3UA Overload Relays

Description
3UA Series Overload Relays are suitable for overload and phase - failure protection of AC motors with frequency of 50/60Hz, voltage up to 690 ~
1000V, current up to 0.1 ~ 400A under 8 - hours duty or uninterrupted duty. The relays are also suitable for overload protection of DC magnet
and DC motors.
The relays comply with IEC947-4, VDE0660 and GB14048. Several functions provided by these relays are: phase-failure protection, temperature
compensation, ON/OFF indication and manual/automatic reset. The relays can be mounted onto contactors or installed as single units.

Operating Conditions
The altitude of the site of installation does not exceed 2000 meters above sea levels.
The ambient air temperature: -25 ~ +55C
Relative humidity does not exceed 90% at +25C

Features
3UA series are bimetal thermal relays with release class 10A.
With differential phase- failure protection
With continuous current adjusting scale
With temperature compensation
With ON/OFF indicator
With TEST(OFF) button
With Manual/Auto reset button
With Auxiliary contacts 1 NO +1 NC insulated each other
SIGUT - Siemens patent terminal, ensures easy and reliable connection, strong shock resistance and perfect safety protection.
Mounting: plug in connection with contactor or install as a single unit.

Selection and ordering data

3UA50

Order No.

Setting range
(A)

Fuse links
(A)
IEC947 - 4
1

For contactor

3TF30
3TF31
3TF40
3TF41
3TD401)
3TD401)
3TE40
3TB40
3TB41

3
Weight
kg

3UA50 40 - 0A
3UA50 40 - 0C
3UA50 40 - 0E

0.1 - 0.16
0.16 - 0.25
0.25 - 0.4

35
35
35

0.5
1
1.6

3UA50 40 - 0G
3UA50 40 - 0J

0.4 - 0.63
0.63 - 1

35
35

2
4

3UA50 40 - 0K
3UA50 40 - 1A
3UA50 40 - 1B

0.8 - 1.25
1 - 1.6
1.25 - 2

35
35
35

4
6
6

3UA50 40 - 1C
3UA50 40 - 1D
3UA50 40 - 1E

1.6 - 2.5
2 - 3.2
2.5 - 4

35
35
35

6
10
10

0.14

3UA50 40 - 1F
3UA50 40 - 1G
3UA50 40 - 1H

3.2 - 5
4 - 6.3
5-8

35
35
35

16
16
20

0.14

3UA50 40 - 1J
3UA50 40 - 1K
3UA50 40 - 2S

6.3 - 10
8 - 12.5
10 - 14.5

35
35
35

25
25
25

0.14

0.14

0.14
0.14

1) lnstalling as a single unit with individual wiring only.

2) use 3UX1210 links for connection to 3TF53 contactors.
3/1

3UA Overload Relays

Selection and ordering data
3UA52

3UA54

Order No.

Setting range
(A)

For contactor

3TF32
3TF33
3TF42
3TF43
3TD421)
3TD431)
3TE42
3TB42
3TB43

Weight
kg

3UA52 40 - 0A
3UA52 40 - 0C
3UA52 40 - 0E

0.1 - 0.16
0.16 - 0.25
0.25 - 0.4

63
63
63

0.5
1
1.6

3UA52 40 - 0G
3UA52 40 - 0J
3UA52 40 - 0K

0.4 - 0.63
0.63 - 1
0.8 - 1.25

63
63
63

2
4
4

3UA52 40 - 1A
3UA52 40 - 1B
3UA52 40 - 1C

1 - 1.6
1.25 - 2
1.6 - 2.5

63
63
63

6
6
6

3UA52 40 - 1D
3UA52 40 - 1E
3UA52 40 - 1F

2 - 3.2
2.5 - 4
3.2 - 5

63
63
63

10
10
16

0.14

3UA52 40 - 1G
3UA52 40 - 1H
3UA52 40 - 1J

4 - 6.3
5-8
6.3 - 10

63
63
63

16
20
25

0.14

3UA52 40 - 1K
3UA52 40 - 2A
3UA52 40 - 2B
3UA52 40 - 2C

8 - 12.5
10 - 16
12.5 - 20
16 - 25

63
63
63
63

25
35
35
50

Order No.

