Hitachi H20-T User Manual

11
Table 6. Temperature-rise limits for insulated coils in air (IEC 60947-4-1)
Class of insulating material Temperature-rise limit
(measured by resistance variation)
A
E
B
F
H
85 K
100 K
110 K
135 K
160 K
Table 7. Temperature-rise limits for the various materials and parts (IEC 60947-4-1)
Type of material
Description of part
Temperature-rise
limit (measured by
thermocouple)
Contact parts in air (main, control and auxiliary contacts):
- copper uninterrupted duty
eight-hour, intermittent , or temporary duty
- silver or silver-faced
45 K
65 K
1)
Bare conductors including non-insulated coils 1)
Metallic parts acting as springs . 2)
Metallic parts in contact with insulating materials 3)
Terminals for external insulated connections 70 K
1) Limited solely by the necessity of not causing any damage to adjacent parts.
2) The resulting temperature shall not reach a value such that the elasticity of the material is impaired. For pure
copper, this implies a total temperature not exceeding +75℃.
3) Limited solely by the necessity of not causing any damage to insulating materials.
When no current is passed to the main and auxiliary circuits and opening and closing operations in Table 8 corre-
sponding to the intermittent duty class are performed, the temperature rise of the coil shall not exceed the limits
as given in Table 6.
Table 8. Operating condition (IEC 60947-4-1)
Intermittent duty
class of the
contactor
One close-open
operating cycle
every
Interval of time during
which the supply of the
control coil is maintained
0.1
0.3
1
3
10
300 s
120 s
30 s
12 s
3s
180 s
72 s
18 s
4.8 s
1.2 s
The class of insulating material of coils is A or E and contactors satisfy the requirement of Class 10 of Table 8.

Hitachi H20-T Specifications

General

Brand	Hitachi
Model	H20-T
Category	Controller
Language	English