3UA Thermally Delayed Overload Relays

CLASS 10
Technical data according to IEC 947-4
Type 3UA70 11/ 3UA50/ 3UA55 3UA58 3UA59 3UA60 3UA61/ 3UA66 3UA68
3UA70 21 3UA52 3UA62
Trip class CLASS 10A (2 s < tA ≤10 s at 7.2 ×Ie from cold state and tA ≤2 min at 1.5 ×Ie from hot state)
Phase failure sensitivity by yes yes yes yes yes yes yes yes yes
differential phase shift
Changeover to automatic no yes yes yes yes yes yes yes yes
reset
RESET button with trip-free yes yes yes yes yes yes yes yes yes
feature
Temperature compensation yes yes yes yes yes yes yes yes yes
Switch position indicator yes yes yes yes yes yes yes yes yes
Test button actuates the NO yes yes yes yes yes yes yes yes yes
and NC contacts
Terminal for contactor coil no1) yes yes no1) no1) no1) no1) no1) no1)
Permissible ambient
temperature °C –25 to +552) –25 to +55
Degree of protection IP 00/open or IP 20 to IEC 947-1 and DIN 40 050
Shock resistance g/ms 8/10

Main circuit
Rated insulation AC/DC V 690 690 690 1000 690 1000 1000 1000 1000
voltage Ui
(pollution degree 3)
Rated impulse kV 6 6 6 8 6 8 8 8 8
withstand voltage Uimp
Type of current, DC; AC up to 400 Hz AC 50 to 400 Hz
frequency range
Conductor cross-sections Setting
range
(≤200 A/
>200 A)
Terminal screw M3 M4 M5 M5 M5 M6 M8 M 8/M 10 M 10
solid or stranded mm2 0.5 to 2.5 2.5 to 6 1.5 to 25 2.5 to 35 1.5 to 25 25 to 70 50 to 120 185/240 2 ×240
finely stranded with end mm2 0.5 to 1.5 1.5 to 4 1 to 16 1.5 to 25 1 to 16 25 to 50 25 to 95 – –
sleeve
Flat bars mm – – – – – – 2 0× 3 2 0× 3/ 2 ×30 ×5
2 ×30 ×5
Tightening torque Nm 0.4 to 0.7 1 to 1.5 2.5 to 3 2.5 to 3 2.5 to 3 6 to 8 10 to 14 10 to 14 14 to 24
lb. in 4 to 6.5 9 to 13 22 to 26.5 22 to 26.5 22 to 26.5 52 to 50 89 to 124 89 to 124/ 124 to 210
Nm 14 to 24
lb. in 124 to 210
Power loss per
conducting path (max.)
at lowest value W (VA) 0.6 0.9 1.2 2.6 0.8 5 5 4 ( 5) 6 ( 9)

at highest value W (VA) 2.3 2.25 3 4 2 7 7 10 (12) 15 (22)

of the setting range

1) Not required.
2) The upper setting Io is to be reduced by 0.5% per
1°C excess temperature or a min. space of
5 mm is to be maintained between the units when
several overload relays are series mounted and
simultaneously operated at ambient temperatures
exceeding 25 °C.
3UA Thermally Delayed Overload Relays
CLASS 10
Technical data according to IEC 947-4
Type 3UA70 11/ 3UA50/ 3UA55 3UA58 3UA59 3UA60 3UA61/ 3UA66 3UA68
3UA70 21 3UA52 3UA62

Auxiliary circuit
Auxiliary contacts 1 NO + 1 NC 1 NO + 1 NC 1 NO + 1 NC
Conductor cross-sections
Terminal screw M3 M 3.5
solid or stranded mm2 2×(0.5 to 2.5) 2 ×(0.5 to 1)/2× (1 to 2.5)
finely stranded with end mm2 2×(0.5 to 1.5) 2 ×(0.5 to 1)/2× (0.75 to 2.5)
sleeve
Tightening torque Nm 0.4 to 0.7 0.8 to 1.4
lb. in 4 to 6.5 7 to 12
Rated insulation voltage Ui NC Unequal potential Equal potential
NS1-5329

NS1-5330

NS1-5331
(pollution degree 3) (NO + NC) (NO + NC
connected as
changeover contact)
V 690 400 690