Setting range
(A)

Fuse links
(A)
IEC947 - 4
1

3UA54 40 - 1G
3UA54 40 - 1J
3UA54 40 - 2A

4 - 6.3
6.3 - 10
10 - 16

100
100
100

16
25
35

3UA54 40 - 2B
3UA54 40 - 2C
3UA54 40 - 2D
3UA54 40 - 2Q

12.5 - 20
16 - 25
20 - 32
25 - 36

100
100
100
100

50
50
80
80

) Installing as a single unit with individual wiring only

3/2

Fuse links
(A)
IEC947 - 4

0.14

0.14

0.14

0.14

For contactor

3TB44

Weight
kg

0.20

0.20

3UA Overload Relays

Selection and ordering data
3UA55

3UA58

Order No.

For contactor

3UA55 40 - 1A
3UA55 40 - 1B
3UA55 40 - 1C

1 - 1.6
1.25 - 2
1.6 - 2.5

1
100
100
100

3UA55 40 - 1D
3UA55 40 - 1E
3UA55 40 - 1F

2 - 3.2
2.5 - 4
3.2 - 5

100
100
100

10
10
16

3TF45
3TD441)
3TD451)

3UA55 40 - 1G
3UA55 40 - 1H
3UA55 40 - 1J

4 - 6.3
5-8
6.3 - 10

100
100
100

16
20
25

3TE44

3UA55 40 - 1K
3UA55 40 - 2A
3UA55 40 - 2B
3UA55 40 - 2C
3UA55 40 - 2D
3UA55 40 - 2Q
3UA55 40 - 2R
3UA55 40 - 8M

8 - 12.5
10 - 16
12.5 - 20
16 - 25
20 - 32
25 - 36
32 - 40
36 - 45

Order No.

Setting range
(A)

100
25
100
35
100
50
100
50
100
80
100
80
100
80
100
80
Fuse links
(A)
IEC947 - 4

Weight
kg

2
6
6
6

3TF34
3TF35
3TF44

0.20

0.20

3UA58 40 - 2E
3UA58 40 - 2F
3UA58 40 - 2T

12.5 - 20
16 - 25
20 - 32
25 - 40
32 - 50
40 - 57

1
160
160
160
160
160
160

2
50
50
63
80
100
100

3UA58 40 - 2P
3UA58 40 - 2V
3UA58 40 - 2U
3UA58 40 - 8W

50 - 63
57 - 70
63 - 80
70 - 88

160
160
250
250

100
125
160
160

3UA58 40 - 2B
3UA58 40 - 2C
3UA58 40 - 2D

Setting range
(A)

Fuse links
(A)
IEC947 - 4

0.20

0.20

0.20
0.20
For contactor

Weight
kg

3TF46
3TF47
3TF48
3TF49
3TD461)
3TD471)
3TD481)
3TE46
3TE47
3TE48

0.4

0.4

0.4

) Installing as a single unit with individual wiring only

3/3

3UA Overload Relays

Selection and ordering data
3UA60

3UA61

3UA59

Order No.

1
250
250
315

2
160
160
200

For contactor

Weight
kg

3UA60 40 - 2H
3UA60 40 - 2W
3UA60 40 - 2X

55 - 80
63 - 90
80 - 110

3UA60 40 - 3H
3UA60 40 - 3J

90 - 120
110 - 135

Order No.

Setting range
(A)

3UA61 40 - 2H
3UA61 40 - 2W
3UA61 40 - 2X

55 - 80
63 - 90
80 - 110

3UA61 40 - 3H
3UA61 40 - 3J
3UA61 40 - 3K

90 - 120
110 - 135
120 - 150

Order No.

Setting range
(A)

