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LT2 Thermal Overload Relays
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Themal Relays
The thermal relays LT2-K/Exx series are devices designed for protection of induction motors from overload or overthear.They are mounted to contactors LT 1 K/Dxx series and an operating circuit for motor control is passed through their NC contacts.The operation of these devices is based on the curving of bimetal plates mounted in the themal relay caused by the current passing through them. When the current to the consumer gets higher due to failure,the thermal current gets higher which leads to additional curvig of the bimetal phates and at getting above the limit value for the plate it pushes the breaking mechanism and breaks the operating circuit.The choice of a suitable protection prevents motor;s operation at unusal temperature conditions and guarantess maximum constant operaion.increases the effectivness and prolongs the tem of exploitaton.
Functions
Switching off afternating current consumers at current overload
making of control systems for consumers
used as a protective operating element in control panels of induction motors
remarkable with high reliability of current characteristics
Technical Data
Rated operating voltage:up to 690V AC:50/60Hz
Rated operating current range:up to 690V AC
insulation voltage:>690V
Joining terminal:screw terminal
Coting:flexible or rigid conductors with or without cable teminal for joining to the consumer to the contactor through the relay terminals the connecting terminals with the consumer can be adjusted according to the type of the contactor
Electrical wear resistance(number of cycles): 1000000
Mechanical wear resistance(number of cycles): 10000000
Indication for protection activating
Possibility for choice of the protecton restoring (through the blue button)
Possibility for range adjustment of the protection activating
Possibility for operation at higher frequency
Mounting:mounting to the contactor:to the terminals of the contactor as it is additonally clammped to its frame through a pin mounting position :vertical gradient-maximum 5
Plastic:wear resistance of UV rays and non-flammable(self-extinguishing material)
Ambient temperature: -10+60
Installation altitude:up to 2000m
Note:To protect the consumer from short circuit,before the combination contactor-thermal relay,a suitably measured breaker or safety device should be mounted.

Type
a(mm)
b(mm)
c(mm)
m(mm)
x(mm)
y(mm)
v(mm)
z(mm)
LT2-Kxx
81
50
0
98
47
92
44
17
LT2-E13xx
86
55
10.7
108
47
92
44
17
LT2-E23xx
86
55
9
109
47
92
44
17
LT2-E33xx
115
76
9.5
124
54
109
70
30


type
Motor capacity(Kw)
Rated current(A)
Protection adjustment range
Package/Box(Pcs)
220V 230V
380V 400V
660V 690V
LT2-K0301
-
-
-
0.16
0.10-0.16
1/100
LT2-K0302
-
-
-
0.25
0.16-0.25
1/100
LT2-K0303
-
-
-
0.40
0.25-0.40
1/100
LT2-K0304
-
-
0.37
0.63
0.40-0.63
1/100
LT2-K0305
-
-
0.55
1
0.63-1.0
1/100
LT2-K0306
-
0.37
1.1
1.6
1.0-1.6
1/100
LT2-K0307
0.37
0.75
1.5
2.5
1.6-2.5
1/100
LT2-K0308
0.75
1.5
3
4
2.5-4
1/100
LT2-K0310
1.1
2.2
4
6
4-6
1/100
LT2-K0312
1.1
2.2
4
8
5.5-8
1/100
LT2-K0314
2.2
4
7.5
10
7-10
1/100
LT2-K0316
3.7
5.5
11
13
9-13
1/100
LT2-K0321
4
7.5
15
18
12-18
1/100
LT2-K0322
5.5
5.5
15
25
17-25
1/100
 
LT2-E1301
-
-
-
0.16
0.10-0.16
1/100
LT2-E1302
-
-
-
0.25
0.16-0.25
1/100
LT2-E1303
-
-
-
0.40
0.25-0.40
1/100
LT2-E1304
-
-
0.37
0.63
0.40-0.63
1/100
LT2-E1305
-
-
0.55
1.0
0.63-1.0
1/100
LT2-E1306
-
0.37
1.1
1.6
1.0-1.6
1/100
LT2-E1307
0.37
0.75
1.5
2.5
1.6-2.5
1/100
LT2-E1308
0.75
1.5
3
4.0
2.5-4.0
1/100
LT2-E1310
1.1
2.2
4
6.0
4.0-6.0
1/100
LT2-E1312
2
3.7
5.5
8.0
5.5-8.0
1/100
LT2-E1314
2.2
4
7.5
10.0
7.0-10.0
1/100
LT2-E1316
3.7
5.5
11
13.0
9.0-13.0
1/100
LT2-E1321
4
7.5
15
18.0
12.0-18.0
1/100
LT2-E1322
5.5
9
18.5
25.0
17.0-25.0
1/100
LT2-E1353
11
11
18.5
33.0
23.0-32.0
1/100
LT2-E2353
11
11
18.5
32
23.0-32.0
1/100
LT2-E2355
15
15
22
36
28.0-36.0
1/100
LT2-E3355
18.5
18.5
30
40
30.0-40.0
1/50
LT2-E3357
22
22
30
50
37.0-50.0
1/50
LT2-E3359
30
30
37
65
48.0-65.0
1/50
LT2-E3363
45
45
55
80
63.0-80.0
1/50
LT2-E3365
55
55
75
93
80.0-93.0
1/50
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