Rated impulse
withstand voltage Uimp kV 6
Switching capacity at AC-15: at DC-13:
Rated operational
voltage Ue V 24 60 125 230 400 500 690 24 60 110 220
Rated operational
current Ie A 2 1.5 1.25 1.15 1.1 1 0.8 2 0.5 0.3 0.2
Conventional thermal
current Ith A 6
Short-circuit protection Fuses LV HRC Type 3NA, DIAZED Type 5SA/5SB, NEOZED Type 5SE: utilization category gL/gG 6 A
Miniature circuit-breaker (C characteristic): 3 A

a -, u -, r -Ratings, main circuit

Rated current A 12 14.5 (25)1) 45 88 63 135 150/180 400 630
Rated voltage AC V 600 600 600 600 600 600 600 600 600

a -, u -, r -Ratings, auxiliary circuit

Rated voltage AC V 600, >150 same polarity
Switching capacity B 600, R 300

Adapter for installing the relay as a single unit

Type 3UX1 418 3UX1 420 3UX1 421 3UX1 424 3UX1 425
For overload relay 3UA50 3UA52 3UA58 3UA60 3UA55
Conductor cross-sections
Terminal screw M 3.5 M4 M6 M6 M5
solid or stranded mm2 1 to 4 2.5 to 10 2.5 to 35 2×25 to 70 1 to 25
finely stranded with end
sleeve mm2 0.75 to 2.5 1.5 to 6 1.5 to 25 2×25 to 50 1 to 16

Trip classes of thermal, delayed Trip class Tripping time tA in seconds

magnetic or solid-state overload relays – A at 7.2 ×Ie from cold state
Excerpt from IEC 947-4 10 2< tA ≤ 10
10 4< tA ≤ 10
20 6< tA ≤ 20
30 9< tA ≤ 30

1) Value in brackets only valid for 3UA52.

3UA Thermally Delayed Overload Relays
CLASS 10
Technical data according to IEC 947-4 and DIN VDE 0660 Part 102
Short circuit protection with fuses for motor feeders with short-circuit currents up to 50 kA at 690 V1), 50/60 Hz
Overload Permissible short-circuit fuses for motor starters Short-circuit protection with circuit
relay consisting of overload relay and contactor, contactor assembly
Type breakers, fuseless motor feeders,
Fuse links combination of devices for mounting
LV HRC Type 3NA LV HRC British u -listed
DIAZED Type 5SB Type 3ND standards fuses onto busbars, see "Circuit breakers"
NEOZED Type 5SE Utilization fuses CLASS and "Fuseless load feeders".
Utilization category category aM BS 88 Type T R K5
gL/gG
Setting Type of coordination2) Type of coordination2) Type of coordination2)
range “1” “2” “2” “1” “2”
A A A A A A A

3UA70 21
0.1 – 0.16 25 0.5 slow3) – 25 – 1
0.16– 0.25 25 13) 25 1
0.25– 0.4 25 1.63) 25 2
0.4 – 0.63 25 2 – 25 2 3
0.63– 1 25 4 25 4 5
0.8 – 1.25 25 4 25 4 6
1 – 1.6 25 6 – 25 6 8
1.25– 2 25 6 25 6 10
1.6 – 2.5 25 6 25 10 12
2 – 3.2 25 10 – 25 10 12
2.5 – 4 25 10 25 10 12
3.2 – 5 25 10 25 10 12
4 – 6.3 25 10 – 25 10 15
5 – 8 25 10 25 10 20
6.3 –10 25 10 25 10 20

3UA50
0.1 – 0.16 35 0.5 slow3) – 25 – 1
0.16– 0.25 35 13) 25 1
0.25– 0.4 35 1.63) 25 2
0.4 – 0.63 35 2 – 25 2 3
0.63– 1 35 4 25 4 5
0.8 – 1.25 35 4 25 4 6
1 – 1.6 35 6 – 25 6 8
1.25– 2 35 6 25 6 10
1.6 – 2.5 35 6 25 10 12
2 – 3.2 35 10 – 25 10 12
2.5 – 4 35 10 25 10 12
3.2 – 5 35 16 25 16 12
4 – 6.3 35 16 – 25 16 15
5 – 8 35 20 25 16 20
6.3 –10 35 25 25 20 20
8 –12.5 35 25 – 25 20 20
10 –14.5 35 25 35 32 20

3UA52
0.1 – 0.16 63 0.5 slow3) – 63 – 1
0.16– 0.25 63 13) 63 1
0.25– 0.4 63 1.63) 63 2
0.4 – 0.63 63 2 – 63 2 3
0.63– 1 63 4 63 4 5
0.8 – 1.25 63 4 63 4 6
1 – 1.6 63 6 – 63 6 8
1.25– 2 63 6 63 6 10
1.6 – 2.5 63 6 63 10 12
2 – 3.2 63 10 – 63 10 12
2.5 – 4 63 10 63 10 12
3.2 – 5 63 16 63 16 12
4 – 6.3 63 16 – 63 16 15
5 – 8 63 20 63 20 20
6.3 –10 63 25 63 20 20
8 –12.5 63 25 16 63 20 30
10 –16 63 25 20 63 25 30
12.5 –20 63 25 20 63 35 30
16 –25 63 25 20 63 35 45