3UA59 40 - 0A
3UA59 40 - 0C
3UA59 40 - 0E

0.1 - 0.16
0.16 - 0.25
0.25 - 0.4

1
25
25
25

2
0.5
1
1.6

3UA59 40 - 0G
3UA59 40 - 0J
3UA59 40 - 0K

0.4 - 0.63
0.63 - 1
0.8 - 1.25

25
25
25

2
4
4

3UA59 40 - 1A
3UA59 40 - 1B
3UA59 40 - 1C

3UA59 40 - 1G
3UA59 40 - 1H
3UA59 40 - 1J

1 - 1.6
1.25 - 2
1.6 - 2.5
2 - 3.2
2.5 - 4
3.2 - 5
4 - 6.3
5-8
6.3 - 10

25
25
25
25
25
25
25
25
25

6
6
6
10
10
16
16
16
16

3UA59 40 - 1K
3UA59 40 - 2A
3UA59 40 - 2B

8 - 12.5
10 - 16
12.5 - 20

35
63
63

25
35
50

0.28

3UA59 40 - 2C
3UA59 40 - 2D
3UA59 40 - 2E

16 - 25
20 - 32
25 - 40

63
80
125

50
63
80

0.28

3UA59 40 - 2M
3UA59 40 - 2T
3UA59 40 - 2P

32 - 45
40 - 57
50 - 63

160
160
160

100
125
125

0.28

3UA59 40 - 1D
3UA59 40 - 1E
3UA59 40 - 1F

3/4

Setting range
(A)

Fuse links
(A)
IEC947 - 4

315 224
315 224
Fuse links
(A)
IEC947 - 4
1
250
250
315

2
160
160
200

315 224
315 224
315 224
Fuse links
(A)
IEC947 - 4

3TE481)
3TF491)
3TF50
3TE50
3TD501)
3TB50
For contactor
3TF51

0.7
0.7
Weight
kg
0.7

0.7
For contactor
mounting seperatly

Weight
kg
0.28

0.28

0.28

0.28

0.28

3UA Overload Relays

Selection and ordering data
3UA62

3UA66

Accessories

1
2

Order No.

Setting range
(A)

3UA62 40 - 2H
3UA62 40 - 2W
3UA62 40 - 2X
3UA62 40 - 3H
3UA62 40 - 3J
3UA62 40 - 3K
3UA62 40 - 3L
3UA62 40 - 3M

55 - 80
63 - 90
80 - 110
90 - 120
110 - 135
120 - 150
135 - 160
150 - 180

Order No.

Setting range
(A)

3UA66 40 - 2K
3UA66 40 - 3B
3UA66 40 - 3C
3UA66 40 - 3D
3UA66 40 - 3E

80 - 125
125 - 200
160 - 250
200 - 320
250 - 400

Fuse links
(A)
IEC947 - 4
1 2
250 160
250 160
315 200
315 224
315 224
315 224
355 224
355 224
Fuse links
(A)
IEC947 - 4
1 2
500 250
500 315
500 400
500 400
800 500

For contactor
3TF52
3TE52
3TD521)
3TF532)
3TB52

Weight
kg
0.7
0.7
0.7

For contactor

Weight
kg
2.5

2.5

Name

Order No.

Application

Weight
kg

Cable release

3UX1015
3UX1016

3UX1015 400mm long

3UX1016 600mm long
For resetting relays at a long distance

0.07

Relay base

3UX1418

For installing 3UA50 as a single unit

0.05

Relay base

3UX1420

For installing 3UA52, 3UA54 as a single unit

0.05

Relay base

3UX1421

For installing 3UA58 as a single unit

0.05

Relay base

3UX1425

For installing 3UA55 as a single unit

Box terminal block

3UX1424

For installing 3UA60 as a single unit

0.05

0.2

) Installing as a single unit with individual wiring only

) Use 3UX1210 links for connection to 3TF53 contactors
3/5

3UA Overload Relays

Technical data
3UA50 3UA52 3UA54 3UA55
14.5 25
36 45

Rated operational current(A)

Rated insulation voltage(V)

690
690

Rated operational voltage(V)

690
690

Type of current, frequency

3UA58
88

3UA60
135

3UA61
150

3UA62
180

3UA66
400

1000
1000

1000
1000

1000
1000

1000
1000
AC 50 to 400Hz

690
1000
690
1000
DC; AC up to 400Hz

-25~+55 -25~+55 -25~+55 -25~+55 -25~+55 -25~+55 -25~+55 -25~+55

Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
1NO+1NC 1NO+1NC 1NO+1NC 1NO+1NC 1NO+1NC 1NO+1NC 1NO+1NC 1NO+1NC
1.1A
1.1A
1.1A
1.1A
1.1A
1.1A
1.1A
1.1A
Plug - in
Plug - in as a single unit Plug - in as a single unit as a single unit as a single unit as a single unit

