads, the three main circuits must be
connected in series.
Instructions:
Fig. VI
¿
Set the scale to the rated current of load.
À
Reset button (blue)
Push this button before commissioning and after tripping to make relay
ready for operation. In the as-delivered condition, the auxiliary contact
is set to H = Manual resetting. To change from H = Manual to A = Auto-
matic, press and turn the button counter-clockwise from H to A.
Á
Test button (red)
When this button is actuated, the NC contact opens and the NO contact
closes.
In the „Manual“ position, the relay is reset when the blue button is
pressed.
In the „Automatic“ position, the relay is reset automatically when the
red button is released.
Â
TRIPPED indication (green)
In the H setting, a green pin protrudes from the front plate to indicate
the TRIPPED condition. In the A setting, this condition is not indicated.
Separate installation of the relay, see Catalog.
Tripping characteristics:
Fig. VIII
The characteristics conform to VDE 0165, VDE 0170/0171 for machines with
type of protection E Ex e. Tripping times are shown for a three-phase load
from the cold state (ambient tempe20 °C).
Installation
Connection
3UA66
3UA68
... 200 A
... 400 A
... 500 A
... 630 A
Mounting on
contactors
a) 3TB54, 3TF54/55
b) 3TB56, 3TF56
3TB56
3TF56/57
3TB58
3TF68
Round con-
ductor with
cable lug
mm
2
ref. a) 35 to185
(...170 A)
ref. b) 35 to 240
50 to 240
2 x 70 to
2 x 240
2 x 95 to
2 x 240
Flat bar
mm
2
20 x 3
2 x 30 x 5
2 x 40 x 5
Terminal
screws
M8
M10
Tightening
torque
Nm
lb
.
in
10 to 14
89 to 124
14 to 24
124 to 210
Solid
mm
2
2 x (0.5 to 1); 2 x (1 to 2,5)
Finely stranded with end sleeve
mm
2
2 x (0.5 to 1); 2 x (0.75 to 2,5)
AWG conductors
2 x 18 to 12
Tightening torque
Ncm
lb
.
in
0.8 to 1.4
7 to 12
Commissioning
WARNING:
HAZARDOUS VOLTAGE
CAN CAUSE ELECTRICAL SHOCK
AND BURNS.
DISCONNECT POWER BEFORE PROCEEDING
WITH ANY WORK ON THIS EQUIPMENT.
In the case of hot relays, preloaded with 1 x I
E
, the tripping times decrease
by approx. 25 %.
I
E
Current setting
t
A
Tripping time in seconds (+ 20 %)
¿
Setting range (u = minimum setting, o = maximum setting)
À
Type designation/Order No.
Á
PTB (Federal testing Laboratories) Test Report No.
Permissible ambient air temperature
-25 °C to +55 °C
Degree of protection
IP 00 (IEC 60529)
Main circuit
Rated insulation voltage
1000 V
Rated operational current
3UA66
80 to 400 A
3UA68
320 to 630 A
Short-circuit protection
see nameplate
Table
Fig. VIII
¿
Setting range (A = Ampere; u = minimum, o = maximum setting range)
À
Max. response current of the line-side circuit-breakers
Á
Commissioning:
Set scale so that the ratio corresponds to the rated load current.
Example:
Rated load current
= 188 A
Max. setting
= 250 A
Ratio
= 188:250
= 0.75
Auxiliary circuit
Rated insulation voltage:
Rated operational currents:
Short-circuit protection:
NH, NEOZED or DIAZED fuses
6 A gG or 10 A, fast
Miniature circuit-breaker
3 A (C-characteristic)
Continuous thermal current I
th
6A
Operating conditions at ambient temperatures > 55 °C
At ambient temperatures > 55 °C, you must
1. Reduce the current loading for the overload relay
2. Upwardly correct the setting current to prevent tripping at motor rated
current.
Correction factors:
Example:
Motor rated current: 100 A
Ambient temperature: 70 °C
Overload relay fitted: 80 to 125 A
1st Step: Determine the permissible current loading:
Max. current loading: 125 A x 0.82 = 102.5 A
Loading with motor rated current 100 A at 70 °C ambient temperature is
permissible.
2nd Step: Calculate the setting current:
Motor rated current: 100 A
Setting current correction: 100 A x 1.1 = 110 A
You must set the overload relay to 110 A.
For further information and accessories, see Catalog.
Technical data
400 V,
differing potential
45277.1
690 V,
same potential
45277.2
AC-15/U
e
V
24
60
125
230
400
500
690
AC-15/I
e
A
2
1.5
1.25
1.15
1.1
1
0.8
DC-13/U
e
V
24
60
110
220
DC-13/I
e
A
2
0.5
0.3
0.2
Ambient
temperature
Perm. current loading referred
to end-of-scale value
Setting current
correction
55 °C
1
1
60 °C
0.94
1.08
65 °C
0.88
1.09
70 °C
0.82
1.1
2
Overload Relay with Transformer
3UA66, 3UA68
DIN VDE 0660, IEC 60947
Instructions
Order No.: 3ZX1012-0UA66-1AA1
English