3UA55
1 – 1.6 80 6 – 100 6 8
1.25– 2 80 6 100 6 10 1) Voltage tolerance +5%.
1.6 – 2.5 80 6 100 10 12 2) Coordination of short-circuit equipment
2 – 3.2 80 10 – 100 10 12 according to IEC 947-4/DIN VDE 0660
2.5 – 4 80 10 100 10 12 Part 102:
3.2 – 5 80 16 100 16 15 Type of coordination “1”:
4 – 6.3 80 16 – 100 16 15 The contactor or starter must not endanger
5 – 8 80 20 100 20 20 persons or the installation in the event of a
6.3 –10 80 25 100 25 25 short-circuit. They do not need to be suitable
for further operation without repair and the
8 –12.5 80 25 16 100 20 25 renewal of parts.
10 –16 80 35 20 100 40 40
12.5 –20 80 50 20 100 50 50 Type of coordination “2”:
The contactor or starter must not endanger
16 –25 80 50 40 100 63 60 persons or the installation and must be
20 –32 80 80 50 100 80 60 suitable for further use.There is a danger
25 –36 80 80 50 100 80 60 of contact welding.
32 –40 80 80 50 100 80 60 3) D-fuse links UN = 500 V, make SIBA.
36 –45 80 80 50 100 80 60
3UA Thermally Delayed Overload Relays
CLASS 10
Technical data according to IEC 947-4 and DIN VDE 0660 Part 102
Short-circuit protection with fuses for motor feeders with short-circuit currents up to 50 kA at 690 V1), 50/60 Hz
Overload Permissible short-circuit fuses for motor starters Short-circuit protection with circuit
relay consisting of overload relay and contactor, contactor assembly
Type breakers, fuseless motor feeders,
Fuse links combination of devices for mounting
LV HRC Type 3NA LV HRC British u -listed
DIAZED Type 5SB Type 3ND standards fuses onto busbars, see "Circuit breakers"
NEOZED Type 5SE Utilization category fuses CLASS and "Fuseless load feeders".
Utilization category aM BS 88 Type T R K5
gL/gG
Setting Type of coordination3) Type of coordination3) Type of coordination3)
range “1” “2” “2” “1” “2”
A A A A A A A

3UA58
16 – 25 160 50 25 160 63 60
20 – 32 160 63 35 160 63 70
25 – 40 160 80 40 160 80 70
32 – 50 160 125 50 160 80 70
40 – 57 160 125 63 160 100 70
50 – 63 160 125 63 160 100 100
57 – 70 160 125 63 160 100 125
63 – 80 250 160 80 160 125 150
70 – 88 250 160 100 160 125 175

3UA70 11, 3UA59

0.1 – 0.16 25 0.5 slow4) – 25 – 1
0.16– 0.25 25 14) 25 1
0.25– 0.4 25 1.64) 25 2
0.4 – 0.63 25 2 – 25 2 3
0.63– 1 25 4 25 4 5
0.8 – 1.25 25 4 25 4 6
1 – 1.6 25 6 – 25 6 8
1.25– 2 25 6 25 6 10
1.6 – 2.5 25 6 25 10 12
2 – 3.2 25 10 – 25 10 12
2.5 – 4 25 10 25 10 12
3.2 – 5 25 10 25 16 12
4 – 6.3 25 10 – 25 16 15
5 – 8 25 10 35 16 20
6.3 – 10 25 10 35 20 20
8 – 12.52) 35 16 – 63 32 20
10 – 16 63 25 16 63 32 30
12.5 – 20 63 25 20 63 35 45
16 – 25 63 25 25 80 50 45
20 – 32 80 63 35 80 63 60
25 – 40 125 80 40 160 80 70
32 – 45 160 100 50 160 80 70
40 – 57 160 125 63 160 100 100
50 – 63 160 125 63 160 100 100

3UA60, 3UA61, 3UA62

55 – 80 250 160 80 160 125 150
63 – 90 250 160 100 160 125 150
80 –110 400 200 125 315 160 175
90 –120 400 224 125 315 200 175
110 –135 400 224 160 315 200 175
120 –150 400 250 160 315 200 200
135 –160 400 250 160 355 250 200
150 –180 400 250 200 355 250 200

3UA66, 3UA68
1) Voltage tolerance +5%.
80 –125 355 224 125 355 224 300
2) For 3UA70 11 setting range 8 to 12 A.
125 –200 355 224 200 355 224 300
3) Coordination of short-circuit equipment
160 –250 500 400 250 500 355 300 according to IEC 947-4/DIN VDE 0660
Part 102:
200 –320 500 400 315 500 400 300 Type of coordination “1”:
250 –400 800 500 400 800 450 400 The contactor or starter must not endanger
persons or the installation in the event of a
320 –500 800 500 630 800 500 400 short-circuit. They do not need to be suitable
for further operation without repair and the
400 –630 1000 500 630 1000 500 1200 renewal of parts.
(630)5) CLASS L Type of coordination “2”:
The contactor or starter must not endanger
persons or the installation and must be
suitable for further use.There is a danger
of contact welding.
4) D-fuse links UN = 500 V, make SIBA.
5) Valid for 3TB contactor.