Ambient temperature(C)
Phase - failure protection
Manual/Auto reset
Temperature compensation
(-25~+55C)
Switch position indicator
Test button
Terminal for contactor coil
Auxiliary contacts
Switching capacity(380V) AC - 15
Mounting

Main
Conduc- circuit
tor
crosssection
(mm2)

3UA59
63

Solid or stranded
conductor

2.5~6

1.5~25

1.5~25

2.5~35

25~70

50~120

50~120

Finely stranded
conductor with
end sleeve

1.5~4

1~16

1~16

1.5~25

25~50

25~95
20 3
Flat bars

25~95
20 3
Flat bars

200A 185
> 200A 240
20 3/
2 30 5
Flat bars

Terminal screw

M4

M5

M5

M5

M6

M8

M8

M8/M10

2
(0.5~1)

2
(0.5~1)

2
(0.5~1)

2
(0.5~1)

2
(0.5~1)

2
(0.5~1)

2
(0.5~1)

2
(0.5~1)

2
(0.5~1)

2
(0.5~1)

2
(0.5~1)

2
(0.5~1)

2
(0.5~1)

2
(0.5~1)

2
(0.5~1)

2
(0.5~1)

M3.5

M3.5

M3.5

M3.5

M3.5

M3.5

M3.5

M3.5

Single core or
stranded conductor
Finely stranded
Auxiliary conductor with
end sleeve
circuit
Terminal screw

Protection characteristics
Item No.

Times the setting current

Release time

Test condition

1
2

1.05
1.20

>2h 1)

Cold state

3
4

<2h 1)

Hot state
pre - heated for 2 hours with 1 time
<2min 1)
1.50
setting current
7.2
2s<Tp 10s, Class 10A
Cold state
Hot state means heat the overload relay into steady state with the current as shown in Item 1.
Times the setting current

Item No.

Any two phases

Another phase

Release time

Test condition

1.0

0.9

>2h 2)

Cold state

1.15

<2h 2)
Hot state means heat the overload relay into steady state with the current as shown in Item 1.

) Release time with 3-pole symmetrical load at ambient termperature +20C

) Release time with 3-pole unsymmetrical load (phase-failure) at ambient termperature +20C
3/6
1

Hot state

3UA Overload Relays

Technical data

3.Release time with 3-pole symmetrical load form the cold state (as reference)
Setting range
Conductor
(A)
corss-sections
(mm2)
3
4
3UA50, 3UA52
0.1-0.16
0.16-0.25
0.25-0.4
0.4-0.63
0.63-1
0.8-1.25
1-1.6
1.25-2
1.6-2.5
2-3.2
2.5-4
3.2-5
4-6.3
5-8
6.3-10
8-12.5
10-14.5
10-16
12.5-20
16-25
3UA54
4-6.3
6.3-10
10-16
12.5-20
16-25
20-32
25-36
3UA55
1-1.6
1.25-2
1.6-2.5
2-3.2
2.5-4
3.2-5
4-6.3
5-8
6.3-10
8-12.5
10-16
12.5-20
16-25
20-32
25-36
32-40
36-45

Times the setting current

5

1
1
1
1
1
1
1
1
1
1
1
1
1
1
1.5
2.5
2.5
2.5
2.5
4

16.7
20.5
18
20.8
23.3
28
22.6
22.3
24.5
23.8
24.4
27.5
23.4
22.5
24
24.5
23.2
23.2
23
31

10.3
12.8
11.2
12.8
14.4
17.5
14.3
14
15.5
15
15.6
17
14.4
13.5
13.9
14.8
13.9
13.9
13
17

7.5
9.5
8.2
9.5
10.5
12.7
10.4
10.3
11.5
11
11.4
12.2
10.4
9.5
9.3
10.2
9.5
9.5
8.6
11

1
1.5
2.5
2.5
4
6
10

23.4
24
26.2
26.6
29
28
33.4

14.4
13.9
15.8
14.8
15.4
16.1
19

10.4
9.3
10.8
9.7
9.8
10.8
12.8

1
1
1
1
1
1
1
1
1.5
2.5
2.5
2.5
4
6
10
10
10

22.6
22.3
24.5
23.8
24.4
27.5
25.4
22.5
24
24.5
26.2
26.6
29
28
33.4
24.3
23

14.3
14
15.5
15
15.5
17
14.4
13.5
13.9
14.8
15.8
14.8
15.4
16.1
19
13.6
13

10.4
10.3
11.5
11
11.4
12.2
10.4
9.5
9.3
10.2
10.8
9.7
9.8
10.8
12.8
8.8
8.5

Release time: (in sec.)

