Datasheet [PDF] (10 pages)
- Updated: 12.09.2026
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Thermal Overload Relay J7TKN
55
Thermal Overload Relay
J7TKN
Thermal Overload Relay
• Direct and separate mounting
• Single phasing sensivity according to IEC 947-4-1
• Finger proof (BGV A2)
Accessories
• Busbar sets
• Set for single mounting
)
Approved Standards
Ordering Information
■ Model Number Legend
1. Thermal Overload Relay
1)
Thermal Overload Relay
2)
A:
for mini motor contactor and motor contactor (4-11 kW)
B:
for motor contactor (4-15 kW)
C:
for motor contactor (18.5 kW)
D:
for motor contactor (22-37 kW)
E:
for motor contactor (45-55 kW)
F:
for motor contactor (75-110 kW)
3)
Setting range
2. Accessories for Thermal Overload Relay
1)
Accessories for Thermal Overload Relay
2)
SM:
Single mounting for J7TKN-B Types (4-32 kW)
SU:
Busbar sets
M:
Single Mounting for J7TKN-A Types (4-11 kw)
3)
176:
for J7TKN-F Types (75-90 kW)
200:
for J7TKN-F Types (110 kW)
Standard
Guide No (US,C)
UL
NKCR, NKCR7
IEC 947-4-1
VDE 0660
EN 60947-4-1
J7TKN-#-###
1
2
3
E18:
0.12-0.18 A
E27:
0.18-0.27 A
E4:
0.27-0.4 A
E6:
0.4-0.6 A
E9:
0.6-0.9 A
1E2:
0.8-1.2 A
1E8:
1.2-1.8 A
2E7:
1.8-2.7 A
4:
2.7-4 A
6:
4-6 A
9:
6-9 A
11:
8-11 A
14:
10-14 A
18:
13-18 A
24:
17-24 A
32:
23-32 A
42:
28-42 A
52:
40-52 A
65:
52-65 A
74:
60-74 A
90:
60-90 A
120:
80-120 A
150:
100-150 A
210:
140-220 A
J74TK-##-###
1
2
3
56
Thermal Overload Relay J7TKN
■ System overview
Thermal Overload Relays for plug-in mounting
Setting Range
Type
Pack
Weight
D.O.L.
(A)
Star Delta
(A)
pcs.
kg/pc.
For contactors J7KNA-09..., J7KNA-12...
0.12
-
0.18
-
manual reset
J7TKN-A-E18
1
0.10
0.18
-
0.27
-
J7TKN-A-E27
1
0.10
0.27
-
0.4
-
J7TKN-A-E4
1
0.10
0.4
-
0.6
-
J7TKN-A-E6
1
0.10
0.6
-
0.9
-
J7TKN-A-E9
1
0.10
0.8
-
1.2
-
J7TKN-A-1E2
1
0.10
1.2
-
1.8
-
J7TKN-A-1E8
1
0.10
1.8
-
2.7
-
J7TKN-A-2E7
1
0.10
2.7
-
4
-
J7TKN-A-4
1
0.10
4
-
6
7
-
10.5
J7TKN-A-6
1
0.10
6
-
9
10.5
-
15.5
J7TKN-A-9
1
0.10
8
-
11
14
-
19
J7TKN-A-11
1
0.10
10
-
14
18
-
24
J7TKN-A-14
1
0.10
For contactors J7KN-10... to J7KN-40...
0.12
-
0.18
-
manual and auto reset
J7TKN-B-E18
1
0.14
0.18
-
0.27
-
J7TKN-B-E27
1
0.14
0.27
-
0.4
-
J7TKN-B-E4
1
0.14
0.4
-
0.6
-
J7TKN-B-E6
1
0.14
0.6
-
0.9
-
J7TKN-B-E9
1
0.14
0.8
-
1.2
-
J7TKN-B-1E2
1
0.14
1.2
-
1.8
-
J7TKN-B-1E8
1
0.14
1.8
-
2.7
-
J7TKN-B-2E7
1
0.14
2.7
-
4
-
J7TKN-B-4
1
0.14
4
-
6
7
-
10.5
J7TKN-B-6
1
0.14
6
-
9
10.5
-
15.5
J7TKN-B-9
1
0.14
8
-
11
14
-
19
J7TKN-B-11
1
0.14
10
-
14
18
-
24
J7TKN-B-14
1
0.14
13
-
18
23
-
31
J7TKN-B-18
1
0.14
17
-
24
30
-
41
J7TKN-B-24
1
0.14
23
-
32
40
-
55
J7TKN-B-32
1
0.14
For contactors J7KN-24... to J7KN-40...
28
-
42
48
-
73
manual and auto reset
J7TKN-C-42
1
0.30
For contactors J7KN-50...-J7KN-74...
40
-
52
70
-
90
manual and auto reset
J7TKN-D-52
1
0.40
52
-
65
90
-
112
J7TKN-D-65
1
0.40
60
-
74
104
-
128
J7TKN-D-74
1
0.40
Thermal Overload Relay J7TKN
57
Thermal Overload relays for separate mounting
Accessories
Setting Range
Type
Pack
Weight
D.O.L.
(A)
Star Delta
(A)
pcs.
kg/pc.
For contactors J7KN-85... to J7KN-151...
60
-
90
104
-
156
manual reset
J7TKN-E-90
1
0.90
80
-
120
140
-
207
J7TKN-E-120
1
0.90
For contactors J7KN-176... to J7KN-200...
