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Overload Relay with Phase-Failure Sensitivity
Instructions
! Limited protection against contact with live parts.
Degree of protection IP 20 to IEC 60529.
Safe from finger touch to DIN VDE 0106,Part 100.
Commissioning and maintenance by qualified personnel only.
Follow the operating Instructions!
！
Hazardous voltage can cause electrical
Disconnect power before proceeding with
any work on this equipment.
Fig. I 3UA50: For mounting on contactors 3TD40/41, 3TE40, 3TF30/31/40/41,
3TW10/12/40/41;
Individual mounting possible with assembly kit 3UX14 18.
3UA52: For mounting on contactors 3TD42/43, 3TE42, 3TF32/33/42/43,
3TW13/42/43;
Individual mounting possible with assembly kit 3UX14 20.
Installation
Dimension drawings (dimensions in mm): Fig. II
a 3UA50: for individual mounting with assembly kit 3UX14 18
3UA52: for individual mounting with assembly kit 3UX14 20
b 3UA50: for mounting on contactor 3TF30/31
c 3UA50: for mounting on contactor 3TF40/41
I=contactor with 1 NO or 1 NC
II=contactor with 1NO + 1NC or 2NO + 2NC
d 3UA52: for mounting in contactor 3TF32/33
e 3UA52: for mounting in contactor 3TF42/43
1)
Minimum distance from earthed components
2)
For snap-on mounting on a standard sectional rail to DIN EN 50022.
3)
Dimension for square OFF button (stoke 3mm).
4)
Dimension for round RESET button (stroke 2.5mm) dimension minus 2.5mm.
Permissible installed positions:
a Overload relay with contactor
b Overload relay for individual mounting
Do not subject to sudden shocks or long-term vibrations.
Mounting:
Snap-on mounting on a standard sectional rail (35mm) to EN 50 022 or bolting on a plane
surface by two bolts to be secured by washers and spring washers.
Connection
Equipment circuit diagram:
Permissible cable cross-sections:
In the case of several single-phase loads, the three main circuits must be connected in series.
Commissioning
Instructions:
① Set the scale to the rated current of load.
② 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=Automatic, press and turn the button counter-
clockwise from H to A.
③ Test button (red)
When this button is actuated, the NC contact opens and the NO contact closes, i.e.
a test function for NC and NO contacts (simulation of overload tripping).
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.
④ 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.
2
WARNING
shock and burns.
Fig. III
Fig. IV
Fig. V
Fig. VI
GB14048.4，DIN VDE0660，Part 102，IEC 60947-4-1
A001253
Order No.： 4NEB 601 1482-30 *5
⑤ Terminal for contactor coil, A2.
Tripping characteristics: Fig. VII
The characteristics conform to VDE0165, 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 temperature
℃
+20
). In the case of hot relays, preloaded with 1×I
approx. 25%.
I
Current setting
E
t
Tripping time in seconds (±20% )
A
① Setting range
(I= lowest value of current setting I
② Type designation/Order No.
③ PTB (Federal testing Laboratories) Test Report No.
Technical data
Main circuit
Rated insulation voltage
Rated operational current
Permissible ambient air temperature
Short-circuit protection
Auxiliary circuit
Rated operational currents
AC-15/Ue
AC-15/Ie
DC-13/Ue
DC-13/Ie
Rated insulation voltage:
400V
differing potential
Short-circuit protection:
NH, NEOZED or DIAZED fuses
Miniature circuit-breaker
Operating conditions at ambient temperatures>55
At ambient temperatures > 55
1. Reduce the current loading for the overload relay
2. Upwardly correct the setting current to prevent tripping at motor rated current.
Correction factors:
Ambient
temperature
℃
55
℃
60
℃
65
℃
70
Calculation example:
Motor rated current:
Ambient temperature:
Overload relay fitted:
1st Step: Determine the permissible current loading:
Max. Current loading: 12.5 A × 0.82 =10.25 A
Loading with motor rated current 10 A at 70
2nd Step: Calculate the setting current:
Motor rated current: 10 A
Setting current correction: 10 A × 1.1=11 A
You must set the overload relay to 11 A.
For further information and accessories, see Catalog.
Siemens Electrical Apparatus Ltd., Suzhou
3UA50，3UA52
Q/SMS 001，XK06-201 0023
II= highest value of current setting I
E,
690V
3UA50: 0.1~14.5 A
3UA52: 0.1~25 A
℃
℃
-25
to +55
see nameplate
V
24
60
125
230
A
2
1.5
1.25
1.15
V
24
60
110
220
A
2
0.5
0.3
0.2
690V
same potential
6A gG or 10A, fast
3A (C-characteristic)
, you must
℃
Perm. current loading referred
to end-of-scale value
1
0.94
0.88
0.82
10 A
70
℃
8~12.5 A
℃
ambient temperature is permissible.
English
, the tripping times decrease by
E
)
E
400
500
690
1.1
1
0.8
℃
Setting current
correction
1
1.08
1.09
1.1
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