5.9
4.8
7.5
6.3
6.5
5.4
7.6
6.3
8.3
6.8
9.8
8.1
8.3
6.8
8.4
6.9
9
7.5
8.8
7.3
9.1
7.6
9.5
7.8
8
6.5
7.2
5.7
6.8
5.3
7.8
6.2
7.2
5.6
7.2
5.6
6.3
4.8
7.7
5.8
Release time: (in sec.)
8
6.5
6.8
5.3
8.1
6.4
7.0
5.3
7.0
5.3
8.2
6.3
9.3
7.2
Release time: (in sec.)
8.3
6.8
8.4
6.9
9
7.5
8.3
7.3
9.1
7.6
9.5
7.8
8
6.5
7.2
5.7
6.8
5.3
7.8
6.2
8.1
6.4
7
5.3
7
15.3
8.2
6.3
9.3
7.2
6.6
5
6.2
4.5

8
4.1
5.4
4.6
5.4
5.8
6.8
5.9
6.0
6.4
6.3
6.5
6.5
5.5
4.7
4.3
5.2
4.6
4.6
3.9
4.6

5.5
4.3
5.2
4.3
4.2
5.2
5.8
5.9
6
6.4
6.3
6.5
6.5
5.5
4.7
4.3
5.2
5.2
4.3
4.2
5.2
5.8
4.2
3.3

3/7

3UA Overload Relays

Technical data
Setting range
(A)

3UA58
16-25
20-32
25-40
32-50
40-57
50-63
57-70
63-80
70-88
3UA59
0.1-0.16
0.16-0.25
0.25-0.4
0.4-0.63
0.63-1
0.8-1.25
1-1.6
1.25-2
1.6-2.5
2-3.2
2.5-4
3.2-5
4-6.3
5-8
6.3-10
8-12.5
10-16
12.5-20
16-25
20-32
25-40
32-45
40-57
50-63
3UA60, 3UA61, 3UA62
55-80
63-90
80-110
90-120
110-135
120-150
135-160
150-180
3UA66
80-125
125-200
160-250
200-320
250-400

3/8

Conductor
corss-sections

Times the setting current

(mm2)

4
6
10
10
16
16
25
25
35

34
33
30
29
35
37
40
40
33.9

19.5
18.5
17
16.6
19.4
20.5
21.5
21.5
17.6

1
1
1
1
1
1
1
1
1
1
1
1
1
1
1.5
2.5
2.5
2.5
4
6
10
10
16
16

16.7
20.5
18
20.8
23.3
28
22.6
22.3
24.5
23.8
24.4
27.5
23.4
22.5
24
31
16.1
17.3
16.7
17.5
17.3
16.7
17.5
17

10.3
12.8
11.2
12.8
14.4
17.5
14.3
14
15.5
15
15.6
17
14.4
13.5
13.9
17
9.5
10.1
9.8
10
10.1
9.8
10
9.7

25
35
35
50
50
50
70
95

36
44
43
40
32
35
38
37

21
24
22
21.8
18
19.5
20.6
20.5

50
95
120
185
240

25
24.4
23.8
25.6
25

16.8
16.1
13.9
15.5
15

5
6
Release time: (in sec.)
13.2
9.7
12.8
9.4
11.5
8.4
11
8
12.3
8.7
13.3
9.6
14
9.8
13.8
9.7
11.8
8
Release time: (in sec.)
7.5
5.9
9.5
7.5
8.2
6.5
9.5
7.6
10.5
8.3
12.7
9.8
10.4
8.3
10.3
8.4
11.5
9
11
8.8
11.4
9.1
12.2
9.5
10.4
8
9.5
7.2
9.3
6.8
11
7.7
6.6
5.1
7
5.2
6.7
5.1
6.8
5.1
7
5.2
6.7
5.1
6.8
5.1
6.7
5.1
Release time: (in sec.)
13.5
9.8
15.5
11
14
10
14
10
11.7
8.4
12.8
9.4
13.8
10
13.5
9.7
Release time: (in sec.)
13.1
11.1
11.9
9.8
10.3
8.5
10.9
8.5
10.5
8.5

