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Contactor selection
Heating
The choice of the contactor depends on the mechanical endurance
(number of operations) and on the electrical heating load
i.e. resistive elements, infra-red element, convectors.
Choice of Contactors
The choice of contactor is dependant upon many parameters
i.e. operating voltage, size of contacts, number of operations,
ambient temperature, type of load supplied etc.
Type of Load
Loads are categorised into various AC ratings, (AC1, AC2, AC3 etc.)
and the higher the AC rating the more inductive the load becomes.
All Hager contactor ratings are given at AC1, therefore they must be
de-rated if used on other types of AC load.
Heat Dissipation Inserts
The ambient temperature around a contactor can affect its life
expectancy, therefore, we strongly recommend that heat
dissipation inserts (LZ060) are fitted between all contactors and
adjacent devices.
U
R R
R
R
R
U
U
U
Single Phase
Three Phase
Motors
Single Phase 230V (AC3 or AC7b)
Three Phase 400V (AC3 or AC7b)
L1
U
V
M
L2
L1
U
W
M
L3
L2
V
Choice of Contactor According to control diagram
Single Phase with Capacitor 230V Three Phase (AC3 or AC7) 400V 2 Wires
3 Wires
Maximum
load in kW
0.88
2 pole 25A
2.6
2 pole 40A
2.6
3 pole 25A
7.8
3 pole 40A
10
3 pole 63A
Requirements of Use
Influence of Working Temperature
Derating factor between 40°C and 50°C : 0.9
Example: Heating with convector
The maximum load of ESC225 is 4.6kW for 50,000 operations and for
a temperature <40°C.
between 40°C and 50°C, the load is 4.6 x 0.9 i.e. 4.14kW
Close Fitting
It is necessary to put a heat dissipation insert (reference LZ060)
between each contactor.
Number of operations
100,000
150,000
200,000
500,000
1,000,000
Max. load in kW
230V
16A
3
2.5
1.9
0.85
0.7
25A
4.6
4
3
1.35
1
40A
7.3
6.3
4.7
2.2
1.6
63A
11.6
10
7.5
3.5
2.5
400V
16A
8.9
8
5.8
2.8
2
25A
13.8
12
8.6
4.3
3
40A
22
18.5
14.385
6.3
5
63A
35
30
22.6
10.2
7.6
Modular
Devices