100
-
150
175
-
260
manual reset
J7TKN-F-150
1
1.5
140
-
220
240
-
380
J7TKN-F-210
1
1.5
busbar sets
see accessories
Type
Pack
Weight
for overload relays
for contactors
pcs.
kg/pc.
Busbar Sets
J7TKN-F-150
J7KN-151, J7KN-176
J74TK-SU-176
1
0.6
J7TKN-F-210
J7KN-200
J74TK-SU-200
1
0.7
busbars must be installed by users
Cable Cross-section to clamp (mm²)
Type
Pack
Weight
for overload relay
solid or stranded
flexible
flex. with multicore
cable end
pcs.
kg/pc.
Sets for single mounting
J7TKN-A
J7TKN-B
0.75
0.75
-
-
6
6
0.75
0.75
-
-
4
4
0.5
0.5
-
-
4
4
J74TK-M
J74TK-SM
1
1
0.035
0.035
58
Thermal Overload Relay J7TKN
Specifications
■ Engineering data and Characteristics
Thermal Overload Relays, tripping times for selection to motors of protection degree EEx e
Relays With Standard Tripping Characteristic
When selecting a standard overload, refer to the tripping curve.
Determine the values of the starting current ratio IA/IN and the time tE
which is marked on the label of the motor. The overload must trip
within the tE time, which means that the tripping curve from cold con-
dition must be (20% due to tolerance) below the coordination point IA/
IN and the time tE.
IA= Starting current of motor
IN = Rated current of motor
tE = tE-time of motor
All tripping times of overload relays J7TKN-A are shorter than the
minimum values of the tE time for motors of protection degree EEx e
acc. to EN 50019 and therefore are suitable for all motors of protec-
tion degree EEx e. For these overload relays the selection on basis
of tripping curves is thereby not necessary.
Labels of tripping curves for each setting range, sized 148x105mm
(self-adhesive) are available on request.
Specify type and setting range.
Setting Range
Tripping time(in seconds) depending on the mul-
tiple of the current setting from cold condition (tol-
erance ±20% of the tripping time)
IA/IN
IA/IN
IA/IN
IA/IN
IA/IN
IA/IN
A
A
3
4
5
6
7,2
8
J7TKN-A-...
0,12
-
0,18
18,5
10,4
7,2
5,5
4,3
3,6
0,18
-
0,27
16,7
9,8
6,5
5
4,1
3,5
0,27
-
0,4
19,4
12,1
8,2
5,9
4,9
4,2
0,4
-
0,6
18,7
11,2
8
6
4,9
4,1
0,6
-
0,9
19,7
11,6
8,1
6,1
4,9
4,2
0,8
-
1,2
22,9
13,6
10
7,3
6
5,2
1,2
-
1,8
22,2
13,2
9,2
7,6
5,8
5,3
1,8
-
2,7
23
13,7
9,3
7,6
5,7
5,1
2,7
-
4
24
14,4
9,9
7,8
5,9
5,1
4
-
6
24,7
13,8
9,9
7,3
5,6
4,8
6
-
9
22
13,4
8
5,7
4,1
3,5
8
-
11
17,4
9,2
5,9
4,1
2,9
2,3
10
-
14
26,4
12,9
7,6
5,2
3,5
2,8
J7TKN-B-...
0,12
-
0,18
16,1
9,6
6,8
5,3
4,2
3,7
0,18
-
0,27
16,6
9,7
6,7
5,2
4,1
3,6
0,27
-
0,4
19,4
11,4
7,9
6,1
4,7
4,2
0,4
-
0,6
18,7
10,9
7,6
5,9
4,6
4,0
0,6
-
0,9
19,2
11,2
7,7
5,9
4,6
4,1
0,8
-
1,2
20,8
12,3
8,5
6,6
5,2
4,6
1,2
-
1,8
25,5
14,1
9,8
7,6
5,9
5,2
1,8
-
2,7
26,6
15,6
10,9
8,3
6,5
5,7
2,7
-
4
22,7
13,6
9,5
7,4
5,8
5,1
4
-
6
22,2
13,3
9,3
7,1
5,6
4,9
6
-
9
20,4
11,9
8,2
6,1
4,7
4,0
8
-
11
20,9
11,8
7,9
5,7
4,3
3,5
10
-
14
21,3
11,7
7,4
5,1
3,7
3,0
13
-
18
21,2
12,1
8,0
6,2
4,6
4,1
17
-
24
20,4
12
8,6
6,3
4,5
3,7
23
-
32
20,2
10,2
6,7
4,7
3,4
2,8
J7TKN-C-42
28
-
42
25,2
13,3
8
5,5
4
3,1
J7TKN-D-...
40
-
52
18,3
9,2
5,6
3,9
2,8
2,2
52
-
65
17,8
8,7
5,2
3,4
2,5
1,9
60
-
74
19,5
13,5
11
10
9,5
8,5
J7TKN-E-...
60
-
90
19,5
13,5
11
10
9,5
8,5
80
-
120
18
11
10
9
8,5
8
J7TKN-F-...
s
s
s
s
s
s
100
-
150
34
26
24
20,5
19
18
140
-
210
30
24
21
18,5
17
16
Typical tripping
curve for overload
relay J7TKN-A
Minimum values of
tE time (motor)
acc. to EN50019
ratio IA/IN
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