7.6
7.4
6.5
6.2
6.6
7.3
7.4
7.3
6.5

6.2
6
5.3
5
5.3
5.8
5.8
5.8
4.9

4.8
6.3
5.4
6.3
6.8
8.1
6.8
6.9
7.5
7.3
7.6
7.8
6.5
5.7
5.3
5.8
3.9
4.2
3.9
4
4.2
3.9
4
4

4.1
5.4
4.6
5.4
5.8
6.8
5.9
6.0
6.4
6.3
6.5
6.5
5.5
4.7
4.3
4.6
3.3
3.4
3.2
3.3
3.4
3.2
3.3
3.3

7.5
8.5
7.7
7.5
6.4
7.2
7.6
7.4

6.1
6.7
6.1
5.9
5.1
5.8
6.2
6.0

9.9
8.4
7.3
7
7

9.1
7.4
6.5
6.4
6.2

3UA Overload Relays

Tripping characteristics
The current-time curves show the relationship
between the tripping time from cold state and
multiples of the set current E. When the relay
is at operating temperature and carrying 1.0 x
E, the tripping times are reduced to approximately 25%. Tripping curve 3 is applicable to
3-pole loads and curve 2 to 2-pole loads. For
single-pole loads the tripping curves lie
between curves 2 and 3. For normal
operation, all 3 bimetallic strips of the
overload relay must be heated, The overload
relays 3UA are suitable for protecting motors
with phase control. For protecting singlephase or DC-loads, therefore, all three main
conducting paths must be connected in
series.
Tripping curve 3 is then applicable.
The release current with a 3-pole symmetrical
load is between 105% and 120% of the set
current.

Tripping current (average)

Fig. 3/19 Typical tripping characteristics

3/9

3UA Overload Relays

Internal connection diagrams
Reset button

3UA50, 3UA52, 3UA54, 3UA55

Reset button

OFF button
3UA58, 3UA59, 3UA60, 3UA61, 3UA62

OFF button

Current transformer
Tripping relay

Reset button

3UA66, 3UA68

Connection leads
Cu 4 mm2, 4 m long

OFF button

3UA66, 3UA68 separate mounting of current transformer and release

relay

Technical date of auxiliary contacts

1. Conventional thermal current (at 35C) th=6A
2. Rated insulation voltage Ui

Unequal potential (NO+NC)

400V

Equal potential (NO+NC connected as

changeover contact)
690V

3. Switching capacity
AC-15
Ue
(V)
24
60
125
230
400
500
690

3/10

DC-13
e

(A)
2
1.5
1.25
1.15
1.1
1
0.8

Ue
(V)

(A)

24
60
110
220

2
0.5
0.3
0.2

3UA Overload Relays

Specification of installation
1. Marks on panel of 3UA.

Panel of 3UA50 3UA52 3UA54 3UA55

Panel of 3UA58 3UA59 3AU60 3UA61 3UA62 3UA66

Terminal for contactor coil A2.

Setting current adjusting scale
Reset button (blue)
H-manual
A-automatic
Switch position indicator (green)
Tripping of a manual-resetting relay is indicated by a pin projecting from the front-plate.
Test button (red)
Auxiliary contact terminals shown in 95.96.97.98.NC contacts and NO contacts are shown in positions 95.96 and 97.98 respectively.
Main circuit connection terminal No. It must correspond with terminal No. of contactor.
In case of separate mounting of 3UA6, the set current must be set on the scale against the reference mark.

2. Set the scale to the rated current of the load.

3. If the reset button points to H (manual) and the relay has been tripped, pressing the button puts the relay in operation again.
With the door of panel closed, manual reset can be performed by means of the cable release which can be ordered (see accessories in detail).
Changing to automatic reset by pressing and turning the button anti-clock wise from H to A.
4. When the test button is actuated, the NC contact opens and the NO contact closes, therefore the auxililary circuit (simulation of overload
tripping) can be tested.
In the manual position, the relay is resetted when the blue reset button is pressed. In the Automatic postion, the relay is reset
automatically when the button is released.
5. Mounting and operating position, the relays are shown in drawings.

Overload relays with 3TF or 3TB contactors

Overload relay with 3UX14

terminal brackets as a single unit

tripping relay installed as a single unit

3/11

3UA Overload Relays

Dimension drawings

b1 b2 c1 c2
I 125 55 80 108
II 130 60 95 100
3UA50+3TF30/31 contactor

3UA50+3TF40/41 contactor.
( contactor with 1NO+ or 1NC aux. Contact.
contactor with 1NO+NC or 2NO+NC aux. contact)

3UA52+3TF32/33 contactor

3UA52+3TF42/43 3TB42/43 contactor.

3UA54+3TB44 contactor

3UA55+3TF34/35 contactor.

Note:

3/12

) The distance to earthed part.

) The distance to square OFF-button (stroke 3mm)
The distance to round RESET-button (stroke 2.5mm) less 2.5mm.
1) For 35mm standard mounting rail (DIN EN 50 022).

3UA Overload Relays

Dimension drawings
3UA55+3TF44/45 contactor
Note:

) The distance to earthed part.

) The distance to square OFF-button (stroke 3mm)
The distance to round RESET-button (stroke 2.5mm)less 2.5mm
1) For 35mm standard mounting rail (DIN EN 50 022).

3
Overload relays with terminal brackets
3UA50 with 3UX1 418
3UA52 with 3UX1 420
3UA54 with 3UX1 420

d
10
14.3
14.3

e
M4
M4
M4

f
M3.5
M4
M4

3UA50, 3UA52, 3UA54 relays with terminal bracket as a single unit.

3UA58+3UX1421 terminal bracket as a single unit.

3UA59 for installing as a single unit.

3/13

3UA Overload Relays

Dimension drawings

3UA58+
3TF46, 3TF47
3TF48, 3TF49
3TB46
3TB47, 3TB48

a1
90
100
90
100

a2
113
123
117
127

a3
70
80
70
80

b1
117
133
118
130

b2
175
194
176
192

b3
100
110
100
110

c1 d1 d2 d3
132 10.5 26.5 25
140 10.5 26.5 25
123 29
140 30
-

e
e1
f1
102 31.5 80
116 31.5 89
34 79
36 86

f2
63
71
61
68

f3
122
132
122
128

g
28
39
-

g g2
4.8 6.1
5.5 6.1
4.8 M5
5.8 M5/M6

3UA50+3TF46, 3TF48, 3TF49, 3TB46, 3TB47, 3TB48 (plug-in type)

3UA60 for mounting on to contactors or mounting as a single unit

with 3UX1424.

The distance to earthed part.

The distance to square OFF-button (stroke 3mm)
The distance to round RESET-button (stroke 2.5mm) less 2.5mm

3/14

3UA61 3UA62 for mounting on to contactors and for intalling as a

single unit

1) For 35mm standard mounting rail (DIN EN 50 022).

2) Height and spacing of the connection rails can accmodated to
3TF50/3TF52 contactors (not for 3UA61).

3UA Overload Relays

Dimension drawings

3TB50
3TF51
3TB52
3TF50
3TF52

a1
120
120
135
120
135

a2
147
143
162
143
158

a3
100
100
110
100
110

b1
150
150
180
150
180

b2
230
232
257
232
257

b3
130
130
160
130
160

c1
150
150
185
150
185

d1
37
20
42
15
20

d2
15
42
20
37
42

d3
37
37
42

e
133
139
154
130
154

e1
213
215.5
234
213
234

e2
43
40.5
38
40
40

f1
90
93
115
93
115

f2
89
80
93
80
93

f3
149
146
153
146
153

g
7
6.3
7
6.3
7

g
M6
M8
M8
6.6
M8

g
45
45
48

3UA60, 3UA61, 3UA62+3TB50/52, 3TF50/51/52 Contactors.

For installing as a single unit

Type
3UA66 40-2K-3B
3UA66 40-3C,-3D,-3E

a
46
50

b
140
140

c
69
70

d
9
11

e
160
171

f
20 3
25 4

The distance to earthed part

The distance to square OFF-button (stroke 3mm). The distance to round RESET-button (stroke 2.5mm) less 2.5mm.
1) Box terminals only for 3TF50
2) For 75mm standard mounting rail to DIN EN 50023

3/15